updated Random() to SecureRandom() (#1670 )

* updated Random() to SecureRandom() * batch 2 of SecureRandom updates
Update to JUnit5 across all modules (#1668 )
2021-03-06 13:26:02 +02:00 · 2021-03-06 14:42:46 +05:30 · 2021-03-05 19:51:09 +02:00 · 2021-03-04 10:49:31 +05:30 · 2021-03-01 16:50:34 +02:00 · 2021-03-01 19:20:06 +05:30
103 changed files with 2007 additions and 628 deletions
--- a/.all-contributorsrc
+++ b/.all-contributorsrc
@ -1404,6 +1404,15 @@
      "contributions": [
        "translation"
      ]
+    },
+    {
+      "login": "richardmr36",
+      "name": "Martel Richard",
+      "avatar_url": "https://avatars.githubusercontent.com/u/19147333?v=4",
+      "profile": "https://github.com/richardmr36",
+      "contributions": [
+        "code"
+      ]
    }
  ],
  "contributorsPerLine": 4,
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@ -0,0 +1,52 @@
+#
+# The MIT License
+# Copyright © 2014-2021 Ilkka Seppälä
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+#
+
+version: 2
+
+jobs:
+  sonar-pr:
+    docker:
+      - image: circleci/openjdk:11-node
+    steps:
+    - checkout
+    - restore_cache:
+        key: jdp-sonar-pr-{{ checksum "pom.xml" }}
+    - run: |
+        if [ -n "${CIRCLE_PR_NUMBER}" ]; then
+          MAVEN_OPTS="-Xmx3000m" xvfb-run ./mvnw -B clean verify org.sonarsource.scanner.maven:sonar-maven-plugin:sonar \
+             -Dsonar.pullrequest.key=${CIRCLE_PR_NUMBER} \
+             -Dsonar.pullrequest.branch=${CIRCLE_BRANCH} \
+             -Dsonar.pullrequest.base=master
+        else
+          echo "No Sonar PR analysis as this is not a pull request"
+        fi
+    - save_cache:
+        key: jdp-sonar-pr-{{ checksum "pom.xml" }}
+        paths:
+        - ~/.m2
+
+workflows:
+  version: 2
+  all:
+    jobs:
+    - sonar-pr
--- a/.github/workflows/maven-ci.yml
+++ b/.github/workflows/maven-ci.yml
@ -40,25 +40,25 @@ jobs:
    steps:

    - name: Checkout Code
-      uses: actions/checkout@v2
+      uses: actions/checkout@master
      with:
        # Disabling shallow clone for improving relevancy of SonarQube reporting
        fetch-depth: 0

    - name: Set up JDK 11
-      uses: actions/setup-java@v1
+      uses: actions/setup-java@master
      with:
        java-version: 11

    - name: Cache SonarCloud packages
-      uses: actions/cache@v2
+      uses: actions/cache@master
      with:
        path: ~/.sonar/cache
        key: ${{ runner.os }}-sonar
        restore-keys: ${{ runner.os }}-sonar

    - name: Cache Maven dependencies
-      uses: actions/cache@v2
+      uses: actions/cache@master
      with:
        path: ~/.m2/repository
        key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
@ -69,11 +69,8 @@ jobs:
    - name: Install xvfb
      run: sudo apt-get install -y xvfb

-    # The SonarQube analysis is only for the master branch of the main repository.
-    # SonarQube scan does not work for forked repositories try changing it to xvfb-run mvn clean verify
-    # See https://jira.sonarsource.com/browse/MMF-1371
    - name: Build with Maven and run SonarQube analysis
-      run: xvfb-run mvn clean verify org.sonarsource.scanner.maven:sonar-maven-plugin:sonar
+      run: xvfb-run ./mvnw clean verify org.sonarsource.scanner.maven:sonar-maven-plugin:sonar
      env:
        # These two env variables are needed for sonar analysis
        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
--- a/.github/workflows/maven-pr-builder.yml
+++ b/.github/workflows/maven-pr-builder.yml
@ -29,7 +29,7 @@ name: Java PR Builder
 on:
  pull_request:
    branches: [ master ]
-    types: [ opened, reopened, synchronize, labeled, unlabeled ]
+    types: [ opened, reopened, synchronize ]

 jobs:
  build:
@ -38,15 +38,15 @@ jobs:

    steps:
    - name: Checkout Code
-      uses: actions/checkout@v2
+      uses: actions/checkout@master
    
    - name: Set up JDK 11
-      uses: actions/setup-java@v1
+      uses: actions/setup-java@master
      with:
        java-version: 11
    
    - name: Cache Maven Dependecies
-      uses: actions/cache@v2
+      uses: actions/cache@master
      with:
        path: ~/.m2/repository
        key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
@ -57,8 +57,5 @@ jobs:
    - name: Install xvfb
      run: sudo apt-get install -y xvfb
    
-    # This worflow is only for building Pull Requests, the master branch runs Sonar analysis on the main repository.
-    # SonarQube scan does not work for forked repositories.
-    # See https://jira.sonarsource.com/browse/MMF-1371
    - name: Build with Maven
-      run: xvfb-run mvn clean verify
+      run: xvfb-run ./mvnw clean verify
--- a/.mvn/wrapper/MavenWrapperDownloader.java
+++ b/.mvn/wrapper/MavenWrapperDownloader.java
@ -0,0 +1,125 @@
+/*
+ * The MIT License
+ * Copyright © 2014-2021 Ilkka Seppälä
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+import java.net.*;
+import java.io.*;
+import java.nio.channels.*;
+import java.util.Properties;
+
+public class MavenWrapperDownloader {
+
+    private static final String WRAPPER_VERSION = "0.5.6";
+    /**
+     * Default URL to download the maven-wrapper.jar from, if no 'downloadUrl' is provided.
+     */
+    private static final String DEFAULT_DOWNLOAD_URL = "https://repo.maven.apache.org/maven2/io/takari/maven-wrapper/"
+        + WRAPPER_VERSION + "/maven-wrapper-" + WRAPPER_VERSION + ".jar";
+
+    /**
+     * Path to the maven-wrapper.properties file, which might contain a downloadUrl property to
+     * use instead of the default one.
+     */
+    private static final String MAVEN_WRAPPER_PROPERTIES_PATH =
+            ".mvn/wrapper/maven-wrapper.properties";
+
+    /**
+     * Path where the maven-wrapper.jar will be saved to.
+     */
+    private static final String MAVEN_WRAPPER_JAR_PATH =
+            ".mvn/wrapper/maven-wrapper.jar";
+
+    /**
+     * Name of the property which should be used to override the default download url for the wrapper.
+     */
+    private static final String PROPERTY_NAME_WRAPPER_URL = "wrapperUrl";
+
+    public static void main(String args[]) {
+        System.out.println("- Downloader started");
+        File baseDirectory = new File(args[0]);
+        System.out.println("- Using base directory: " + baseDirectory.getAbsolutePath());
+
+        // If the maven-wrapper.properties exists, read it and check if it contains a custom
+        // wrapperUrl parameter.
+        File mavenWrapperPropertyFile = new File(baseDirectory, MAVEN_WRAPPER_PROPERTIES_PATH);
+        String url = DEFAULT_DOWNLOAD_URL;
+        if(mavenWrapperPropertyFile.exists()) {
+            FileInputStream mavenWrapperPropertyFileInputStream = null;
+            try {
+                mavenWrapperPropertyFileInputStream = new FileInputStream(mavenWrapperPropertyFile);
+                Properties mavenWrapperProperties = new Properties();
+                mavenWrapperProperties.load(mavenWrapperPropertyFileInputStream);
+                url = mavenWrapperProperties.getProperty(PROPERTY_NAME_WRAPPER_URL, url);
+            } catch (IOException e) {
+                System.out.println("- ERROR loading '" + MAVEN_WRAPPER_PROPERTIES_PATH + "'");
+            } finally {
+                try {
+                    if(mavenWrapperPropertyFileInputStream != null) {
+                        mavenWrapperPropertyFileInputStream.close();
+                    }
+                } catch (IOException e) {
+                    // Ignore ...
+                }
+            }
+        }
+        System.out.println("- Downloading from: " + url);
+
+        File outputFile = new File(baseDirectory.getAbsolutePath(), MAVEN_WRAPPER_JAR_PATH);
+        if(!outputFile.getParentFile().exists()) {
+            if(!outputFile.getParentFile().mkdirs()) {
+                System.out.println(
+                        "- ERROR creating output directory '" + outputFile.getParentFile().getAbsolutePath() + "'");
+            }
+        }
+        System.out.println("- Downloading to: " + outputFile.getAbsolutePath());
+        try {
+            downloadFileFromURL(url, outputFile);
+            System.out.println("Done");
+            System.exit(0);
+        } catch (Throwable e) {
+            System.out.println("- Error downloading");
+            e.printStackTrace();
+            System.exit(1);
+        }
+    }
+
+    private static void downloadFileFromURL(String urlString, File destination) throws Exception {
+        if (System.getenv("MVNW_USERNAME") != null && System.getenv("MVNW_PASSWORD") != null) {
+            String username = System.getenv("MVNW_USERNAME");
+            char[] password = System.getenv("MVNW_PASSWORD").toCharArray();
+            Authenticator.setDefault(new Authenticator() {
+                @Override
+                protected PasswordAuthentication getPasswordAuthentication() {
+                    return new PasswordAuthentication(username, password);
+                }
+            });
+        }
+        URL website = new URL(urlString);
+        ReadableByteChannel rbc;
+        rbc = Channels.newChannel(website.openStream());
+        FileOutputStream fos = new FileOutputStream(destination);
+        fos.getChannel().transferFrom(rbc, 0, Long.MAX_VALUE);
+        fos.close();
+        rbc.close();
+    }
+
+}
--- a/.mvn/wrapper/maven-wrapper.properties
+++ b/.mvn/wrapper/maven-wrapper.properties
@ -0,0 +1,25 @@
+#
+# The MIT License
+# Copyright © 2014-2021 Ilkka Seppälä
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+#
+
+distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.6.3/apache-maven-3.6.3-bin.zip
+wrapperUrl=https://repo.maven.apache.org/maven2/io/takari/maven-wrapper/0.5.6/maven-wrapper-0.5.6.jar
--- a/README.md
+++ b/README.md
@ -4,18 +4,18 @@

 # Design patterns implemented in Java

-![Java CI with Maven](https://github.com/iluwatar/java-design-patterns/workflows/Java%20CI%20with%20Maven/badge.svg)
+![Java CI](https://github.com/iluwatar/java-design-patterns/workflows/Java%20CI/badge.svg)
 [![License MIT](https://img.shields.io/badge/license-MIT-blue.svg)](https://raw.githubusercontent.com/iluwatar/java-design-patterns/master/LICENSE.md)
 [![Lines of Code](https://sonarcloud.io/api/project_badges/measure?project=iluwatar_java-design-patterns&metric=ncloc)](https://sonarcloud.io/dashboard?id=iluwatar_java-design-patterns) 
 [![Coverage](https://sonarcloud.io/api/project_badges/measure?project=iluwatar_java-design-patterns&metric=coverage)](https://sonarcloud.io/dashboard?id=iluwatar_java-design-patterns)
 [![Join the chat at https://gitter.im/iluwatar/java-design-patterns](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/iluwatar/java-design-patterns?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 <!-- ALL-CONTRIBUTORS-BADGE:START - Do not remove or modify this section -->
-[![All Contributors](https://img.shields.io/badge/all_contributors-154-orange.svg?style=flat-square)](#contributors-)
+[![All Contributors](https://img.shields.io/badge/all_contributors-155-orange.svg?style=flat-square)](#contributors-)
 <!-- ALL-CONTRIBUTORS-BADGE:END -->

 <br/>

-Read in different language : [![CN](/assets/flags/CN.png)**CN**](/zh/README.md),[![KR](/assets/flags/KR.png)**KR**](/ko/README.md),[![FR](/assets/flags/FR.png)**FR**](/fr/README.md),[![TR](/assets/flags/TR.png)**TR**](/tr/README.md),[![AR](/assets/flags/AR.png)**AR**](/ar/README.md),
+Read in different language : [![CN](/assets/flags/CN.png)**CN**](/zh/README.md), [![KR](/assets/flags/KR.png)**KR**](/ko/README.md), [![FR](/assets/flags/FR.png)**FR**](/fr/README.md), [![TR](/assets/flags/TR.png)**TR**](/tr/README.md), [![AR](/assets/flags/AR.png)**AR**](/ar/README.md)

 <br/>

@ -306,6 +306,7 @@ This project is licensed under the terms of the MIT license.
  <tr>
    <td align="center"><a href="https://github.com/byoungju94"><img src="https://avatars.githubusercontent.com/u/42516378?v=4?s=100" width="100px;" alt=""/><br /><sub><b>byoungju94</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=byoungju94" title="Code">💻</a></td>
    <td align="center"><a href="https://github.com/moustafafarhat"><img src="https://avatars.githubusercontent.com/u/38836727?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Moustafa Farhat</b></sub></a><br /><a href="#translation-moustafafarhat" title="Translation">🌍</a></td>
+    <td align="center"><a href="https://github.com/richardmr36"><img src="https://avatars.githubusercontent.com/u/19147333?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Martel Richard</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=richardmr36" title="Code">💻</a></td>
  </tr>
 </table>

--- a/arrange-act-assert/pom.xml
+++ b/arrange-act-assert/pom.xml
@ -36,8 +36,8 @@
  <artifactId>arrange-act-assert</artifactId>
  <dependencies>
    <dependency>
-      <groupId>junit</groupId>
-      <artifactId>junit</artifactId>
+      <groupId>org.junit.jupiter</groupId>
+      <artifactId>junit-jupiter-engine</artifactId>
      <scope>test</scope>
    </dependency>
  </dependencies>
--- a/arrange-act-assert/src/test/java/com/iluwatar/arrangeactassert/CashAAATest.java
+++ b/arrange-act-assert/src/test/java/com/iluwatar/arrangeactassert/CashAAATest.java
@ -23,11 +23,11 @@

 package com.iluwatar.arrangeactassert;

-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertFalse;
-import static org.junit.Assert.assertTrue;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;

-import org.junit.Test;
+import org.junit.jupiter.api.Test;

 /**
 * Arrange/Act/Assert (AAA) is a pattern for organizing unit tests. It is a way to structure your
@ -51,10 +51,11 @@ import org.junit.Test;
 * change and one reason to fail. In a large and complicated code base, tests that honor the single
 * responsibility principle are much easier to troubleshoot.
 */
-public class CashAAATest {
+
+class CashAAATest {

  @Test
-  public void testPlus() {
+  void testPlus() {
    //Arrange
    var cash = new Cash(3);
    //Act
@ -64,7 +65,7 @@ public class CashAAATest {
  }

  @Test
-  public void testMinus() {
+  void testMinus() {
    //Arrange
    var cash = new Cash(8);
    //Act
@ -75,7 +76,7 @@ public class CashAAATest {
  }

  @Test
-  public void testInsufficientMinus() {
+  void testInsufficientMinus() {
    //Arrange
    var cash = new Cash(1);
    //Act
@ -86,7 +87,7 @@ public class CashAAATest {
  }

  @Test
-  public void testUpdate() {
+  void testUpdate() {
    //Arrange
    var cash = new Cash(5);
    //Act
--- a/arrange-act-assert/src/test/java/com/iluwatar/arrangeactassert/CashAntiAAATest.java
+++ b/arrange-act-assert/src/test/java/com/iluwatar/arrangeactassert/CashAntiAAATest.java
@ -23,23 +23,24 @@

 package com.iluwatar.arrangeactassert;

-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertFalse;
-import static org.junit.Assert.assertTrue;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;

-import org.junit.Test;
+import org.junit.jupiter.api.Test;

 /**
 * ({@link CashAAATest}) is an anti-example of AAA pattern. This test is functionally correct, but
- * with the addition of new feature, it needs refactoring. There are an awful lot of steps in that
+ * with the addition of a new feature, it needs refactoring. There are an awful lot of steps in that
 * test method, but it verifies the class' important behavior in just eleven lines. It violates the
 * single responsibility principle. If this test method failed after a small code change, it might
 * take some digging to discover why.
 */
-public class CashAntiAAATest {
+
+class CashAntiAAATest {

  @Test
-  public void testCash() {
+  void testCash() {
    //initialize
    var cash = new Cash(3);
    //test plus
--- a/async-method-invocation/pom.xml
+++ b/async-method-invocation/pom.xml
@ -45,11 +45,6 @@
 			<artifactId>mockito-core</artifactId>
 			<scope>test</scope>
 		</dependency>
-		<dependency>
-			<groupId>junit</groupId>
-			<artifactId>junit</artifactId>
-			<scope>test</scope>
-		</dependency>
 	</dependencies>
 	<build>
 		<plugins>
--- a/cloud-static-content-hosting/README.md
+++ b/cloud-static-content-hosting/README.md
@ -55,13 +55,13 @@ the content globally.

 4. Create IAM user that has only the necessary rights for this application.

-* Click `Users`
-* Click `Add user`. Choose `User name` as you wish and `Access type` should be `Programmatic access`. Click `Next: Permissions`.
-* Choose `Attach existing policies directly`. Select `AmazonS3FullAccess` and `CloudFrontFullAccess`. Click `Next: Tags`.
-* No tags are necessarily needed, so just click `Next: Review`.
-* Review the presented information and if all seems good click `Create user`.
-* You are presented with `Access key ID` and `Secret access key` which you will need to complete this example, so store them safely.
-* Click `Close`.
+   * Click `Users`
+   * Click `Add user`. Choose `User name` as you wish and `Access type` should be `Programmatic access`. Click `Next: Permissions`.
+   * Choose `Attach existing policies directly`. Select `AmazonS3FullAccess` and `CloudFrontFullAccess`. Click `Next: Tags`.
+   * No tags are necessarily needed, so just click `Next: Review`.
+   * Review the presented information and if all seems good click `Create user`.
+   * You are presented with `Access key ID` and `Secret access key` which you will need to complete this example, so store them safely.
+   * Click `Close`.

 5. [Install AWS Command Line Interface (AWS CLI)](https://docs.aws.amazon.com/cli/latest/userguide/install-cliv1.html) to gain programmic access to AWS cloud.

@ -69,83 +69,60 @@ the content globally.

 7. Create AWS S3 bucket for the web site content. Note that the S3 bucket names must be globally unique.

-* The syntax is `aws s3 mb <bucket name>` as described in the [instructions](https://docs.aws.amazon.com/cli/latest/userguide/cli-services-s3-commands.html#using-s3-commands-managing-buckets-creating)
-* For example `aws s3 mb s3://my-static-website-jh34jsjmg`
-* Verify that the bucket was successfully created with command `aws s3 ls` which list the existing buckets
+   * The syntax is `aws s3 mb <bucket name>` as described in the [instructions](https://docs.aws.amazon.com/cli/latest/userguide/cli-services-s3-commands.html#using-s3-commands-managing-buckets-creating)
+   * For example `aws s3 mb s3://my-static-website-jh34jsjmg`
+   * Verify that the bucket was successfully created with command `aws s3 ls` which list the existing buckets

 8. Configure the bucket as a web site with command `aws s3 website` as described in the [instructions](https://docs.aws.amazon.com/cli/latest/reference/s3/website.html).

-* E.g. `aws s3 website s3://my-static-website-jh34jsjmg --index-document index.html --error-document error.html`
+   * E.g. `aws s3 website s3://my-static-website-jh34jsjmg --index-document index.html --error-document error.html`

 9. Upload content to the bucket.

-* First create the content, at least `index.html` and `error.html` documents.
-  
-index.html
-```html
-<!doctype html>
-<head>
-    <title>My Static Web Site</title>
-</head>
-<body>
-    <h1>I'm the index.html</h1>
-</body>
-```
-
-error.html
-```html
-<!doctype html>
-<head>
-    <title>My Static Web Site</title>
-</head>
-<body>
-    <h1>I'm the index.html</h1>
-</body>
-```
-
-* Upload the content to your bucket as described [here](https://docs.aws.amazon.com/cli/latest/userguide/cli-services-s3-commands.html#using-s3-commands-managing-objects-copy)
-* E.g. `aws s3 cp index.html s3://my-static-website-jh34jsjmg` and `aws s3 cp error.html s3://my-static-website-jh34jsjmg`
+   * First create the content, at least `index.html` and `error.html` documents.
+   * Upload the content to your bucket as described [here](https://docs.aws.amazon.com/cli/latest/userguide/cli-services-s3-commands.html#using-s3-commands-managing-objects-copy)
+   * E.g. `aws s3 cp index.html s3://my-static-website-jh34jsjmg` and `aws s3 cp error.html s3://my-static-website-jh34jsjmg`

 10. Next we need to set the bucket policy to allow read access.

-* Create `policy.json` with the following contents (note that you need to replace the bucket name with your own).
+    * Create `policy.json` with the following contents (note that you need to replace the bucket name with your own).

-```json
-{
-    "Version": "2012-10-17",
-    "Statement": [
-        {
-            "Sid": "PublicReadGetObject",
-            "Effect": "Allow",
-            "Principal": "*",
-            "Action": "s3:GetObject",
-            "Resource": "arn:aws:s3:::my-static-website-jh34jsjmg/*"
-        }
-    ]
-}
-```
+    ```json
+    {
+        "Version": "2012-10-17",
+        "Statement": [
+            {
+                "Sid": "PublicReadGetObject",
+                "Effect": "Allow",
+                "Principal": "*",
+                "Action": "s3:GetObject",
+                "Resource": "arn:aws:s3:::my-static-website-jh34jsjmg/*"
+            }
+        ]
+    }
+    ```

-* Set the bucket policy according to these [instructions](https://docs.aws.amazon.com/cli/latest/reference/s3api/put-bucket-policy.html)
-* E.g. `aws s3api put-bucket-policy --bucket my-static-website-jh34jsjmg --policy file://policy.json`
+    * Set the bucket policy according to these [instructions](https://docs.aws.amazon.com/cli/latest/reference/s3api/put-bucket-policy.html)
+    * E.g. `aws s3api put-bucket-policy --bucket my-static-website-jh34jsjmg --policy file://policy.json`

 11. Test the web site in your browser.

-* The web site URL format is `http://<bucket-name>.s3-website-<region-name>.amazonaws.com`
-* E.g. this web site was created in `eu-west-1` region with name `my-static-website-jh34jsjmg` so it can be accessed via url `http://my-static-website-jh34jsjmg.s3-website-eu-west-1.amazonaws.com`
+    * The web site URL format is `http://<bucket-name>.s3-website-<region-name>.amazonaws.com`
+    * E.g. this web site was created in `eu-west-1` region with name `my-static-website-jh34jsjmg` so it can be accessed via url `http://my-static-website-jh34jsjmg.s3-website-eu-west-1.amazonaws.com`

 12. Create CloudFormation distribution for the web site.

-* The syntax is described in [this reference](https://docs.aws.amazon.com/cli/latest/reference/cloudfront/create-distribution.html)
-* E.g. the easiest way is to call `aws cloudfront create-distribution --origin-domain-name my-static-website-jh34jsjmg.s3.amazonaws.com --default-root-object index.html`
-* There's also JSON syntax e.g. `--distribution-config file://dist-config.json` to pass distribution configuration arguments in file
-* The output of the call will show you the exact distribution settings including the generated CloudFront domain name you can use for testing e.g. `d2k3xwnaqa8nqx.cloudfront.net` 
-* CloudFormation distribution deployment takes some time, but once it's completed your web site is served from data centers all around the globe!
+    * The syntax is described in [this reference](https://docs.aws.amazon.com/cli/latest/reference/cloudfront/create-distribution.html)
+    * E.g. the easiest way is to call `aws cloudfront create-distribution --origin-domain-name my-static-website-jh34jsjmg.s3.amazonaws.com --default-root-object index.html`
+    * There's also JSON syntax e.g. `--distribution-config file://dist-config.json` to pass distribution configuration arguments in file
+    * The output of the call will show you the exact distribution settings including the generated CloudFront domain name you can use for testing e.g. `d2k3xwnaqa8nqx.cloudfront.net` 
+    * CloudFormation distribution deployment takes some time, but once it's completed your web site is served from data centers all around the globe!

 13. That's it! You have implemented a static web site with content distribution network serving it lightning fast all around the world.

-* To update the web site you need to update the objects in S3 bucket and invalidate the objects in the CloudFront distribution
-* To do it from AWS CLI see [this reference](https://docs.aws.amazon.com/cli/latest/reference/cloudfront/create-invalidation.html)
-* Some further development you might want to do is serve the content over https and add a domain name for your site
+    * To update the web site you need to update the objects in S3 bucket and invalidate the objects in the CloudFront distribution
+    * To do it from AWS CLI see [this reference](https://docs.aws.amazon.com/cli/latest/reference/cloudfront/create-invalidation.html)
+    * Some further development you might want to do is serve the content over https and add a domain name for your site

 ## Applicability

--- a/combinator/pom.xml
+++ b/combinator/pom.xml
@ -34,12 +34,6 @@

  <artifactId>combinator</artifactId>
  <dependencies>
-    <dependency>
-      <groupId>junit</groupId>
-      <artifactId>junit</artifactId>
-      <scope>test</scope>
-    </dependency>
-
    <dependency>
      <groupId>org.junit.jupiter</groupId>
      <artifactId>junit-jupiter-engine</artifactId>
--- a/combinator/src/test/java/com/iluwatar/combinator/CombinatorAppTest.java
+++ b/combinator/src/test/java/com/iluwatar/combinator/CombinatorAppTest.java
@ -23,11 +23,11 @@

 package com.iluwatar.combinator;

-import org.junit.Test;
-
 import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;

-public class CombinatorAppTest {
+import org.junit.jupiter.api.Test;
+
+class CombinatorAppTest {

  /**
   * Issue: Add at least one assertion to this test case.
@ -37,7 +37,7 @@ public class CombinatorAppTest {
   */

  @Test
-  public void shouldExecuteApplicationWithoutException() {
+  void shouldExecuteApplicationWithoutException() {
    assertDoesNotThrow(() -> CombinatorApp.main(new String[]{}));
  }
-}
+}
--- a/combinator/src/test/java/com/iluwatar/combinator/FinderTest.java
+++ b/combinator/src/test/java/com/iluwatar/combinator/FinderTest.java
@ -23,22 +23,19 @@

 package com.iluwatar.combinator;

-import org.junit.Assert;
-import org.junit.Test;
+import static org.junit.jupiter.api.Assertions.assertEquals;

-import java.util.List;
+import org.junit.jupiter.api.Test;

-import static org.junit.Assert.*;
-
-public class FinderTest {
+class FinderTest {

  @Test
-  public void contains() {
+  void contains() {
    var example = "the first one \nthe second one \n";

    var result = Finder.contains("second").find(example);
-    Assert.assertEquals(result.size(),1);
-    Assert.assertEquals(result.get(0),"the second one ");
+    assertEquals(1, result.size());
+    assertEquals("the second one ", result.get(0));
  }

-}
+}
--- a/combinator/src/test/java/com/iluwatar/combinator/FindersTest.java
+++ b/combinator/src/test/java/com/iluwatar/combinator/FindersTest.java
@ -23,44 +23,44 @@

 package com.iluwatar.combinator;

-import org.junit.Assert;
-import org.junit.Test;
+import static com.iluwatar.combinator.Finders.advancedFinder;
+import static com.iluwatar.combinator.Finders.expandedFinder;
+import static com.iluwatar.combinator.Finders.filteredFinder;
+import static com.iluwatar.combinator.Finders.specializedFinder;
+import static org.junit.jupiter.api.Assertions.assertEquals;

-import java.util.List;
+import org.junit.jupiter.api.Test;

-import static com.iluwatar.combinator.Finders.*;
-import static org.junit.Assert.*;
-
-public class FindersTest {
+class FindersTest {

  @Test
-  public void advancedFinderTest() {
+  void advancedFinderTest() {
    var res = advancedFinder("it was","kingdom","sea").find(text());
-    Assert.assertEquals(res.size(),1);
-    Assert.assertEquals(res.get(0),"It was many and many a year ago,");
+    assertEquals(1, res.size());
+    assertEquals("It was many and many a year ago,", res.get(0));
  }

  @Test
-  public void filteredFinderTest() {
+  void filteredFinderTest() {
    var res = filteredFinder(" was ", "many", "child").find(text());
-    Assert.assertEquals(res.size(),1);
-    Assert.assertEquals(res.get(0),"But we loved with a love that was more than love-");
+    assertEquals(1, res.size());
+    assertEquals("But we loved with a love that was more than love-", res.get(0));
  }

  @Test
-  public void specializedFinderTest() {
+  void specializedFinderTest() {
    var res = specializedFinder("love","heaven").find(text());
-    Assert.assertEquals(res.size(),1);
-    Assert.assertEquals(res.get(0),"With a love that the winged seraphs of heaven");
+    assertEquals(1, res.size());
+    assertEquals("With a love that the winged seraphs of heaven", res.get(0));
  }

  @Test
-  public void expandedFinderTest() {
+  void expandedFinderTest() {
    var res = expandedFinder("It was","kingdom").find(text());
-    Assert.assertEquals(res.size(),3);
-    Assert.assertEquals(res.get(0),"It was many and many a year ago,");
-    Assert.assertEquals(res.get(1),"In a kingdom by the sea,");
-    Assert.assertEquals(res.get(2),"In this kingdom by the sea;");
+    assertEquals(3, res.size());
+    assertEquals("It was many and many a year ago,", res.get(0));
+    assertEquals("In a kingdom by the sea,", res.get(1));
+    assertEquals("In this kingdom by the sea;", res.get(2));
  }


@ -80,4 +80,4 @@ public class FindersTest {
            + "Coveted her and me.";
  }

-}
+}
--- a/commander/src/main/java/com/iluwatar/commander/Order.java
+++ b/commander/src/main/java/com/iluwatar/commander/Order.java
@ -23,8 +23,8 @@

 package com.iluwatar.commander;

+import java.security.SecureRandom;
 import java.util.Hashtable;
-import java.util.Random;

 /**
 * Order class holds details of the order.
@ -45,7 +45,7 @@ public class Order { //can store all transactions ids also
  public final String id;
  final float price;
  final long createdTime;
-  private static final Random RANDOM = new Random();
+  private static final SecureRandom RANDOM = new SecureRandom();
  private static final String ALL_CHARS = "ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890";
  private static final Hashtable<String, Boolean> USED_IDS = new Hashtable<String, Boolean>();
  PaymentStatus paid;
--- a/commander/src/main/java/com/iluwatar/commander/Retry.java
+++ b/commander/src/main/java/com/iluwatar/commander/Retry.java
@ -23,10 +23,10 @@

 package com.iluwatar.commander;

+import java.security.SecureRandom;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
-import java.util.Random;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.function.Predicate;

@ -56,7 +56,7 @@ public class Retry<T> {
    void handleIssue(T obj, Exception e);
  }

-  private static final Random RANDOM = new Random();
+  private static final SecureRandom RANDOM = new SecureRandom();

  private final Operation op;
  private final HandleErrorIssue<T> handleError;
--- a/commander/src/main/java/com/iluwatar/commander/Service.java
+++ b/commander/src/main/java/com/iluwatar/commander/Service.java
@ -24,10 +24,11 @@
 package com.iluwatar.commander;

 import com.iluwatar.commander.exceptions.DatabaseUnavailableException;
+
+import java.security.SecureRandom;
 import java.util.ArrayList;
 import java.util.Hashtable;
 import java.util.List;
-import java.util.Random;

 /**
 * Service class is an abstract class extended by all services in this example. They all have a
@ -42,7 +43,7 @@ public abstract class Service {

  protected final Database database;
  public ArrayList<Exception> exceptionsList;
-  private static final Random RANDOM = new Random();
+  private static final SecureRandom RANDOM = new SecureRandom();
  private static final String ALL_CHARS = "ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890";
  private static final Hashtable<String, Boolean> USED_IDS = new Hashtable<>();

--- a/double-buffer/pom.xml
+++ b/double-buffer/pom.xml
@ -36,10 +36,6 @@
    <artifactId>double-buffer</artifactId>

    <dependencies>
-        <dependency>
-            <groupId>junit</groupId>
-            <artifactId>junit</artifactId>
-        </dependency>
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
--- a/double-buffer/src/test/java/com/iluwatar/doublebuffer/AppTest.java
+++ b/double-buffer/src/test/java/com/iluwatar/doublebuffer/AppTest.java
@ -23,14 +23,14 @@

 package com.iluwatar.doublebuffer;

-import org.junit.Test;
-
 import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;

+import org.junit.jupiter.api.Test;
+
 /**
 * App unit test.
 */
-public class AppTest {
+class AppTest {

  /**
   * Issue: Add at least one assertion to this test case.
@ -40,7 +40,7 @@ public class AppTest {
   */

  @Test
-  public void shouldExecuteApplicationWithoutException() {
+  void shouldExecuteApplicationWithoutException() {
    assertDoesNotThrow(() -> App.main(new String[]{}));
  }

--- a/double-buffer/src/test/java/com/iluwatar/doublebuffer/FrameBufferTest.java
+++ b/double-buffer/src/test/java/com/iluwatar/doublebuffer/FrameBufferTest.java
@ -23,17 +23,19 @@

 package com.iluwatar.doublebuffer;

+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.fail;
+
 import java.util.Arrays;
-import org.junit.Assert;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;

 /**
 * FrameBuffer unit test.
 */
-public class FrameBufferTest {
+class FrameBufferTest {

  @Test
-  public void testClearAll() {
+  void testClearAll() {
    try {
      var field = FrameBuffer.class.getDeclaredField("pixels");
      var pixels = new Pixel[FrameBuffer.HEIGHT * FrameBuffer.WIDTH];
@ -43,14 +45,14 @@ public class FrameBufferTest {
      field.setAccessible(true);
      field.set(frameBuffer, pixels);
      frameBuffer.clearAll();
-      Assert.assertEquals(Pixel.WHITE, frameBuffer.getPixels()[0]);
+      assertEquals(Pixel.WHITE, frameBuffer.getPixels()[0]);
    } catch (NoSuchFieldException | IllegalAccessException e) {
-      Assert.fail("Fail to modify field access.");
+      fail("Fail to modify field access.");
    }
  }

  @Test
-  public void testClear() {
+  void testClear() {
    try {
      var field = FrameBuffer.class.getDeclaredField("pixels");
      var pixels = new Pixel[FrameBuffer.HEIGHT * FrameBuffer.WIDTH];
@ -60,21 +62,21 @@ public class FrameBufferTest {
      field.setAccessible(true);
      field.set(frameBuffer, pixels);
      frameBuffer.clear(0, 0);
-      Assert.assertEquals(Pixel.WHITE, frameBuffer.getPixels()[0]);
+      assertEquals(Pixel.WHITE, frameBuffer.getPixels()[0]);
    } catch (NoSuchFieldException | IllegalAccessException e) {
-      Assert.fail("Fail to modify field access.");
+      fail("Fail to modify field access.");
    }
  }

  @Test
-  public void testDraw() {
+  void testDraw() {
    var frameBuffer = new FrameBuffer();
    frameBuffer.draw(0, 0);
-    Assert.assertEquals(Pixel.BLACK, frameBuffer.getPixels()[0]);
+    assertEquals(Pixel.BLACK, frameBuffer.getPixels()[0]);
  }

  @Test
-  public void testGetPixels() {
+  void testGetPixels() {
    try {
      var field = FrameBuffer.class.getDeclaredField("pixels");
      var pixels = new Pixel[FrameBuffer.HEIGHT * FrameBuffer.WIDTH];
@ -83,9 +85,9 @@ public class FrameBufferTest {
      var frameBuffer = new FrameBuffer();
      field.setAccessible(true);
      field.set(frameBuffer, pixels);
-      Assert.assertEquals(pixels, frameBuffer.getPixels());
+      assertEquals(pixels, frameBuffer.getPixels());
    } catch (NoSuchFieldException | IllegalAccessException e) {
-      Assert.fail("Fail to modify field access.");
+      fail("Fail to modify field access.");
    }
  }

--- a/double-buffer/src/test/java/com/iluwatar/doublebuffer/SceneTest.java
+++ b/double-buffer/src/test/java/com/iluwatar/doublebuffer/SceneTest.java
@ -23,17 +23,19 @@

 package com.iluwatar.doublebuffer;

+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.fail;
+
 import java.util.ArrayList;
-import org.junit.Assert;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;

 /**
 * Scene unit tests.
 */
-public class SceneTest {
+class SceneTest {

  @Test
-  public void testGetBuffer() {
+  void testGetBuffer() {
    try {
      var scene = new Scene();
      var field1 = Scene.class.getDeclaredField("current");
@ -46,14 +48,14 @@ public class SceneTest {
      var field2 = Scene.class.getDeclaredField("frameBuffers");
      field2.setAccessible(true);
      field2.set(scene, frameBuffers);
-      Assert.assertEquals(frameBuffer, scene.getBuffer());
+      assertEquals(frameBuffer, scene.getBuffer());
    } catch (NoSuchFieldException | IllegalAccessException e) {
-      Assert.fail("Fail to access private field.");
+      fail("Fail to access private field.");
    }
  }

  @Test
-  public void testDraw() {
+  void testDraw() {
    try {
      var scene = new Scene();
      var field1 = Scene.class.getDeclaredField("current");
@ -63,10 +65,10 @@ public class SceneTest {
      field2.setAccessible(true);
      field2.set(scene, 1);
      scene.draw(new ArrayList<>());
-      Assert.assertEquals(1, field1.get(scene));
-      Assert.assertEquals(0, field2.get(scene));
+      assertEquals(1, field1.get(scene));
+      assertEquals(0, field2.get(scene));
    } catch (NoSuchFieldException | IllegalAccessException e) {
-      Assert.fail("Fail to access private field");
+      fail("Fail to access private field");
    }
  }
 }
--- a/event-asynchronous/src/main/java/com/iluwatar/event/asynchronous/EventManager.java
+++ b/event-asynchronous/src/main/java/com/iluwatar/event/asynchronous/EventManager.java
@ -23,8 +23,8 @@

 package com.iluwatar.event.asynchronous;

+import java.security.SecureRandom;
 import java.util.Map;
-import java.util.Random;
 import java.util.concurrent.ConcurrentHashMap;

 /**
@ -43,7 +43,7 @@ public class EventManager implements ThreadCompleteListener {
  public static final int MAX_ID = MAX_RUNNING_EVENTS;
  public static final int MAX_EVENT_TIME = 1800; // in seconds / 30 minutes.
  private int currentlyRunningSyncEvent = -1;
-  private final Random rand;
+  private final SecureRandom rand;
  private final Map<Integer, Event> eventPool;

  private static final String DOES_NOT_EXIST = " does not exist.";
@ -52,7 +52,7 @@ public class EventManager implements ThreadCompleteListener {
   * EventManager constructor.
   */
  public EventManager() {
-    rand = new Random(1);
+    rand = new SecureRandom();
    eventPool = new ConcurrentHashMap<Integer, Event>(MAX_RUNNING_EVENTS);

  }
--- a/factory/pom.xml
+++ b/factory/pom.xml
@ -38,10 +38,6 @@
  <artifactId>junit-jupiter-engine</artifactId>
  <scope>test</scope>
 </dependency>
- <dependency>
- <groupId>junit</groupId>
-  <artifactId>junit</artifactId>
- </dependency>
 </dependencies>
 <build>
 <plugins>
--- a/game-loop/pom.xml
+++ b/game-loop/pom.xml
@ -35,11 +35,6 @@

    <artifactId>game-loop</artifactId>
    <dependencies>
-        <dependency>
-            <groupId>junit</groupId>
-            <artifactId>junit</artifactId>
-        </dependency>
-
        <dependency>
            <groupId>org.junit.jupiter</groupId>
            <artifactId>junit-jupiter-engine</artifactId>
--- a/game-loop/src/main/java/com/iluwatar/gameloop/GameLoop.java
+++ b/game-loop/src/main/java/com/iluwatar/gameloop/GameLoop.java
@ -23,7 +23,7 @@

 package com.iluwatar.gameloop;

-import java.util.Random;
+import java.security.SecureRandom;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;

@ -80,7 +80,7 @@ public abstract class GameLoop {
   */
  protected void processInput() {
    try {
-      var lag = new Random().nextInt(200) + 50;
+      var lag = new SecureRandom().nextInt(200) + 50;
      Thread.sleep(lag);
    } catch (InterruptedException e) {
      logger.error(e.getMessage());
--- a/half-sync-half-async/pom.xml
+++ b/half-sync-half-async/pom.xml
@ -43,11 +43,6 @@
      <artifactId>mockito-core</artifactId>
      <scope>test</scope>
    </dependency>
-    <dependency>
-      <groupId>junit</groupId>
-      <artifactId>junit</artifactId>
-      <scope>test</scope>
-    </dependency>
  </dependencies>
  <build>
    <plugins>
--- a/hexagonal/src/main/java/com/iluwatar/hexagonal/domain/LotteryNumbers.java
+++ b/hexagonal/src/main/java/com/iluwatar/hexagonal/domain/LotteryNumbers.java
@ -24,10 +24,10 @@
 package com.iluwatar.hexagonal.domain;

 import com.google.common.base.Joiner;
+import java.security.SecureRandom;
 import java.util.Collections;
 import java.util.HashSet;
 import java.util.PrimitiveIterator;
-import java.util.Random;
 import java.util.Set;

 /**
@ -126,7 +126,7 @@ public class LotteryNumbers {
     * @param max the max value (inclusive)
     */
    public RandomNumberGenerator(int min, int max) {
-      randomIterator = new Random().ints(min, max + 1).iterator();
+      randomIterator = new SecureRandom().ints(min, max + 1).iterator();
    }

    /**
--- a/hexagonal/src/main/java/com/iluwatar/hexagonal/sampledata/SampleData.java
+++ b/hexagonal/src/main/java/com/iluwatar/hexagonal/sampledata/SampleData.java
@ -30,9 +30,9 @@ import com.iluwatar.hexagonal.domain.LotteryService;
 import com.iluwatar.hexagonal.domain.LotteryTicket;
 import com.iluwatar.hexagonal.domain.LotteryTicketId;
 import com.iluwatar.hexagonal.domain.PlayerDetails;
+import java.security.SecureRandom;
 import java.util.AbstractMap.SimpleEntry;
 import java.util.List;
-import java.util.Random;
 import java.util.stream.Collectors;

 /**
@ -41,7 +41,7 @@ import java.util.stream.Collectors;
 public class SampleData {

  private static final List<PlayerDetails> PLAYERS;
-  private static final Random RANDOM = new Random();
+  private static final SecureRandom RANDOM = new SecureRandom();

  static {
    PLAYERS = List.of(
--- a/leader-followers/pom.xml
+++ b/leader-followers/pom.xml
@ -32,11 +32,6 @@
    </parent>
    <artifactId>leader-followers</artifactId>
    <dependencies>
-        <dependency>
-            <groupId>junit</groupId>
-            <artifactId>junit</artifactId>
-            <scope>test</scope>
-        </dependency>
        <dependency>
            <groupId>org.junit.jupiter</groupId>
            <artifactId>junit-jupiter-engine</artifactId>
--- a/leader-followers/src/main/java/com/iluwatar/leaderfollowers/App.java
+++ b/leader-followers/src/main/java/com/iluwatar/leaderfollowers/App.java
@ -23,7 +23,7 @@

 package com.iluwatar.leaderfollowers;

-import java.util.Random;
+import java.security.SecureRandom;
 import java.util.concurrent.Executors;
 import java.util.concurrent.TimeUnit;

@ -84,7 +84,7 @@ public class App {
   * Add tasks.
   */
  private static void addTasks(TaskSet taskSet) throws InterruptedException {
-    var rand = new Random();
+    var rand = new SecureRandom();
    for (var i = 0; i < 5; i++) {
      var time = Math.abs(rand.nextInt(1000));
      taskSet.addTask(new Task(time));
--- a/leader-followers/src/test/java/com/AppTest.java
+++ b/leader-followers/src/test/java/com/AppTest.java
@ -23,20 +23,20 @@

 package com;

-import com.iluwatar.leaderfollowers.App;
-import org.junit.Test;
-
 import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;

+import com.iluwatar.leaderfollowers.App;
+import org.junit.jupiter.api.Test;
+
 /**
 *
 * Application test
 *
 */
-public class AppTest {
+class AppTest {

    @Test
-    public void shouldExecuteApplicationWithoutException() {
+    void shouldExecuteApplicationWithoutException() {
        assertDoesNotThrow(() -> App.main(new String[]{}));
    }

--- a/leader-followers/src/test/java/com/TaskHandlerTest.java
+++ b/leader-followers/src/test/java/com/TaskHandlerTest.java
@ -23,22 +23,23 @@

 package com;

+import static org.junit.jupiter.api.Assertions.assertTrue;
+
 import com.iluwatar.leaderfollowers.Task;
 import com.iluwatar.leaderfollowers.TaskHandler;
-import org.junit.Assert;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;

 /**
 * Tests for TaskHandler
 */
-public class TaskHandlerTest {
+class TaskHandlerTest {

    @Test
-    public void testHandleTask() throws InterruptedException {
+    void testHandleTask() throws InterruptedException {
        var taskHandler = new TaskHandler();
        var handle = new Task(100);
        taskHandler.handleTask(handle);
-        Assert.assertTrue(handle.isFinished());
+        assertTrue(handle.isFinished());
    }

 }
--- a/leader-followers/src/test/java/com/TaskSetTest.java
+++ b/leader-followers/src/test/java/com/TaskSetTest.java
@ -23,30 +23,31 @@

 package com;

+import static org.junit.jupiter.api.Assertions.assertEquals;
+
 import com.iluwatar.leaderfollowers.Task;
 import com.iluwatar.leaderfollowers.TaskSet;
-import org.junit.Assert;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;

 /**
 * Tests for TaskSet
 */
-public class TaskSetTest {
+class TaskSetTest {

    @Test
-    public void testAddTask() throws InterruptedException {
+    void testAddTask() throws InterruptedException {
        var taskSet = new TaskSet();
        taskSet.addTask(new Task(10));
-        Assert.assertTrue(taskSet.getSize() == 1);
+        assertEquals(1, taskSet.getSize());
    }

    @Test
-    public void testGetTask() throws InterruptedException {
+    void testGetTask() throws InterruptedException {
        var taskSet = new TaskSet();
        taskSet.addTask(new Task(100));
        Task task = taskSet.getTask();
-        Assert.assertTrue(task.getTime() == 100);
-        Assert.assertTrue(taskSet.getSize() == 0);
+        assertEquals(100, task.getTime());
+        assertEquals(0, taskSet.getSize());
    }

 }
--- a/leader-followers/src/test/java/com/WorkCenterTest.java
+++ b/leader-followers/src/test/java/com/WorkCenterTest.java
@ -23,43 +23,45 @@

 package com;

+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNull;
+
 import com.iluwatar.leaderfollowers.TaskHandler;
 import com.iluwatar.leaderfollowers.TaskSet;
 import com.iluwatar.leaderfollowers.WorkCenter;
-import org.junit.Assert;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;

 /**
 * Tests for WorkCenter
 */
-public class WorkCenterTest {
+class WorkCenterTest {

  @Test
-  public void testCreateWorkers() {
+  void testCreateWorkers() {
    var taskSet = new TaskSet();
    var taskHandler = new TaskHandler();
    var workCenter = new WorkCenter();
    workCenter.createWorkers(5, taskSet, taskHandler);
-    Assert.assertEquals(workCenter.getWorkers().size(), 5);
-    Assert.assertEquals(workCenter.getWorkers().get(0), workCenter.getLeader());
+    assertEquals(5, workCenter.getWorkers().size());
+    assertEquals(workCenter.getWorkers().get(0), workCenter.getLeader());
  }

  @Test
-  public void testNullLeader() {
+  void testNullLeader() {
    var workCenter = new WorkCenter();
    workCenter.promoteLeader();
-    Assert.assertNull(workCenter.getLeader());
+    assertNull(workCenter.getLeader());
  }

  @Test
-  public void testPromoteLeader() {
+  void testPromoteLeader() {
    var taskSet = new TaskSet();
    var taskHandler = new TaskHandler();
    var workCenter = new WorkCenter();
    workCenter.createWorkers(5, taskSet, taskHandler);
    workCenter.removeWorker(workCenter.getLeader());
    workCenter.promoteLeader();
-    Assert.assertEquals(workCenter.getWorkers().size(), 4);
-    Assert.assertEquals(workCenter.getWorkers().get(0), workCenter.getLeader());
+    assertEquals(4, workCenter.getWorkers().size());
+    assertEquals(workCenter.getWorkers().get(0), workCenter.getLeader());
  }
 }
--- a/marker/src/test/java/GuardTest.java
+++ b/marker/src/test/java/GuardTest.java
@ -21,18 +21,18 @@
 * THE SOFTWARE.
 */

-import org.junit.jupiter.api.Test;
-
 import static org.hamcrest.CoreMatchers.instanceOf;
 import static org.hamcrest.MatcherAssert.assertThat;

+import org.junit.jupiter.api.Test;
+
 /**
 * Guard test
 */
-public class GuardTest {
+class GuardTest {

  @Test
-  public void testGuard() {
+  void testGuard() {
    var guard = new Guard();
    assertThat(guard, instanceOf(Permission.class));
  }
--- a/master-worker-pattern/src/main/java/com/iluwatar/masterworker/ArrayUtilityMethods.java
+++ b/master-worker-pattern/src/main/java/com/iluwatar/masterworker/ArrayUtilityMethods.java
@ -23,7 +23,7 @@

 package com.iluwatar.masterworker;

-import java.util.Random;
+import java.security.SecureRandom;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;

@ -35,7 +35,7 @@ public class ArrayUtilityMethods {

  private static final Logger LOGGER = LoggerFactory.getLogger(ArrayUtilityMethods.class);

-  private static final Random RANDOM = new Random();
+  private static final SecureRandom RANDOM = new SecureRandom();

  /**
   * Method arraysSame compares 2 arrays @param a1 and @param a2 and @return whether their values
--- a/310
+++ b/310
@ -0,0 +1,310 @@
+#!/bin/sh
+# ----------------------------------------------------------------------------
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+# ----------------------------------------------------------------------------
+
+# ----------------------------------------------------------------------------
+# Maven Start Up Batch script
+#
+# Required ENV vars:
+# ------------------
+#   JAVA_HOME - location of a JDK home dir
+#
+# Optional ENV vars
+# -----------------
+#   M2_HOME - location of maven2's installed home dir
+#   MAVEN_OPTS - parameters passed to the Java VM when running Maven
+#     e.g. to debug Maven itself, use
+#       set MAVEN_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000
+#   MAVEN_SKIP_RC - flag to disable loading of mavenrc files
+# ----------------------------------------------------------------------------
+
+if [ -z "$MAVEN_SKIP_RC" ] ; then
+
+  if [ -f /etc/mavenrc ] ; then
+    . /etc/mavenrc
+  fi
+
+  if [ -f "$HOME/.mavenrc" ] ; then
+    . "$HOME/.mavenrc"
+  fi
+
+fi
+
+# OS specific support.  $var _must_ be set to either true or false.
+cygwin=false;
+darwin=false;
+mingw=false
+case "`uname`" in
+  CYGWIN*) cygwin=true ;;
+  MINGW*) mingw=true;;
+  Darwin*) darwin=true
+    # Use /usr/libexec/java_home if available, otherwise fall back to /Library/Java/Home
+    # See https://developer.apple.com/library/mac/qa/qa1170/_index.html
+    if [ -z "$JAVA_HOME" ]; then
+      if [ -x "/usr/libexec/java_home" ]; then
+        export JAVA_HOME="`/usr/libexec/java_home`"
+      else
+        export JAVA_HOME="/Library/Java/Home"
+      fi
+    fi
+    ;;
+esac
+
+if [ -z "$JAVA_HOME" ] ; then
+  if [ -r /etc/gentoo-release ] ; then
+    JAVA_HOME=`java-config --jre-home`
+  fi
+fi
+
+if [ -z "$M2_HOME" ] ; then
+  ## resolve links - $0 may be a link to maven's home
+  PRG="$0"
+
+  # need this for relative symlinks
+  while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+      PRG="$link"
+    else
+      PRG="`dirname "$PRG"`/$link"
+    fi
+  done
+
+  saveddir=`pwd`
+
+  M2_HOME=`dirname "$PRG"`/..
+
+  # make it fully qualified
+  M2_HOME=`cd "$M2_HOME" && pwd`
+
+  cd "$saveddir"
+  # echo Using m2 at $M2_HOME
+fi
+
+# For Cygwin, ensure paths are in UNIX format before anything is touched
+if $cygwin ; then
+  [ -n "$M2_HOME" ] &&
+    M2_HOME=`cygpath --unix "$M2_HOME"`
+  [ -n "$JAVA_HOME" ] &&
+    JAVA_HOME=`cygpath --unix "$JAVA_HOME"`
+  [ -n "$CLASSPATH" ] &&
+    CLASSPATH=`cygpath --path --unix "$CLASSPATH"`
+fi
+
+# For Mingw, ensure paths are in UNIX format before anything is touched
+if $mingw ; then
+  [ -n "$M2_HOME" ] &&
+    M2_HOME="`(cd "$M2_HOME"; pwd)`"
+  [ -n "$JAVA_HOME" ] &&
+    JAVA_HOME="`(cd "$JAVA_HOME"; pwd)`"
+fi
+
+if [ -z "$JAVA_HOME" ]; then
+  javaExecutable="`which javac`"
+  if [ -n "$javaExecutable" ] && ! [ "`expr \"$javaExecutable\" : '\([^ ]*\)'`" = "no" ]; then
+    # readlink(1) is not available as standard on Solaris 10.
+    readLink=`which readlink`
+    if [ ! `expr "$readLink" : '\([^ ]*\)'` = "no" ]; then
+      if $darwin ; then
+        javaHome="`dirname \"$javaExecutable\"`"
+        javaExecutable="`cd \"$javaHome\" && pwd -P`/javac"
+      else
+        javaExecutable="`readlink -f \"$javaExecutable\"`"
+      fi
+      javaHome="`dirname \"$javaExecutable\"`"
+      javaHome=`expr "$javaHome" : '\(.*\)/bin'`
+      JAVA_HOME="$javaHome"
+      export JAVA_HOME
+    fi
+  fi
+fi
+
+if [ -z "$JAVACMD" ] ; then
+  if [ -n "$JAVA_HOME"  ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+      # IBM's JDK on AIX uses strange locations for the executables
+      JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+      JAVACMD="$JAVA_HOME/bin/java"
+    fi
+  else
+    JAVACMD="`which java`"
+  fi
+fi
+
+if [ ! -x "$JAVACMD" ] ; then
+  echo "Error: JAVA_HOME is not defined correctly." >&2
+  echo "  We cannot execute $JAVACMD" >&2
+  exit 1
+fi
+
+if [ -z "$JAVA_HOME" ] ; then
+  echo "Warning: JAVA_HOME environment variable is not set."
+fi
+
+CLASSWORLDS_LAUNCHER=org.codehaus.plexus.classworlds.launcher.Launcher
+
+# traverses directory structure from process work directory to filesystem root
+# first directory with .mvn subdirectory is considered project base directory
+find_maven_basedir() {
+
+  if [ -z "$1" ]
+  then
+    echo "Path not specified to find_maven_basedir"
+    return 1
+  fi
+
+  basedir="$1"
+  wdir="$1"
+  while [ "$wdir" != '/' ] ; do
+    if [ -d "$wdir"/.mvn ] ; then
+      basedir=$wdir
+      break
+    fi
+    # workaround for JBEAP-8937 (on Solaris 10/Sparc)
+    if [ -d "${wdir}" ]; then
+      wdir=`cd "$wdir/.."; pwd`
+    fi
+    # end of workaround
+  done
+  echo "${basedir}"
+}
+
+# concatenates all lines of a file
+concat_lines() {
+  if [ -f "$1" ]; then
+    echo "$(tr -s '\n' ' ' < "$1")"
+  fi
+}
+
+BASE_DIR=`find_maven_basedir "$(pwd)"`
+if [ -z "$BASE_DIR" ]; then
+  exit 1;
+fi
+
+##########################################################################################
+# Extension to allow automatically downloading the maven-wrapper.jar from Maven-central
+# This allows using the maven wrapper in projects that prohibit checking in binary data.
+##########################################################################################
+if [ -r "$BASE_DIR/.mvn/wrapper/maven-wrapper.jar" ]; then
+    if [ "$MVNW_VERBOSE" = true ]; then
+      echo "Found .mvn/wrapper/maven-wrapper.jar"
+    fi
+else
+    if [ "$MVNW_VERBOSE" = true ]; then
+      echo "Couldn't find .mvn/wrapper/maven-wrapper.jar, downloading it ..."
+    fi
+    if [ -n "$MVNW_REPOURL" ]; then
+      jarUrl="$MVNW_REPOURL/io/takari/maven-wrapper/0.5.6/maven-wrapper-0.5.6.jar"
+    else
+      jarUrl="https://repo.maven.apache.org/maven2/io/takari/maven-wrapper/0.5.6/maven-wrapper-0.5.6.jar"
+    fi
+    while IFS="=" read key value; do
+      case "$key" in (wrapperUrl) jarUrl="$value"; break ;;
+      esac
+    done < "$BASE_DIR/.mvn/wrapper/maven-wrapper.properties"
+    if [ "$MVNW_VERBOSE" = true ]; then
+      echo "Downloading from: $jarUrl"
+    fi
+    wrapperJarPath="$BASE_DIR/.mvn/wrapper/maven-wrapper.jar"
+    if $cygwin; then
+      wrapperJarPath=`cygpath --path --windows "$wrapperJarPath"`
+    fi
+
+    if command -v wget > /dev/null; then
+        if [ "$MVNW_VERBOSE" = true ]; then
+          echo "Found wget ... using wget"
+        fi
+        if [ -z "$MVNW_USERNAME" ] || [ -z "$MVNW_PASSWORD" ]; then
+            wget "$jarUrl" -O "$wrapperJarPath"
+        else
+            wget --http-user=$MVNW_USERNAME --http-password=$MVNW_PASSWORD "$jarUrl" -O "$wrapperJarPath"
+        fi
+    elif command -v curl > /dev/null; then
+        if [ "$MVNW_VERBOSE" = true ]; then
+          echo "Found curl ... using curl"
+        fi
+        if [ -z "$MVNW_USERNAME" ] || [ -z "$MVNW_PASSWORD" ]; then
+            curl -o "$wrapperJarPath" "$jarUrl" -f
+        else
+            curl --user $MVNW_USERNAME:$MVNW_PASSWORD -o "$wrapperJarPath" "$jarUrl" -f
+        fi
+
+    else
+        if [ "$MVNW_VERBOSE" = true ]; then
+          echo "Falling back to using Java to download"
+        fi
+        javaClass="$BASE_DIR/.mvn/wrapper/MavenWrapperDownloader.java"
+        # For Cygwin, switch paths to Windows format before running javac
+        if $cygwin; then
+          javaClass=`cygpath --path --windows "$javaClass"`
+        fi
+        if [ -e "$javaClass" ]; then
+            if [ ! -e "$BASE_DIR/.mvn/wrapper/MavenWrapperDownloader.class" ]; then
+                if [ "$MVNW_VERBOSE" = true ]; then
+                  echo " - Compiling MavenWrapperDownloader.java ..."
+                fi
+                # Compiling the Java class
+                ("$JAVA_HOME/bin/javac" "$javaClass")
+            fi
+            if [ -e "$BASE_DIR/.mvn/wrapper/MavenWrapperDownloader.class" ]; then
+                # Running the downloader
+                if [ "$MVNW_VERBOSE" = true ]; then
+                  echo " - Running MavenWrapperDownloader.java ..."
+                fi
+                ("$JAVA_HOME/bin/java" -cp .mvn/wrapper MavenWrapperDownloader "$MAVEN_PROJECTBASEDIR")
+            fi
+        fi
+    fi
+fi
+##########################################################################################
+# End of extension
+##########################################################################################
+
+export MAVEN_PROJECTBASEDIR=${MAVEN_BASEDIR:-"$BASE_DIR"}
+if [ "$MVNW_VERBOSE" = true ]; then
+  echo $MAVEN_PROJECTBASEDIR
+fi
+MAVEN_OPTS="$(concat_lines "$MAVEN_PROJECTBASEDIR/.mvn/jvm.config") $MAVEN_OPTS"
+
+# For Cygwin, switch paths to Windows format before running java
+if $cygwin; then
+  [ -n "$M2_HOME" ] &&
+    M2_HOME=`cygpath --path --windows "$M2_HOME"`
+  [ -n "$JAVA_HOME" ] &&
+    JAVA_HOME=`cygpath --path --windows "$JAVA_HOME"`
+  [ -n "$CLASSPATH" ] &&
+    CLASSPATH=`cygpath --path --windows "$CLASSPATH"`
+  [ -n "$MAVEN_PROJECTBASEDIR" ] &&
+    MAVEN_PROJECTBASEDIR=`cygpath --path --windows "$MAVEN_PROJECTBASEDIR"`
+fi
+
+# Provide a "standardized" way to retrieve the CLI args that will
+# work with both Windows and non-Windows executions.
+MAVEN_CMD_LINE_ARGS="$MAVEN_CONFIG $@"
+export MAVEN_CMD_LINE_ARGS
+
+WRAPPER_LAUNCHER=org.apache.maven.wrapper.MavenWrapperMain
+
+exec "$JAVACMD" \
+  $MAVEN_OPTS \
+  -classpath "$MAVEN_PROJECTBASEDIR/.mvn/wrapper/maven-wrapper.jar" \
+  "-Dmaven.home=${M2_HOME}" "-Dmaven.multiModuleProjectDirectory=${MAVEN_PROJECTBASEDIR}" \
+  ${WRAPPER_LAUNCHER} $MAVEN_CONFIG "$@"
--- a/mvnw.cmd
+++ b/mvnw.cmd
@ -0,0 +1,186 @@
+@REM
+@REM The MIT License
+@REM Copyright © 2014-2021 Ilkka Seppälä
+@REM
+@REM Permission is hereby granted, free of charge, to any person obtaining a copy
+@REM of this software and associated documentation files (the "Software"), to deal
+@REM in the Software without restriction, including without limitation the rights
+@REM to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+@REM copies of the Software, and to permit persons to whom the Software is
+@REM furnished to do so, subject to the following conditions:
+@REM
+@REM The above copyright notice and this permission notice shall be included in
+@REM all copies or substantial portions of the Software.
+@REM
+@REM THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+@REM IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+@REM FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+@REM AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+@REM LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+@REM OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+@REM THE SOFTWARE.
+@REM
+
+@REM ----------------------------------------------------------------------------
+@REM Maven Start Up Batch script
+@REM
+@REM Required ENV vars:
+@REM JAVA_HOME - location of a JDK home dir
+@REM
+@REM Optional ENV vars
+@REM M2_HOME - location of maven2's installed home dir
+@REM MAVEN_BATCH_ECHO - set to 'on' to enable the echoing of the batch commands
+@REM MAVEN_BATCH_PAUSE - set to 'on' to wait for a keystroke before ending
+@REM MAVEN_OPTS - parameters passed to the Java VM when running Maven
+@REM     e.g. to debug Maven itself, use
+@REM set MAVEN_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000
+@REM MAVEN_SKIP_RC - flag to disable loading of mavenrc files
+@REM ----------------------------------------------------------------------------
+
+@REM Begin all REM lines with '@' in case MAVEN_BATCH_ECHO is 'on'
+@echo off
+@REM set title of command window
+title %0
+@REM enable echoing by setting MAVEN_BATCH_ECHO to 'on'
+@if "%MAVEN_BATCH_ECHO%" == "on"  echo %MAVEN_BATCH_ECHO%
+
+@REM set %HOME% to equivalent of $HOME
+if "%HOME%" == "" (set "HOME=%HOMEDRIVE%%HOMEPATH%")
+
+@REM Execute a user defined script before this one
+if not "%MAVEN_SKIP_RC%" == "" goto skipRcPre
+@REM check for pre script, once with legacy .bat ending and once with .cmd ending
+if exist "%HOME%\mavenrc_pre.bat" call "%HOME%\mavenrc_pre.bat"
+if exist "%HOME%\mavenrc_pre.cmd" call "%HOME%\mavenrc_pre.cmd"
+:skipRcPre
+
+@setlocal
+
+set ERROR_CODE=0
+
+@REM To isolate internal variables from possible post scripts, we use another setlocal
+@setlocal
+
+@REM ==== START VALIDATION ====
+if not "%JAVA_HOME%" == "" goto OkJHome
+
+echo.
+echo Error: JAVA_HOME not found in your environment. >&2
+echo Please set the JAVA_HOME variable in your environment to match the >&2
+echo location of your Java installation. >&2
+echo.
+goto error
+
+:OkJHome
+if exist "%JAVA_HOME%\bin\java.exe" goto init
+
+echo.
+echo Error: JAVA_HOME is set to an invalid directory. >&2
+echo JAVA_HOME = "%JAVA_HOME%" >&2
+echo Please set the JAVA_HOME variable in your environment to match the >&2
+echo location of your Java installation. >&2
+echo.
+goto error
+
+@REM ==== END VALIDATION ====
+
+:init
+
+@REM Find the project base dir, i.e. the directory that contains the folder ".mvn".
+@REM Fallback to current working directory if not found.
+
+set MAVEN_PROJECTBASEDIR=%MAVEN_BASEDIR%
+IF NOT "%MAVEN_PROJECTBASEDIR%"=="" goto endDetectBaseDir
+
+set EXEC_DIR=%CD%
+set WDIR=%EXEC_DIR%
+:findBaseDir
+IF EXIST "%WDIR%"\.mvn goto baseDirFound
+cd ..
+IF "%WDIR%"=="%CD%" goto baseDirNotFound
+set WDIR=%CD%
+goto findBaseDir
+
+:baseDirFound
+set MAVEN_PROJECTBASEDIR=%WDIR%
+cd "%EXEC_DIR%"
+goto endDetectBaseDir
+
+:baseDirNotFound
+set MAVEN_PROJECTBASEDIR=%EXEC_DIR%
+cd "%EXEC_DIR%"
+
+:endDetectBaseDir
+
+IF NOT EXIST "%MAVEN_PROJECTBASEDIR%\.mvn\jvm.config" goto endReadAdditionalConfig
+
+@setlocal EnableExtensions EnableDelayedExpansion
+for /F "usebackq delims=" %%a in ("%MAVEN_PROJECTBASEDIR%\.mvn\jvm.config") do set JVM_CONFIG_MAVEN_PROPS=!JVM_CONFIG_MAVEN_PROPS! %%a
+@endlocal & set JVM_CONFIG_MAVEN_PROPS=%JVM_CONFIG_MAVEN_PROPS%
+
+:endReadAdditionalConfig
+
+SET MAVEN_JAVA_EXE="%JAVA_HOME%\bin\java.exe"
+set WRAPPER_JAR="%MAVEN_PROJECTBASEDIR%\.mvn\wrapper\maven-wrapper.jar"
+set WRAPPER_LAUNCHER=org.apache.maven.wrapper.MavenWrapperMain
+
+set DOWNLOAD_URL="https://repo.maven.apache.org/maven2/io/takari/maven-wrapper/0.5.6/maven-wrapper-0.5.6.jar"
+
+FOR /F "tokens=1,2 delims==" %%A IN ("%MAVEN_PROJECTBASEDIR%\.mvn\wrapper\maven-wrapper.properties") DO (
+    IF "%%A"=="wrapperUrl" SET DOWNLOAD_URL=%%B
+)
+
+@REM Extension to allow automatically downloading the maven-wrapper.jar from Maven-central
+@REM This allows using the maven wrapper in projects that prohibit checking in binary data.
+if exist %WRAPPER_JAR% (
+    if "%MVNW_VERBOSE%" == "true" (
+        echo Found %WRAPPER_JAR%
+    )
+) else (
+    if not "%MVNW_REPOURL%" == "" (
+        SET DOWNLOAD_URL="%MVNW_REPOURL%/io/takari/maven-wrapper/0.5.6/maven-wrapper-0.5.6.jar"
+    )
+    if "%MVNW_VERBOSE%" == "true" (
+        echo Couldn't find %WRAPPER_JAR%, downloading it ...
+        echo Downloading from: %DOWNLOAD_URL%
+    )
+
+    powershell -Command "&{"^
+		"$webclient = new-object System.Net.WebClient;"^
+		"if (-not ([string]::IsNullOrEmpty('%MVNW_USERNAME%') -and [string]::IsNullOrEmpty('%MVNW_PASSWORD%'))) {"^
+		"$webclient.Credentials = new-object System.Net.NetworkCredential('%MVNW_USERNAME%', '%MVNW_PASSWORD%');"^
+		"}"^
+		"[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12; $webclient.DownloadFile('%DOWNLOAD_URL%', '%WRAPPER_JAR%')"^
+		"}"
+    if "%MVNW_VERBOSE%" == "true" (
+        echo Finished downloading %WRAPPER_JAR%
+    )
+)
+@REM End of extension
+
+@REM Provide a "standardized" way to retrieve the CLI args that will
+@REM work with both Windows and non-Windows executions.
+set MAVEN_CMD_LINE_ARGS=%*
+
+%MAVEN_JAVA_EXE% %JVM_CONFIG_MAVEN_PROPS% %MAVEN_OPTS% %MAVEN_DEBUG_OPTS% -classpath %WRAPPER_JAR% "-Dmaven.multiModuleProjectDirectory=%MAVEN_PROJECTBASEDIR%" %WRAPPER_LAUNCHER% %MAVEN_CONFIG% %*
+if ERRORLEVEL 1 goto error
+goto end
+
+:error
+set ERROR_CODE=1
+
+:end
+@endlocal & set ERROR_CODE=%ERROR_CODE%
+
+if not "%MAVEN_SKIP_RC%" == "" goto skipRcPost
+@REM check for post script, once with legacy .bat ending and once with .cmd ending
+if exist "%HOME%\mavenrc_post.bat" call "%HOME%\mavenrc_post.bat"
+if exist "%HOME%\mavenrc_post.cmd" call "%HOME%\mavenrc_post.cmd"
+:skipRcPost
+
+@REM pause the script if MAVEN_BATCH_PAUSE is set to 'on'
+if "%MAVEN_BATCH_PAUSE%" == "on" pause
+
+if "%MAVEN_TERMINATE_CMD%" == "on" exit %ERROR_CODE%
+
+exit /B %ERROR_CODE%
--- a/parameter-object/README.md
+++ b/parameter-object/README.md
@ -0,0 +1,138 @@
+---
+layout: pattern
+title: Parameter Object
+folder: parameter-object
+permalink: /patterns/parameter-object/
+categories: Behavioral
+tags:
+ - Extensibility
+---
+
+## Intent
+
+The syntax of Java language doesn’t allow you to declare a method with a predefined value
+for a parameter. Probably the best option to achieve default method parameters in Java is
+by using the method overloading. Method overloading allows you to declare several methods
+with the same name but with a different number of parameters. But the main problem with
+method overloading as a solution for default parameter values reveals itself when a method
+accepts multiple parameters. Creating an overloaded method for each possible combination of
+parameters might be cumbersome. To deal with this issue, the Parameter Object pattern is used.
+
+## Explanation
+
+The Parameter Object is simply a wrapper object for all parameters of a method.
+It is nothing more than just a regular POJO. The advantage of the Parameter Object over a
+regular method parameter list is the fact that class fields can have default values.
+Once the wrapper class is created for the method parameter list, a corresponding builder class
+is also created. Usually it's an inner static class. The final step is to use the builder
+to construct a new parameter object. For those parameters that are skipped,
+their default values are going to be used.
+
+
+**Programmatic Example**
+
+Here's the simple `SearchService` class where Method Overloading is used to default values here. To use method overloading, either the number of arguments or argument type has to be different.
+
+```java
+public class SearchService {
+  //Method Overloading example. SortOrder is defaulted in this method
+  public String search(String type, String sortBy) {
+    return getQuerySummary(type, sortBy, SortOrder.DESC);
+  }
+
+  /* Method Overloading example. SortBy is defaulted in this method. Note that the type has to be 
+  different here to overload the method */
+  public String search(String type, SortOrder sortOrder) {
+    return getQuerySummary(type, "price", sortOrder);
+  }
+
+  private String getQuerySummary(String type, String sortBy, SortOrder sortOrder) {
+    return "Requesting shoes of type \"" + type + "\" sorted by \"" + sortBy + "\" in \""
+        + sortOrder.getValue() + "ending\" order...";
+  }
+}
+
+```
+
+Next we present the `SearchService` with `ParameterObject` created with Builder pattern.
+
+```java
+public class SearchService {
+
+  /* Parameter Object example. Default values are abstracted into the Parameter Object 
+  at the time of Object creation */
+  public String search(ParameterObject parameterObject) {
+    return getQuerySummary(parameterObject.getType(), parameterObject.getSortBy(),
+        parameterObject.getSortOrder());
+  }
+  
+  private String getQuerySummary(String type, String sortBy, SortOrder sortOrder) {
+    return "Requesting shoes of type \"" + type + "\" sorted by \"" + sortBy + "\" in \""
+        + sortOrder.getValue() + "ending\" order...";
+  }
+}
+
+public class ParameterObject {
+  public static final String DEFAULT_SORT_BY = "price";
+  public static final SortOrder DEFAULT_SORT_ORDER = SortOrder.ASC;
+
+  private String type;
+  private String sortBy = DEFAULT_SORT_BY;
+  private SortOrder sortOrder = DEFAULT_SORT_ORDER;
+
+  private ParameterObject(Builder builder) {
+    type = builder.type;
+    sortBy = builder.sortBy != null && !builder.sortBy.isBlank() ? builder.sortBy : sortBy;
+    sortOrder = builder.sortOrder != null ? builder.sortOrder : sortOrder;
+  }
+
+  public static Builder newBuilder() {
+    return new Builder();
+  }
+
+  //Getters and Setters...
+
+  public static final class Builder {
+
+    private String type;
+    private String sortBy;
+    private SortOrder sortOrder;
+
+    private Builder() {
+    }
+
+    public Builder withType(String type) {
+      this.type = type;
+      return this;
+    }
+
+    public Builder sortBy(String sortBy) {
+      this.sortBy = sortBy;
+      return this;
+    }
+
+    public Builder sortOrder(SortOrder sortOrder) {
+      this.sortOrder = sortOrder;
+      return this;
+    }
+
+    public ParameterObject build() {
+      return new ParameterObject(this);
+    }
+  }
+}
+
+
+```
+
+## Class diagram
+
+![alt text](./etc/parameter-object.png "Parameter Object")
+
+## Applicability
+
+This pattern shows us the way to have default parameters for a method in Java as the language doesn't default parameters feature out of the box. 
+
+## Credits
+
+- [Does Java have default parameters?](http://dolszewski.com/java/java-default-parameters)
--- a/parameter-object/etc/parameter-object.png
+++ b/parameter-object/etc/parameter-object.png
--- a/parameter-object/etc/parameter-object.urm.puml
+++ b/parameter-object/etc/parameter-object.urm.puml
@ -0,0 +1,52 @@
+@startuml
+package com.iluwatar.parameter.object {
+  class App {
+    - LOGGER : Logger {static}
+    + App()
+    + main(args : String[]) {static}
+  }
+  class ParameterObject {
+    + DEFAULT_SORT_BY : String {static}
+    + DEFAULT_SORT_ORDER : SortOrder {static}
+    - sortBy : String
+    - sortOrder : SortOrder
+    - type : String
+    - ParameterObject(builder : Builder)
+    + getSortBy() : String
+    + getSortOrder() : SortOrder
+    + getType() : String
+    + newBuilder() : Builder {static}
+    + setSortBy(sortBy : String)
+    + setSortOrder(sortOrder : SortOrder)
+    + setType(type : String)
+  }
+  class Builder {
+    - sortBy : String
+    - sortOrder : SortOrder
+    - type : String
+    - Builder()
+    + build() : ParameterObject
+    + sortBy(sortBy : String) : Builder
+    + sortOrder(sortOrder : SortOrder) : Builder
+    + withType(type : String) : Builder
+  }
+  class SearchService {
+    + SearchService()
+    - getQuerySummary(type : String, sortBy : String, sortOrder : SortOrder) : String
+    + search(parameterObject : ParameterObject) : String
+    + search(type : String, sortBy : String) : String
+    + search(type : String, sortOrder : SortOrder) : String
+  }
+  enum SortOrder {
+    + ASC {static}
+    + DESC {static}
+    - value : String
+    + getValue() : String
+    + valueOf(name : String) : SortOrder {static}
+    + values() : SortOrder[] {static}
+  }
+}
+Builder -->  "-sortOrder" SortOrder
+Builder ..+ ParameterObject
+ParameterObject -->  "-DEFAULT_SORT_ORDER" SortOrder
+@enduml
--- a/parameter-object/pom.xml
+++ b/parameter-object/pom.xml
@ -0,0 +1,61 @@
+<?xml version="1.0"?>
+<!--
+
+    The MIT License
+    Copyright © 2014-2021 Ilkka Seppälä
+
+    Permission is hereby granted, free of charge, to any person obtaining a copy
+    of this software and associated documentation files (the "Software"), to deal
+    in the Software without restriction, including without limitation the rights
+    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+    copies of the Software, and to permit persons to whom the Software is
+    furnished to do so, subject to the following conditions:
+
+    The above copyright notice and this permission notice shall be included in
+    all copies or substantial portions of the Software.
+
+    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+    THE SOFTWARE.
+
+-->
+<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
+  <modelVersion>4.0.0</modelVersion>
+  <parent>
+    <groupId>com.iluwatar</groupId>
+    <artifactId>java-design-patterns</artifactId>
+    <version>1.24.0-SNAPSHOT</version>
+  </parent>
+  <artifactId>parameter-object</artifactId>
+  <dependencies>
+    <dependency>
+      <groupId>org.junit.jupiter</groupId>
+      <artifactId>junit-jupiter-engine</artifactId>
+      <scope>test</scope>
+    </dependency>
+  </dependencies>
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-assembly-plugin</artifactId>
+        <executions>
+          <execution>
+            <configuration>
+              <archive>
+                <manifest>
+                  <mainClass>com.iluwatar.parameter.object.App</mainClass>
+                </manifest>
+              </archive>
+            </configuration>
+          </execution>
+        </executions>
+      </plugin>
+    </plugins>
+  </build>
+</project>
--- a/parameter-object/src/main/java/com/iluwatar/parameter/object/App.java
+++ b/parameter-object/src/main/java/com/iluwatar/parameter/object/App.java
@ -0,0 +1,62 @@
+/*
+ * The MIT License
+ * Copyright © 2014-2021 Ilkka Seppälä
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+package com.iluwatar.parameter.object;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * The syntax of Java language doesn’t allow you to declare a method with a predefined value
+ * for a parameter. Probably the best option to achieve default method parameters in Java is
+ * by using the method overloading. Method overloading allows you to declare several methods
+ * with the same name but with a different number of parameters. But the main problem with
+ * method overloading as a solution for default parameter values reveals itself when a method
+ * accepts multiple parameters. Creating an overloaded method for each possible combination of
+ * parameters might be cumbersome. To deal with this issue, the Parameter Object pattern is used.
+ * The Parameter Object is simply a wrapper object for all parameters of a method.
+ * It is nothing more than just a regular POJO. The advantage of the Parameter Object over a
+ * regular method parameter list is the fact that class fields can have default values.
+ * Once the wrapper class is created for the method parameter list, a corresponding builder class
+ * is also created. Usually it's an inner static class. The final step is to use the builder
+ * to construct a new parameter object. For those parameters that are skipped,
+ * their default values are going to be used.
+ */
+public class App {
+
+  private static final Logger LOGGER = LoggerFactory.getLogger(App.class);
+
+  /**
+   * Program entry point.
+   *
+   * @param args command line args
+   */
+  public static void main(String[] args) {
+    ParameterObject params = ParameterObject.newBuilder()
+        .withType("sneakers")
+        .sortBy("brand")
+        .build();
+    LOGGER.info(params.toString());
+    LOGGER.info(new SearchService().search(params));
+  }
+}
--- a/parameter-object/src/main/java/com/iluwatar/parameter/object/ParameterObject.java
+++ b/parameter-object/src/main/java/com/iluwatar/parameter/object/ParameterObject.java
@ -0,0 +1,113 @@
+/*
+ * The MIT License
+ * Copyright © 2014-2021 Ilkka Seppälä
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+package com.iluwatar.parameter.object;
+
+public class ParameterObject {
+
+  /**
+   * Default values are defined here.
+   */
+  public static final String DEFAULT_SORT_BY = "price";
+  public static final SortOrder DEFAULT_SORT_ORDER = SortOrder.ASC;
+
+  private String type;
+
+  /**
+   * Default values are assigned here.
+   */
+  private String sortBy = DEFAULT_SORT_BY;
+  private SortOrder sortOrder = DEFAULT_SORT_ORDER;
+
+  /**
+   * Overriding default values on object creation only when builder object has a valid value.
+   */
+  private ParameterObject(Builder builder) {
+    setType(builder.type);
+    setSortBy(builder.sortBy != null && !builder.sortBy.isBlank() ? builder.sortBy : sortBy);
+    setSortOrder(builder.sortOrder != null ? builder.sortOrder : sortOrder);
+  }
+
+  public static Builder newBuilder() {
+    return new Builder();
+  }
+
+  public String getType() {
+    return type;
+  }
+
+  public void setType(String type) {
+    this.type = type;
+  }
+
+  public String getSortBy() {
+    return sortBy;
+  }
+
+  public void setSortBy(String sortBy) {
+    this.sortBy = sortBy;
+  }
+
+  public SortOrder getSortOrder() {
+    return sortOrder;
+  }
+
+  public void setSortOrder(SortOrder sortOrder) {
+    this.sortOrder = sortOrder;
+  }
+
+  @Override
+  public String toString() {
+    return String.format("ParameterObject[type='%s', sortBy='%s', sortOrder='%s']",
+        type, sortBy, sortOrder);
+  }
+
+  public static final class Builder {
+
+    private String type;
+    private String sortBy;
+    private SortOrder sortOrder;
+
+    private Builder() {
+    }
+
+    public Builder withType(String type) {
+      this.type = type;
+      return this;
+    }
+
+    public Builder sortBy(String sortBy) {
+      this.sortBy = sortBy;
+      return this;
+    }
+
+    public Builder sortOrder(SortOrder sortOrder) {
+      this.sortOrder = sortOrder;
+      return this;
+    }
+
+    public ParameterObject build() {
+      return new ParameterObject(this);
+    }
+  }
+}
--- a/parameter-object/src/main/java/com/iluwatar/parameter/object/SearchService.java
+++ b/parameter-object/src/main/java/com/iluwatar/parameter/object/SearchService.java
@ -0,0 +1,60 @@
+/*
+ * The MIT License
+ * Copyright © 2014-2021 Ilkka Seppälä
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+package com.iluwatar.parameter.object;
+
+public class SearchService {
+
+  /**
+   * Below two methods of name `search` is overloaded so that we can send a default value for
+   * one of the criteria and call the final api. A default SortOrder is sent in the first method
+   * and a default SortBy is sent in the second method. So two separate method definitions are
+   * needed for having default values for one argument in each case. Hence multiple overloaded
+   * methods are needed as the number of argument increases.
+   */
+  public String search(String type, String sortBy) {
+    return getQuerySummary(type, sortBy, SortOrder.ASC);
+  }
+
+  public String search(String type, SortOrder sortOrder) {
+    return getQuerySummary(type, "price", sortOrder);
+  }
+
+
+  /**
+   * The need for multiple method definitions can be avoided by the Parameter Object pattern.
+   * Below is the example where only one method is required and all the logic for having default
+   * values are abstracted into the Parameter Object at the time of object creation.
+   */
+  public String search(ParameterObject parameterObject) {
+    return getQuerySummary(parameterObject.getType(), parameterObject.getSortBy(),
+        parameterObject.getSortOrder());
+  }
+
+  private String getQuerySummary(String type, String sortBy, SortOrder sortOrder) {
+    return String.format("Requesting shoes of type \"%s\" sorted by \"%s\" in \"%sending\" order..",
+        type,
+        sortBy,
+        sortOrder.getValue());
+  }
+}
--- a/parameter-object/src/main/java/com/iluwatar/parameter/object/SortOrder.java
+++ b/parameter-object/src/main/java/com/iluwatar/parameter/object/SortOrder.java
@ -0,0 +1,39 @@
+/*
+ * The MIT License
+ * Copyright © 2014-2021 Ilkka Seppälä
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+package com.iluwatar.parameter.object;
+
+public enum SortOrder {
+  ASC("asc"),
+  DESC("desc");
+
+  private String value;
+
+  SortOrder(String value) {
+    this.value = value;
+  }
+
+  public String getValue() {
+    return value;
+  }
+}
--- a/parameter-object/src/test/java/com/iluwatar/parameter/object/AppTest.java
+++ b/parameter-object/src/test/java/com/iluwatar/parameter/object/AppTest.java
@ -0,0 +1,41 @@
+/*
+ * The MIT License
+ * Copyright © 2014-2021 Ilkka Seppälä
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+package com.iluwatar.parameter.object;
+
+import org.junit.jupiter.api.Test;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Application test
+ */
+class AppTest {
+  private static final Logger LOGGER = LoggerFactory.getLogger(AppTest.class);
+
+  @Test
+  void shouldExecuteApplicationWithoutException() {
+    App.main(new String[]{});
+    LOGGER.info("Executed successfully without exception.");
+  }
+}
--- a/parameter-object/src/test/java/com/iluwatar/parameter/object/ParameterObjectTest.java
+++ b/parameter-object/src/test/java/com/iluwatar/parameter/object/ParameterObjectTest.java
@ -0,0 +1,63 @@
+/*
+ * The MIT License
+ * Copyright © 2014-2021 Ilkka Seppälä
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+package com.iluwatar.parameter.object;
+
+import org.junit.jupiter.api.Test;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+class ParameterObjectTest {
+
+  private static final Logger LOGGER = LoggerFactory.getLogger(ParameterObjectTest.class);
+
+  @Test
+  public void testForDefaultSortBy() {
+    //Creating parameter object with default value for SortBy set
+    ParameterObject params = ParameterObject.newBuilder()
+        .withType("sneakers")
+        .sortOrder(SortOrder.DESC)
+        .build();
+
+    assertEquals(ParameterObject.DEFAULT_SORT_BY, params.getSortBy(),
+        "Default SortBy is not set.");
+    LOGGER.info("{} Default parameter value is set during object creation as no value is passed."
+        , "SortBy");
+  }
+
+  @Test
+  public void testForDefaultSortOrder() {
+    //Creating parameter object with default value for SortOrder set
+    ParameterObject params = ParameterObject.newBuilder()
+        .withType("sneakers")
+        .sortBy("brand")
+        .build();
+
+    assertEquals(ParameterObject.DEFAULT_SORT_ORDER, params.getSortOrder(),
+        "Default SortOrder is not set.");
+    LOGGER.info("{} Default parameter value is set during object creation as no value is passed."
+        , "SortOrder");
+  }
+}
--- a/parameter-object/src/test/java/com/iluwatar/parameter/object/SearchServiceTest.java
+++ b/parameter-object/src/test/java/com/iluwatar/parameter/object/SearchServiceTest.java
@ -0,0 +1,63 @@
+/*
+ * The MIT License
+ * Copyright © 2014-2021 Ilkka Seppälä
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+package com.iluwatar.parameter.object;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+class SearchServiceTest {
+  private static final Logger LOGGER = LoggerFactory.getLogger(SearchServiceTest.class);
+  private ParameterObject parameterObject;
+  private SearchService searchService;
+
+  @BeforeEach
+  public void setUp() {
+    //Creating parameter object with default values set
+    parameterObject = ParameterObject.newBuilder()
+        .withType("sneakers")
+        .build();
+
+    searchService = new SearchService();
+  }
+
+  /**
+   *  Testing parameter object against the overloaded method to verify if the behaviour is same.
+   */
+  @Test
+  public void testDefaultParametersMatch() {
+    assertEquals(searchService.search(parameterObject), searchService.search("sneakers",
+        SortOrder.ASC), "Default Parameter values do not not match.");
+    LOGGER.info("SortBy Default parameter value matches.");
+
+    assertEquals(searchService.search(parameterObject), searchService.search("sneakers",
+        "price"), "Default Parameter values do not not match.");
+    LOGGER.info("SortOrder Default parameter value matches.");
+
+    LOGGER.info("testDefaultParametersMatch executed successfully without errors.");
+  }
+}
--- a/partial-response/pom.xml
+++ b/partial-response/pom.xml
@ -35,12 +35,6 @@

    <artifactId>partial-response</artifactId>
    <dependencies>
-        <dependency>
-            <groupId>org.junit.vintage</groupId>
-            <artifactId>junit-vintage-engine</artifactId>
-            <version>5.4.0</version>
-            <scope>test</scope>
-        </dependency>
        <dependency>
            <groupId>org.mockito</groupId>
            <artifactId>mockito-junit-jupiter</artifactId>
--- a/partial-response/src/test/java/com/iluwatar/partialresponse/VideoResourceTest.java
+++ b/partial-response/src/test/java/com/iluwatar/partialresponse/VideoResourceTest.java
@ -23,17 +23,18 @@

 package com.iluwatar.partialresponse;

+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.eq;
+
+import java.util.Map;
 import org.junit.jupiter.api.Assertions;
-import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
-import org.mockito.Matchers;
 import org.mockito.Mock;
 import org.mockito.Mockito;
 import org.mockito.junit.jupiter.MockitoExtension;

-import java.util.Map;
-
 /**
 * tests {@link VideoResource}.
 */
@ -44,8 +45,8 @@ class VideoResourceTest {

  private static VideoResource resource;

-  @BeforeAll
-  static void setUp() {
+  @BeforeEach
+  void setUp() {
    var videos = Map.of(
        1, new Video(1, "Avatar", 178, "epic science fiction film",
            "James Cameron", "English"),
@ -70,7 +71,7 @@ class VideoResourceTest {
    var fields = new String[]{"id", "title", "length"};

    var expectedDetails = "{\"id\": 1,\"title\": \"Avatar\",\"length\": 178}";
-    Mockito.when(fieldJsonMapper.toJson(Matchers.any(Video.class), Matchers.eq(fields))).thenReturn(expectedDetails);
+    Mockito.when(fieldJsonMapper.toJson(any(Video.class), eq(fields))).thenReturn(expectedDetails);

    var actualFieldsDetails = resource.getDetails(2, fields);

--- a/pom.xml
+++ b/pom.xml
@ -41,11 +41,11 @@
        <spring-data.version>2.0.14.RELEASE</spring-data.version>
        <h2.version>1.4.190</h2.version>
        <junit.version>4.12</junit.version>
-        <junit-jupiter.version>5.5.2</junit-jupiter.version>
-        <junit-vintage.version>${junit.version}.2</junit-vintage.version>
+        <junit-jupiter.version>5.7.1</junit-jupiter.version>
+        <junit-vintage.version>${junit-jupiter.version}</junit-vintage.version>
        <sping-test-junit5.version>1.0.2</sping-test-junit5.version>
        <compiler.version>3.8.1</compiler.version>
-        <jacoco.version>0.8.4</jacoco.version>
+        <jacoco.version>0.8.6</jacoco.version>
        <commons-dbcp.version>1.4</commons-dbcp.version>
        <camel.version>2.24.0</camel.version>
        <guava.version>19.0</guava.version>
@ -208,6 +208,7 @@
        <module>factory</module>
        <module>separated-interface</module>
        <module>special-case</module>
+        <module>parameter-object</module>
    </modules>

    <repositories>
@ -273,12 +274,6 @@
                <artifactId>camel-stream</artifactId>
                <version>${camel.version}</version>
            </dependency>
-            <dependency>
-                <groupId>junit</groupId>
-                <artifactId>junit</artifactId>
-                <version>${junit.version}</version>
-                <scope>test</scope>
-            </dependency>
            <dependency>
                <groupId>org.junit.jupiter</groupId>
                <artifactId>junit-jupiter-api</artifactId>
--- a/producer-consumer/src/main/java/com/iluwatar/producer/consumer/Producer.java
+++ b/producer-consumer/src/main/java/com/iluwatar/producer/consumer/Producer.java
@ -23,7 +23,7 @@

 package com.iluwatar.producer.consumer;

-import java.util.Random;
+import java.security.SecureRandom;

 /**
 * Class responsible for producing unit of work that can be expressed as {@link Item} and submitted
@ -31,7 +31,7 @@ import java.util.Random;
 */
 public class Producer {

-  private static final Random RANDOM = new Random();
+  private static final SecureRandom RANDOM = new SecureRandom();

  private final ItemQueue queue;

--- a/registry/pom.xml
+++ b/registry/pom.xml
@ -41,10 +41,6 @@
      <artifactId>junit-jupiter-engine</artifactId>
      <scope>test</scope>
    </dependency>
-    <dependency>
-      <groupId>junit</groupId>
-      <artifactId>junit</artifactId>
-    </dependency>
  </dependencies>

  <build>
--- a/role-object/pom.xml
+++ b/role-object/pom.xml
@ -34,11 +34,6 @@

  <artifactId>role-object</artifactId>
  <dependencies>
-    <dependency>
-      <groupId>junit</groupId>
-      <artifactId>junit</artifactId>
-      <scope>test</scope>
-    </dependency>
    <dependency>
      <groupId>org.junit.jupiter</groupId>
      <artifactId>junit-jupiter-engine</artifactId>
--- a/role-object/src/test/java/com/iluwatar/roleobject/ApplicationRoleObjectTest.java
+++ b/role-object/src/test/java/com/iluwatar/roleobject/ApplicationRoleObjectTest.java
@ -23,14 +23,14 @@

 package com.iluwatar.roleobject;

-import org.junit.Test;
-
 import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;

-public class ApplicationRoleObjectTest {
+import org.junit.jupiter.api.Test;
+
+class ApplicationRoleObjectTest {

  @Test
-  public void shouldExecuteApplicationWithoutException() {
+  void shouldExecuteApplicationWithoutException() {
    assertDoesNotThrow(() -> ApplicationRoleObject.main(new String[]{}));
  }
 }
--- a/role-object/src/test/java/com/iluwatar/roleobject/BorrowerRoleTest.java
+++ b/role-object/src/test/java/com/iluwatar/roleobject/BorrowerRoleTest.java
@ -23,15 +23,16 @@

 package com.iluwatar.roleobject;

-import org.junit.Assert;
-import org.junit.Test;
+import static org.junit.jupiter.api.Assertions.assertEquals;

-public class BorrowerRoleTest {
+import org.junit.jupiter.api.Test;
+
+class BorrowerRoleTest {

  @Test
-  public void borrowTest() {
+  void borrowTest() {
    var borrowerRole = new BorrowerRole();
    borrowerRole.setName("test");
-    Assert.assertEquals(borrowerRole.borrow(), "Borrower test wants to get some money.");
+    assertEquals("Borrower test wants to get some money.", borrowerRole.borrow());
  }
 }
--- a/role-object/src/test/java/com/iluwatar/roleobject/CustomerCoreTest.java
+++ b/role-object/src/test/java/com/iluwatar/roleobject/CustomerCoreTest.java
@ -23,22 +23,22 @@

 package com.iluwatar.roleobject;

-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertFalse;
-import static org.junit.Assert.assertTrue;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;

-import org.junit.Test;
+import org.junit.jupiter.api.Test;

-public class CustomerCoreTest {
+class CustomerCoreTest {

  @Test
-  public void addRole() {
+  void addRole() {
    var core = new CustomerCore();
    assertTrue(core.addRole(Role.Borrower));
  }

  @Test
-  public void hasRole() {
+  void hasRole() {
    var core = new CustomerCore();
    core.addRole(Role.Borrower);
    assertTrue(core.hasRole(Role.Borrower));
@ -46,7 +46,7 @@ public class CustomerCoreTest {
  }

  @Test
-  public void remRole() {
+  void remRole() {
    var core = new CustomerCore();
    core.addRole(Role.Borrower);

@ -60,7 +60,7 @@ public class CustomerCoreTest {
  }

  @Test
-  public void getRole() {
+  void getRole() {
    var core = new CustomerCore();
    core.addRole(Role.Borrower);

@ -76,17 +76,17 @@ public class CustomerCoreTest {


  @Test
-  public void toStringTest() {
+  void toStringTest() {
    var core = new CustomerCore();
    core.addRole(Role.Borrower);
-    assertEquals(core.toString(), "Customer{roles=[Borrower]}");
+    assertEquals("Customer{roles=[Borrower]}", core.toString());

    core = new CustomerCore();
    core.addRole(Role.Investor);
-    assertEquals(core.toString(), "Customer{roles=[Investor]}");
+    assertEquals("Customer{roles=[Investor]}", core.toString());

    core = new CustomerCore();
-    assertEquals(core.toString(), "Customer{roles=[]}");
+    assertEquals("Customer{roles=[]}", core.toString());


  }
--- a/role-object/src/test/java/com/iluwatar/roleobject/InvestorRoleTest.java
+++ b/role-object/src/test/java/com/iluwatar/roleobject/InvestorRoleTest.java
@ -23,16 +23,17 @@

 package com.iluwatar.roleobject;

-import org.junit.Assert;
-import org.junit.Test;
+import static org.junit.jupiter.api.Assertions.assertEquals;

-public class InvestorRoleTest {
+import org.junit.jupiter.api.Test;
+
+class InvestorRoleTest {

  @Test
-  public void investTest() {
+  void investTest() {
    var investorRole = new InvestorRole();
    investorRole.setName("test");
    investorRole.setAmountToInvest(10);
-    Assert.assertEquals(investorRole.invest(), "Investor test has invested 10 dollars");
+    assertEquals("Investor test has invested 10 dollars", investorRole.invest());
  }
 }
--- a/role-object/src/test/java/com/iluwatar/roleobject/RoleTest.java
+++ b/role-object/src/test/java/com/iluwatar/roleobject/RoleTest.java
@ -23,15 +23,17 @@

 package com.iluwatar.roleobject;

-import org.junit.Assert;
-import org.junit.Test;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;

-public class RoleTest {
+import org.junit.jupiter.api.Test;
+
+class RoleTest {

  @Test
-  public void instanceTest() {
+  void instanceTest() {
    var instance = Role.Borrower.instance();
-    Assert.assertTrue(instance.isPresent());
-    Assert.assertEquals(instance.get().getClass(), BorrowerRole.class);
+    assertTrue(instance.isPresent());
+    assertEquals(instance.get().getClass(), BorrowerRole.class);
  }
 }
--- a/saga/pom.xml
+++ b/saga/pom.xml
@ -35,11 +35,6 @@

    <artifactId>saga</artifactId>
    <dependencies>
-        <dependency>
-            <groupId>junit</groupId>
-            <artifactId>junit</artifactId>
-            <scope>test</scope>
-        </dependency>
        <dependency>
            <groupId>org.junit.jupiter</groupId>
            <artifactId>junit-jupiter-engine</artifactId>
--- a/saga/src/test/java/com/iluwatar/saga/choreography/SagaApplicationTest.java
+++ b/saga/src/test/java/com/iluwatar/saga/choreography/SagaApplicationTest.java
@ -23,18 +23,19 @@

 package com.iluwatar.saga.choreography;

-import com.iluwatar.saga.orchestration.SagaApplication;
-import org.junit.Test;
-
 import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;

+import com.iluwatar.saga.orchestration.SagaApplication;
+import org.junit.jupiter.api.Test;
+

 /***
 * empty test
 */
-public class SagaApplicationTest {
+class SagaApplicationTest {
+
  @Test
-  public void shouldExecuteWithoutException() {
+  void shouldExecuteWithoutException() {
    assertDoesNotThrow(() -> SagaApplication.main(new String[]{}));
  }
-}
+}
--- a/saga/src/test/java/com/iluwatar/saga/choreography/SagaChoreographyTest.java
+++ b/saga/src/test/java/com/iluwatar/saga/choreography/SagaChoreographyTest.java
@ -23,24 +23,25 @@

 package com.iluwatar.saga.choreography;

-import org.junit.Assert;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;

 /**
 * test to check choreography saga
 */
-public class SagaChoreographyTest {
+class SagaChoreographyTest {


  @Test
-  public void executeTest() {
+  void executeTest() {
    var sd = serviceDiscovery();
    var service = sd.findAny();
    var badOrderSaga = service.execute(newSaga("bad_order"));
    var goodOrderSaga = service.execute(newSaga("good_order"));

-    Assert.assertEquals(badOrderSaga.getResult(), Saga.SagaResult.ROLLBACKED);
-    Assert.assertEquals(goodOrderSaga.getResult(), Saga.SagaResult.FINISHED);
+    assertEquals(Saga.SagaResult.ROLLBACKED, badOrderSaga.getResult());
+    assertEquals(Saga.SagaResult.FINISHED, goodOrderSaga.getResult());
  }

  private static Saga newSaga(Object value) {
--- a/saga/src/test/java/com/iluwatar/saga/orchestration/SagaApplicationTest.java
+++ b/saga/src/test/java/com/iluwatar/saga/orchestration/SagaApplicationTest.java
@ -23,15 +23,15 @@

 package com.iluwatar.saga.orchestration;

-import org.junit.Test;
+import org.junit.jupiter.api.Test;

 /**
 * empty test
 */
-public class SagaApplicationTest {
+class SagaApplicationTest {

  @Test
-  public void mainTest() {
+  void mainTest() {
    SagaApplication.main(new String[]{});
  }
-}
+}
--- a/saga/src/test/java/com/iluwatar/saga/orchestration/SagaOrchestratorInternallyTest.java
+++ b/saga/src/test/java/com/iluwatar/saga/orchestration/SagaOrchestratorInternallyTest.java
@ -23,28 +23,30 @@

 package com.iluwatar.saga.orchestration;

+import org.junit.jupiter.api.Test;
+
 import static com.iluwatar.saga.orchestration.Saga.Result;
+import static org.junit.jupiter.api.Assertions.assertArrayEquals;
+import static org.junit.jupiter.api.Assertions.assertEquals;

 import java.util.ArrayList;
 import java.util.List;
-import org.junit.Assert;
-import org.junit.Test;

 /**
 * test to test orchestration logic
 */
-public class SagaOrchestratorInternallyTest {
+class SagaOrchestratorInternallyTest {

  private final List<String> records = new ArrayList<>();

  @Test
-  public void executeTest() {
+  void executeTest() {
    var sagaOrchestrator = new SagaOrchestrator(newSaga(), serviceDiscovery());
    var result = sagaOrchestrator.execute(1);
-    Assert.assertEquals(result, Result.ROLLBACK);
-    Assert.assertArrayEquals(
-        records.toArray(new String[]{}),
-        new String[]{"+1", "+2", "+3", "+4", "-4", "-3", "-2", "-1"});
+    assertEquals(Result.ROLLBACK, result);
+    assertArrayEquals(
+            new String[]{"+1", "+2", "+3", "+4", "-4", "-3", "-2", "-1"},
+            records.toArray(new String[]{}));
  }

  private static Saga newSaga() {
--- a/saga/src/test/java/com/iluwatar/saga/orchestration/SagaOrchestratorTest.java
+++ b/saga/src/test/java/com/iluwatar/saga/orchestration/SagaOrchestratorTest.java
@ -23,22 +23,23 @@

 package com.iluwatar.saga.orchestration;

-import org.junit.Assert;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;

 /**
 * test to check general logic
 */
-public class SagaOrchestratorTest {
+class SagaOrchestratorTest {

  @Test
-  public void execute() {
+  void execute() {
    SagaOrchestrator sagaOrchestrator = new SagaOrchestrator(newSaga(), serviceDiscovery());
    Saga.Result badOrder = sagaOrchestrator.execute("bad_order");
    Saga.Result crashedOrder = sagaOrchestrator.execute("crashed_order");

-    Assert.assertEquals(badOrder, Saga.Result.ROLLBACK);
-    Assert.assertEquals(crashedOrder, Saga.Result.CRASHED);
+    assertEquals(Saga.Result.ROLLBACK, badOrder);
+    assertEquals(Saga.Result.CRASHED, crashedOrder);
  }

  private static Saga newSaga() {
--- a/serverless/src/test/java/com/iluwatar/serverless/faas/api/LambdaInfoApiHandlerTest.java
+++ b/serverless/src/test/java/com/iluwatar/serverless/faas/api/LambdaInfoApiHandlerTest.java
@ -30,17 +30,14 @@ import static org.mockito.Mockito.when;

 import com.amazonaws.services.lambda.runtime.Context;
 import org.junit.jupiter.api.Test;
-import org.junit.runner.RunWith;
-import org.mockito.runners.MockitoJUnitRunner;

 /**
 * Unit tests for LambdaInfoApiHandler
 */
-@RunWith(MockitoJUnitRunner.class)
-public class LambdaInfoApiHandlerTest {
+class LambdaInfoApiHandlerTest {

  @Test
-  public void handleRequestWithMockContext() {
+  void handleRequestWithMockContext() {
    var lambdaInfoApiHandler = new LambdaInfoApiHandler();
    var context = mock(Context.class);
    when(context.getAwsRequestId()).thenReturn("mock aws request id");
--- a/sharding/pom.xml
+++ b/sharding/pom.xml
@ -36,10 +36,6 @@
    <artifactId>sharding</artifactId>

    <dependencies>
-        <dependency>
-            <groupId>junit</groupId>
-            <artifactId>junit</artifactId>
-        </dependency>
        <dependency>
            <groupId>org.junit.jupiter</groupId>
            <artifactId>junit-jupiter-engine</artifactId>
--- a/sharding/src/main/java/com/iluwatar/sharding/LookupShardManager.java
+++ b/sharding/src/main/java/com/iluwatar/sharding/LookupShardManager.java
@ -23,9 +23,9 @@

 package com.iluwatar.sharding;

+import java.security.SecureRandom;
 import java.util.HashMap;
 import java.util.Map;
-import java.util.Random;

 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@ -58,7 +58,7 @@ public class LookupShardManager extends ShardManager {
      return lookupMap.get(key);
    } else {
      var shardCount = shardMap.size();
-      return new Random().nextInt(shardCount - 1) + 1;
+      return new SecureRandom().nextInt(shardCount - 1) + 1;
    }
  }

--- a/sharding/src/test/java/com/iluwatar/sharding/AppTest.java
+++ b/sharding/src/test/java/com/iluwatar/sharding/AppTest.java
@ -23,17 +23,17 @@

 package com.iluwatar.sharding;

-import org.junit.Test;
-
 import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;

+import org.junit.jupiter.api.Test;
+
 /**
 * Unit tests for App class.
 */
-public class AppTest {
+class AppTest {

  @Test
-  public void shouldExecuteWithoutException() {
+  void shouldExecuteWithoutException() {
    assertDoesNotThrow(() -> App.main(new String[]{}));
  }

--- a/sharding/src/test/java/com/iluwatar/sharding/HashShardManagerTest.java
+++ b/sharding/src/test/java/com/iluwatar/sharding/HashShardManagerTest.java
@ -23,22 +23,22 @@

 package com.iluwatar.sharding;

-import org.junit.After;
-import org.junit.Assert;
-import org.junit.Before;
-import org.junit.Test;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;

 /**
 * Unit tests for HashShardManager class.
 */
-public class HashShardManagerTest {
+class HashShardManagerTest {

  private HashShardManager hashShardManager;

  /**
   * Initialize hashShardManager instance.
   */
-  @Before
+  @BeforeEach
  public void setup() {
    hashShardManager = new HashShardManager();
    var shard1 = new Shard(1);
@ -49,16 +49,11 @@ public class HashShardManagerTest {
    hashShardManager.addNewShard(shard3);
  }

-  @After
-  public void tearDown() {
-
-  }
-
  @Test
-  public void testStoreData() {
+  void testStoreData() {
    var data = new Data(1, "test", Data.DataType.TYPE_1);
    hashShardManager.storeData(data);
-    Assert.assertEquals(data, hashShardManager.getShardById(1).getDataById(1));
+    assertEquals(data, hashShardManager.getShardById(1).getDataById(1));
  }

 }
--- a/sharding/src/test/java/com/iluwatar/sharding/LookupShardManagerTest.java
+++ b/sharding/src/test/java/com/iluwatar/sharding/LookupShardManagerTest.java
@ -23,22 +23,24 @@

 package com.iluwatar.sharding;

+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.fail;
+
 import java.util.Map;
-import org.junit.Assert;
-import org.junit.Before;
-import org.junit.Test;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;

 /**
 * Unit tests for LookupShardManager class.
 */
-public class LookupShardManagerTest {
+class LookupShardManagerTest {

  private LookupShardManager lookupShardManager;

  /**
   * Initialize lookupShardManager instance.
   */
-  @Before
+  @BeforeEach
  public void setup() {
    lookupShardManager = new LookupShardManager();
    var shard1 = new Shard(1);
@ -50,7 +52,7 @@ public class LookupShardManagerTest {
  }

  @Test
-  public void testStoreData() {
+  void testStoreData() {
    try {
      var data = new Data(1, "test", Data.DataType.TYPE_1);
      lookupShardManager.storeData(data);
@ -59,9 +61,9 @@ public class LookupShardManagerTest {
      var lookupMap = (Map<Integer, Integer>) field.get(lookupShardManager);
      var shardId = lookupMap.get(1);
      var shard = lookupShardManager.getShardById(shardId);
-      Assert.assertEquals(data, shard.getDataById(1));
+      assertEquals(data, shard.getDataById(1));
    } catch (NoSuchFieldException | IllegalAccessException e) {
-      Assert.fail("Fail to modify field access.");
+      fail("Fail to modify field access.");
    }
  }
 }
--- a/sharding/src/test/java/com/iluwatar/sharding/RangeShardManagerTest.java
+++ b/sharding/src/test/java/com/iluwatar/sharding/RangeShardManagerTest.java
@ -23,21 +23,22 @@

 package com.iluwatar.sharding;

-import org.junit.Assert;
-import org.junit.Before;
-import org.junit.Test;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;

 /**
 * Unit tests for RangeShardManager class.
 */
-public class RangeShardManagerTest {
+class RangeShardManagerTest {

  private RangeShardManager rangeShardManager;

  /**
   * Initialize rangeShardManager instance.
   */
-  @Before
+  @BeforeEach
  public void setup() {
    rangeShardManager = new RangeShardManager();
    var shard1 = new Shard(1);
@ -49,10 +50,10 @@ public class RangeShardManagerTest {
  }

  @Test
-  public void testStoreData() {
+  void testStoreData() {
    var data = new Data(1, "test", Data.DataType.TYPE_1);
    rangeShardManager.storeData(data);
-    Assert.assertEquals(data, rangeShardManager.getShardById(1).getDataById(1));
+    assertEquals(data, rangeShardManager.getShardById(1).getDataById(1));
  }

 }
--- a/sharding/src/test/java/com/iluwatar/sharding/ShardManagerTest.java
+++ b/sharding/src/test/java/com/iluwatar/sharding/ShardManagerTest.java
@ -23,49 +23,46 @@

 package com.iluwatar.sharding;

+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.junit.jupiter.api.Assertions.fail;
+
 import java.util.Map;
-import org.junit.After;
-import org.junit.Assert;
-import org.junit.Before;
-import org.junit.Test;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;

 /**
 * Unit tests for ShardManager class.
 */
-public class ShardManagerTest {
+class ShardManagerTest {

  private ShardManager shardManager;

  /**
   * Initialize shardManager instance.
   */
-  @Before
-  public void setup() {
+  @BeforeEach
+  void setup() {
    shardManager = new TestShardManager();
  }

-  @After
-  public void tearDown() {
-
-  }
-
  @Test
-  public void testAddNewShard() {
+  void testAddNewShard() {
    try {
      var shard = new Shard(1);
      shardManager.addNewShard(shard);
      var field = ShardManager.class.getDeclaredField("shardMap");
      field.setAccessible(true);
      var map = (Map<Integer, Shard>) field.get(shardManager);
-      Assert.assertEquals(1, map.size());
-      Assert.assertEquals(shard, map.get(1));
+      assertEquals(1, map.size());
+      assertEquals(shard, map.get(1));
    } catch (NoSuchFieldException | IllegalAccessException e) {
-      Assert.fail("Fail to modify field access.");
+      fail("Fail to modify field access.");
    }
  }

  @Test
-  public void testRemoveShardById() {
+  void testRemoveShardById() {
    try {
      var shard = new Shard(1);
      shardManager.addNewShard(shard);
@ -73,19 +70,19 @@ public class ShardManagerTest {
      var field = ShardManager.class.getDeclaredField("shardMap");
      field.setAccessible(true);
      var map = (Map<Integer, Shard>) field.get(shardManager);
-      Assert.assertEquals(true, flag);
-      Assert.assertEquals(0, map.size());
+      assertTrue(flag);
+      assertEquals(0, map.size());
    } catch (IllegalAccessException | NoSuchFieldException e) {
-      Assert.fail("Fail to modify field access.");
+      fail("Fail to modify field access.");
    }
  }

  @Test
-  public void testGetShardById() {
+  void testGetShardById() {
    var shard = new Shard(1);
    shardManager.addNewShard(shard);
    var tmpShard = shardManager.getShardById(1);
-    Assert.assertEquals(shard, tmpShard);
+    assertEquals(shard, tmpShard);
  }

  class TestShardManager extends ShardManager {
--- a/sharding/src/test/java/com/iluwatar/sharding/ShardTest.java
+++ b/sharding/src/test/java/com/iluwatar/sharding/ShardTest.java
@ -23,50 +23,47 @@

 package com.iluwatar.sharding;

+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.fail;
+
 import java.util.HashMap;
 import java.util.Map;
-import org.junit.After;
-import org.junit.Assert;
-import org.junit.Before;
-import org.junit.Test;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;


 /**
 * Unit tests for Shard class.
 */
-public class ShardTest {
+class ShardTest {

  private Data data;

  private Shard shard;

-  @Before
+  @BeforeEach
  public void setup() {
    data = new Data(1, "test", Data.DataType.TYPE_1);
    shard = new Shard(1);
  }

-  @After
-  public void tearDown() {
-  }
-
  @Test
-  public void testStoreData() {
+  void testStoreData() {
    try {
      shard.storeData(data);
      var field = Shard.class.getDeclaredField("dataStore");
      field.setAccessible(true);
      var dataMap = (Map<Integer, Data>) field.get(shard);
-      Assert.assertEquals(1, dataMap.size());
-      Assert.assertEquals(data, dataMap.get(1));
+      assertEquals(1, dataMap.size());
+      assertEquals(data, dataMap.get(1));
    } catch (NoSuchFieldException | IllegalAccessException e) {
-      Assert.fail("Fail to modify field access.");
+      fail("Fail to modify field access.");
    }

  }

  @Test
-  public void testClearData() {
+  void testClearData() {
    try {
      var dataMap = new HashMap<Integer, Data>();
      dataMap.put(1, data);
@ -75,9 +72,9 @@ public class ShardTest {
      field.set(shard, dataMap);
      shard.clearData();
      dataMap = (HashMap<Integer, Data>) field.get(shard);
-      Assert.assertEquals(0, dataMap.size());
+      assertEquals(0, dataMap.size());
    } catch (NoSuchFieldException | IllegalAccessException e) {
-      Assert.fail("Fail to modify field access.");
+      fail("Fail to modify field access.");
    }
  }
 }
--- a/singleton/pom.xml
+++ b/singleton/pom.xml
@ -38,10 +38,6 @@
      <artifactId>junit-jupiter-engine</artifactId>
      <scope>test</scope>
    </dependency>
-    <dependency>
-      <groupId>junit</groupId>
-      <artifactId>junit</artifactId>
-    </dependency>
  </dependencies>
  <build>
    <plugins>
--- a/singleton/src/test/java/com/iluwatar/singleton/ThreadSafeDoubleCheckLockingTest.java
+++ b/singleton/src/test/java/com/iluwatar/singleton/ThreadSafeDoubleCheckLockingTest.java
@ -23,15 +23,17 @@

 package com.iluwatar.singleton;

+import static org.junit.jupiter.api.Assertions.assertThrows;
+
 import java.lang.reflect.InvocationTargetException;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;

 /**
 * Date: 12/29/15 - 19:26 PM.
 *
 * @author Jeroen Meulemeester
 */
-public class ThreadSafeDoubleCheckLockingTest extends SingletonTest<ThreadSafeDoubleCheckLocking> {
+class ThreadSafeDoubleCheckLockingTest extends SingletonTest<ThreadSafeDoubleCheckLocking> {

  /**
   * Create a new singleton test instance using the given 'getInstance' method.
@ -43,12 +45,12 @@ public class ThreadSafeDoubleCheckLockingTest extends SingletonTest<ThreadSafeDo
  /**
   * Test creating new instance by refection.
   */
-  @Test(expected = InvocationTargetException.class)
-  public void testCreatingNewInstanceByRefection() throws Exception {
+  @Test
+  void testCreatingNewInstanceByRefection() throws Exception {
    ThreadSafeDoubleCheckLocking.getInstance();
    var constructor = ThreadSafeDoubleCheckLocking.class.getDeclaredConstructor();
    constructor.setAccessible(true);
-    constructor.newInstance((Object[]) null);
+    assertThrows(InvocationTargetException.class, () -> constructor.newInstance((Object[]) null));
  }

 }
--- a/spatial-partition/src/main/java/com/iluwatar/spatialpartition/App.java
+++ b/spatial-partition/src/main/java/com/iluwatar/spatialpartition/App.java
@ -23,8 +23,8 @@

 package com.iluwatar.spatialpartition;

+import java.security.SecureRandom;
 import java.util.HashMap;
-import java.util.Random;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;

@ -112,7 +112,7 @@ public class App {
  public static void main(String[] args) {
    var bubbles1 = new HashMap<Integer, Bubble>();
    var bubbles2 = new HashMap<Integer, Bubble>();
-    var rand = new Random();
+    var rand = new SecureRandom();
    for (int i = 0; i < 10000; i++) {
      var b = new Bubble(rand.nextInt(300), rand.nextInt(300), i, rand.nextInt(2) + 1);
      bubbles1.put(i, b);
--- a/spatial-partition/src/main/java/com/iluwatar/spatialpartition/Bubble.java
+++ b/spatial-partition/src/main/java/com/iluwatar/spatialpartition/Bubble.java
@ -23,9 +23,9 @@

 package com.iluwatar.spatialpartition;

+import java.security.SecureRandom;
 import java.util.Collection;
 import java.util.HashMap;
-import java.util.Random;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;

@ -36,7 +36,7 @@ import org.slf4j.LoggerFactory;

 public class Bubble extends Point<Bubble> {
  private static final Logger LOGGER = LoggerFactory.getLogger(Bubble.class);
-  private static final Random RANDOM = new Random();
+  private static final SecureRandom RANDOM = new SecureRandom();

  final int radius;

--- a/subclass-sandbox/pom.xml
+++ b/subclass-sandbox/pom.xml
@ -36,10 +36,6 @@
    <artifactId>subclass-sandbox</artifactId>

    <dependencies>
-        <dependency>
-            <groupId>junit</groupId>
-            <artifactId>junit</artifactId>
-        </dependency>
        <dependency>
            <groupId>com.github.stefanbirkner</groupId>
            <artifactId>system-lambda</artifactId>
--- a/subclass-sandbox/src/test/java/com/iluwatar/subclasssandbox/AppTest.java
+++ b/subclass-sandbox/src/test/java/com/iluwatar/subclasssandbox/AppTest.java
@ -23,17 +23,17 @@

 package com.iluwatar.subclasssandbox;

-import org.junit.Test;
-
 import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;

+import org.junit.jupiter.api.Test;
+
 /**
 * App unit tests.
 */
-public class AppTest {
+class AppTest {

  @Test
-  public void shouldExecuteWithoutException() {
+  void shouldExecuteWithoutException() {
    assertDoesNotThrow(() -> App.main(new String[]{}));
  }
 }
--- a/subclass-sandbox/src/test/java/com/iluwatar/subclasssandbox/GroundDiveTest.java
+++ b/subclass-sandbox/src/test/java/com/iluwatar/subclasssandbox/GroundDiveTest.java
@ -23,45 +23,45 @@

 package com.iluwatar.subclasssandbox;

-import com.github.stefanbirkner.systemlambda.Statement;
-import org.junit.Assert;
-import org.junit.Test;
-
 import static com.github.stefanbirkner.systemlambda.SystemLambda.tapSystemOutNormalized;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import com.github.stefanbirkner.systemlambda.Statement;
+import org.junit.jupiter.api.Test;

 /**
 * GroundDive unit tests.
 */
-public class GroundDiveTest {
+class GroundDiveTest {

  @Test
-  public void testMove() throws Exception {
+  void testMove() throws Exception {
    var groundDive = new GroundDive();
    groundDive.move(1.0, 1.0, 1.0);
    var outputLog = getLogContent(() -> groundDive.move(1.0, 1.0, 1.0));
    var expectedLog = "Move to ( 1.0, 1.0, 1.0 )";
-    Assert.assertEquals(outputLog, expectedLog);
+    assertEquals(outputLog, expectedLog);
  }

  @Test
-  public void testPlaySound() throws Exception {
+  void testPlaySound() throws Exception {
    var groundDive = new GroundDive();
    var outputLog = getLogContent(() -> groundDive.playSound("SOUND_NAME", 1));
    var expectedLog = "Play SOUND_NAME with volumn 1";
-    Assert.assertEquals(outputLog, expectedLog);
+    assertEquals(outputLog, expectedLog);
  }

  @Test
-  public void testSpawnParticles() throws Exception {
+  void testSpawnParticles() throws Exception {
    var groundDive = new GroundDive();
    final var outputLog = getLogContent(
            () -> groundDive.spawnParticles("PARTICLE_TYPE", 100));
    final var expectedLog = "Spawn 100 particle with type PARTICLE_TYPE";
-    Assert.assertEquals(outputLog, expectedLog);
+    assertEquals(outputLog, expectedLog);
  }

  @Test
-  public void testActivate() throws Exception {
+  void testActivate() throws Exception {
    var groundDive = new GroundDive();
    var logs = tapSystemOutNormalized(groundDive::activate)
            .split("\n");
@ -72,10 +72,10 @@ public class GroundDiveTest {
    final var expectedLog2 = "Play GROUNDDIVE_SOUND with volumn 5";
    final var log3 = getLogContent(logs[2]);
    final var expectedLog3 = "Spawn 20 particle with type GROUNDDIVE_PARTICLE";
-    Assert.assertEquals(logs.length, expectedSize);
-    Assert.assertEquals(log1, expectedLog1);
-    Assert.assertEquals(log2, expectedLog2);
-    Assert.assertEquals(log3, expectedLog3);
+    assertEquals(logs.length, expectedSize);
+    assertEquals(log1, expectedLog1);
+    assertEquals(log2, expectedLog2);
+    assertEquals(log3, expectedLog3);
  }

  private String getLogContent(Statement statement) throws Exception {
--- a/subclass-sandbox/src/test/java/com/iluwatar/subclasssandbox/SkyLaunchTest.java
+++ b/subclass-sandbox/src/test/java/com/iluwatar/subclasssandbox/SkyLaunchTest.java
@ -23,44 +23,44 @@

 package com.iluwatar.subclasssandbox;

-import com.github.stefanbirkner.systemlambda.Statement;
-import org.junit.Assert;
-import org.junit.Test;
-
 import static com.github.stefanbirkner.systemlambda.SystemLambda.tapSystemOutNormalized;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import com.github.stefanbirkner.systemlambda.Statement;
+import org.junit.jupiter.api.Test;

 /**
 * SkyLaunch unit tests.
 */
-public class SkyLaunchTest {
+class SkyLaunchTest {

  @Test
-  public void testMove() throws Exception {
+  void testMove() throws Exception {
    var skyLaunch = new SkyLaunch();
    var outputLog = getLogContent(() -> skyLaunch.move(1.0, 1.0, 1.0));
    var expectedLog = "Move to ( 1.0, 1.0, 1.0 )";
-    Assert.assertEquals(outputLog, expectedLog);
+    assertEquals(outputLog, expectedLog);
  }

  @Test
-  public void testPlaySound() throws Exception {
+  void testPlaySound() throws Exception {
    var skyLaunch = new SkyLaunch();
    var outputLog = getLogContent(() -> skyLaunch.playSound("SOUND_NAME", 1));
    var expectedLog = "Play SOUND_NAME with volumn 1";
-    Assert.assertEquals(outputLog, expectedLog);
+    assertEquals(outputLog, expectedLog);
  }

  @Test
-  public void testSpawnParticles() throws Exception {
+  void testSpawnParticles() throws Exception {
    var skyLaunch = new SkyLaunch();
    var outputLog = getLogContent(
            () -> skyLaunch.spawnParticles("PARTICLE_TYPE", 100));
    var expectedLog = "Spawn 100 particle with type PARTICLE_TYPE";
-    Assert.assertEquals(outputLog, expectedLog);
+    assertEquals(outputLog, expectedLog);
  }

  @Test
-  public void testActivate() throws Exception {
+  void testActivate() throws Exception {
    var skyLaunch = new SkyLaunch();
    var logs = tapSystemOutNormalized(skyLaunch::activate)
            .split("\n");
@ -71,10 +71,10 @@ public class SkyLaunchTest {
    final var expectedLog2 = "Play SKYLAUNCH_SOUND with volumn 1";
    final var log3 = getLogContent(logs[2]);
    final var expectedLog3 = "Spawn 100 particle with type SKYLAUNCH_PARTICLE";
-    Assert.assertEquals(logs.length, expectedSize);
-    Assert.assertEquals(log1, expectedLog1);
-    Assert.assertEquals(log2, expectedLog2);
-    Assert.assertEquals(log3, expectedLog3);
+    assertEquals(logs.length, expectedSize);
+    assertEquals(log1, expectedLog1);
+    assertEquals(log2, expectedLog2);
+    assertEquals(log3, expectedLog3);
  }

  private String getLogContent(Statement statement) throws Exception {
--- a/tolerant-reader/pom.xml
+++ b/tolerant-reader/pom.xml
@ -38,11 +38,6 @@
      <artifactId>junit-jupiter-engine</artifactId>
      <scope>test</scope>
    </dependency>
-    <dependency>
-      <groupId>org.junit.jupiter</groupId>
-      <artifactId>junit-jupiter-migrationsupport</artifactId>
-      <scope>test</scope>
-    </dependency>
  </dependencies>
  <build>
    <plugins>
--- a/tolerant-reader/src/main/java/com/iluwatar/tolerantreader/RainbowFishSerializer.java
+++ b/tolerant-reader/src/main/java/com/iluwatar/tolerantreader/RainbowFishSerializer.java
@ -68,7 +68,7 @@ public final class RainbowFishSerializer {
    var map = Map.of(
        "name", rainbowFish.getName(),
        "age", String.format("%d", rainbowFish.getAge()),
-            "lengthMeters", String.format("%d", rainbowFish.getLengthMeters()),
+            LENGTH_METERS, String.format("%d", rainbowFish.getLengthMeters()),
            WEIGHT_TONS, String.format("%d", rainbowFish.getWeightTons()),
        "angry", Boolean.toString(rainbowFish.getAngry()),
        "hungry", Boolean.toString(rainbowFish.getHungry()),
@ -95,7 +95,7 @@ public final class RainbowFishSerializer {
    return new RainbowFish(
        map.get("name"),
        Integer.parseInt(map.get("age")),
-        Integer.parseInt(map.get("lengthMeters")),
+        Integer.parseInt(map.get(LENGTH_METERS)),
        Integer.parseInt(map.get(WEIGHT_TONS))
    );
  }
--- a/tolerant-reader/src/test/java/com/iluwatar/tolerantreader/AppTest.java
+++ b/tolerant-reader/src/test/java/com/iluwatar/tolerantreader/AppTest.java
@ -23,14 +23,13 @@

 package com.iluwatar.tolerantreader;

+import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
+
 import java.io.File;
-import java.io.IOException;
 import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;

-import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
-
 /**
 * Application test
 */
--- a/tolerant-reader/src/test/java/com/iluwatar/tolerantreader/RainbowFishSerializerTest.java
+++ b/tolerant-reader/src/test/java/com/iluwatar/tolerantreader/RainbowFishSerializerTest.java
@ -25,26 +25,32 @@ package com.iluwatar.tolerantreader;

 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertNotSame;
+import static org.junit.jupiter.api.Assertions.assertTrue;

-import java.io.File;
-import org.junit.Rule;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
-import org.junit.jupiter.migrationsupport.rules.EnableRuleMigrationSupport;
-import org.junit.rules.TemporaryFolder;
+import org.junit.jupiter.api.io.TempDir;

 /**
 * Date: 12/30/15 - 18:39 PM
 *
 * @author Jeroen Meulemeester
 */
-@EnableRuleMigrationSupport
-public class RainbowFishSerializerTest {
+
+class RainbowFishSerializerTest {

  /**
   * Create a temporary folder, used to generate files in during this test
   */
-  @Rule
-  public final TemporaryFolder testFolder = new TemporaryFolder();
+  @TempDir
+  static Path testFolder;
+
+  @BeforeEach
+  void beforeEach() {
+    assertTrue(Files.isDirectory(testFolder));
+  }

  /**
   * Rainbow fish version 1 used during the tests
@ -60,11 +66,11 @@ public class RainbowFishSerializerTest {
   * Verify if a fish, written as version 1 can be read back as version 1
   */
  @Test
-  public void testWriteV1ReadV1() throws Exception {
-    final var outputFile = this.testFolder.newFile();
-    RainbowFishSerializer.writeV1(V1, outputFile.getPath());
+  void testWriteV1ReadV1() throws Exception {
+    final var outputPath = Files.createFile(testFolder.resolve("outputFile"));
+    RainbowFishSerializer.writeV1(V1, outputPath.toString());

-    final var fish = RainbowFishSerializer.readV1(outputFile.getPath());
+    final var fish = RainbowFishSerializer.readV1(outputPath.toString());
    assertNotSame(V1, fish);
    assertEquals(V1.getName(), fish.getName());
    assertEquals(V1.getAge(), fish.getAge());
@ -77,11 +83,11 @@ public class RainbowFishSerializerTest {
   * Verify if a fish, written as version 2 can be read back as version 1
   */
  @Test
-  public void testWriteV2ReadV1() throws Exception {
-    final var outputFile = this.testFolder.newFile();
-    RainbowFishSerializer.writeV2(V2, outputFile.getPath());
+  void testWriteV2ReadV1() throws Exception {
+    final var outputPath = Files.createFile(testFolder.resolve("outputFile2"));
+    RainbowFishSerializer.writeV2(V2, outputPath.toString());

-    final var fish = RainbowFishSerializer.readV1(outputFile.getPath());
+    final var fish = RainbowFishSerializer.readV1(outputPath.toString());
    assertNotSame(V2, fish);
    assertEquals(V2.getName(), fish.getName());
    assertEquals(V2.getAge(), fish.getAge());
@ -89,4 +95,4 @@ public class RainbowFishSerializerTest {
    assertEquals(V2.getWeightTons(), fish.getWeightTons());
  }

-}
+}
--- a/tolerant-reader/src/test/java/com/iluwatar/tolerantreader/RainbowFishTest.java
+++ b/tolerant-reader/src/test/java/com/iluwatar/tolerantreader/RainbowFishTest.java
@ -23,22 +23,22 @@

 package com.iluwatar.tolerantreader;

-import static org.junit.Assert.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertEquals;

-import org.junit.Test;
+import org.junit.jupiter.api.Test;

 /**
 * Date: 12/30/15 - 18:34 PM
 *
 * @author Jeroen Meulemeester
 */
-public class RainbowFishTest {
+class RainbowFishTest {

  /**
   * Verify if the getters of a {@link RainbowFish} return the expected values
   */
  @Test
-  public void testValues() {
+  void testValues() {
    final var fish = new RainbowFish("name", 1, 2, 3);
    assertEquals("name", fish.getName());
    assertEquals(1, fish.getAge());
--- a/tolerant-reader/src/test/java/com/iluwatar/tolerantreader/RainbowFishV2Test.java
+++ b/tolerant-reader/src/test/java/com/iluwatar/tolerantreader/RainbowFishV2Test.java
@ -27,20 +27,20 @@ import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertFalse;
 import static org.junit.jupiter.api.Assertions.assertTrue;

-import org.junit.Test;
+import org.junit.jupiter.api.Test;

 /**
 * Date: 12/30/15 - 18:35 PM
 *
 * @author Jeroen Meulemeester
 */
-public class RainbowFishV2Test {
+class RainbowFishV2Test {

  /**
   * Verify if the getters of a {@link RainbowFish} return the expected values
   */
  @Test
-  public void testValues() {
+  void testValues() {
    final var fish = new RainbowFishV2("name", 1, 2, 3, false, true, false);
    assertEquals("name", fish.getName());
    assertEquals(1, fish.getAge());
--- a/tr/singleton/README.md
+++ b/tr/singleton/README.md
@ -0,0 +1,87 @@
+---
+layout: pattern
+title: Singleton
+folder: singleton
+permalink: /patterns/singleton/
+categories: Creational
+tags:
+- Gang of Four
+---
+
+## Amaç
+
+Bir sınıfın yalnızca bir örneğine sahip olduğundan emin olun ve ona global bir erişim noktası sağlayın.
+
+
+## Açıklama
+
+Örnek
+
+> Büyücülerin büyülerini çalıstıkları tek bir fildişi kule olabilir. Aynı büyülü fildişi kule,
+> büyücüler tarafından her zaman kullanılır. Buradaki fildişi kulesi singleton tasarım desenine örnektir.
+Özetle
+
+> Belirli bir sınıftan yalnızca bir nesnenin oluşturulmasını sağlar.
+Wikipedia açıklaması
+
+
+
+> Yazılım mühendisliğinde, tekil desen, bir sınıfın somutlaştırılmasını tek bir nesneyle sınırlayan
+> bir yazılım tasarım modelidir.Bu,sistemdeki eylemleri koordine etmek için
+> tam olarak bir nesne gerektiğinde kullanışlıdır.
+**Örnek**
+
+Joshua Bloch, Effective Java 2nd Edition p.18
+
+> Enum singleton tasarım desenini uygulamak için en iyi yoldur.
+```java
+public enum EnumIvoryTower {
+  INSTANCE
+}
+```
+
+Tanımladıktan sonra kullanmak için:
+
+```java
+var enumIvoryTower1 = EnumIvoryTower.INSTANCE;
+var enumIvoryTower2 = EnumIvoryTower.INSTANCE;
+assertEquals(enumIvoryTower1, enumIvoryTower2); // true
+```
+
+## Sınıf diagramı
+
+![alt text](https://github.com/iluwatar/java-design-patterns/blob/master/singleton/etc/singleton.urm.png)
+
+## Uygulanabilirlik
+
+Singleton tasarım deseni şu durumlarda kullanılmalıdır
+
+* Bir sınıfın tam olarak bir örneği olmalı ve iyi bilinen bir erişim noktasından istemciler tarafından erişilebilir olmalıdır.
+* Tek örnek alt sınıflandırma yoluyla genişletilebilir olduğunda ve istemciler, kodlarını değiştirmeden genişletilmiş bir örnek kullanabilmelidir
+
+## Use Case
+
+* Logging sınıflarında
+* Database bağlantılarını yönetmek için
+* File manager
+
+## Gerçek dünya örnekleri
+
+* [java.lang.Runtime#getRuntime()](http://docs.oracle.com/javase/8/docs/api/java/lang/Runtime.html#getRuntime%28%29)
+* [java.awt.Desktop#getDesktop()](http://docs.oracle.com/javase/8/docs/api/java/awt/Desktop.html#getDesktop--)
+* [java.lang.System#getSecurityManager()](http://docs.oracle.com/javase/8/docs/api/java/lang/System.html#getSecurityManager--)
+
+
+## Sonuçlar
+
+* Kendi yaratımını ve yaşam döngüsünü kontrol ederek Tek Sorumluluk İlkesini (SRP) ihlal ediyor.
+* Bu nesne tarafından kullanılan bir nesnenin ve kaynakların serbest bırakılmasını önleyen global bir paylaşılan örnek kullanmayı teşvik eder.
+* Birbirine sıkı bağlı kod oluşturur. Singleton tasarım deseni kullanan istemci sınıflarını test etmek zorlaşır.
+* Bir Singleton tasarım deseninden alt sınıflar oluşturmak neredeyse imkansız hale gelir.
+
+## Credits
+
+* [Design Patterns: Elements of Reusable Object-Oriented Software](https://www.amazon.com/gp/product/0201633612/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=0201633612&linkCode=as2&tag=javadesignpat-20&linkId=675d49790ce11db99d90bde47f1aeb59)
+* [Effective Java](https://www.amazon.com/gp/product/0134685997/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=0134685997&linkCode=as2&tag=javadesignpat-20&linkId=4e349f4b3ff8c50123f8147c828e53eb)
+* [Head First Design Patterns: A Brain-Friendly Guide](https://www.amazon.com/gp/product/0596007124/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=0596007124&linkCode=as2&tag=javadesignpat-20&linkId=6b8b6eea86021af6c8e3cd3fc382cb5b)
+* [Refactoring to Patterns](https://www.amazon.com/gp/product/0321213351/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=0321213351&linkCode=as2&tag=javadesignpat-20&linkId=2a76fcb387234bc71b1c61150b3cc3a7)
--- a/trampoline/src/main/java/com/iluwatar/trampoline/Trampoline.java
+++ b/trampoline/src/main/java/com/iluwatar/trampoline/Trampoline.java
@ -98,7 +98,7 @@ public interface Trampoline<T> {
        return trampoline(this);
      }

-      private T trampoline(final Trampoline<T> trampoline) {
+      T trampoline(final Trampoline<T> trampoline) {
        return Stream.iterate(trampoline, Trampoline::jump)
            .filter(Trampoline::complete)
            .findFirst()
--- a/typeobjectpattern/src/main/java/com/iluwatar/typeobject/CellPool.java
+++ b/typeobjectpattern/src/main/java/com/iluwatar/typeobject/CellPool.java
@ -26,9 +26,9 @@ package com.iluwatar.typeobject;
 import com.iluwatar.typeobject.Candy.Type;

 import java.io.IOException;
+import java.security.SecureRandom;
 import java.util.ArrayList;
 import java.util.List;
-import java.util.Random;
 import org.json.simple.parser.ParseException;

 /**
@ -38,7 +38,7 @@ import org.json.simple.parser.ParseException;
 */

 public class CellPool {
-  private static final Random RANDOM = new Random();
+  private static final SecureRandom RANDOM = new SecureRandom();
  public static final String FRUIT = "fruit";
  public static final String CANDY = "candy";
  List<Cell> pool;
--- a/unit-of-work/pom.xml
+++ b/unit-of-work/pom.xml
@ -35,19 +35,9 @@

    <artifactId>unit-of-work</artifactId>
    <dependencies>
-        <dependency>
-            <groupId>junit</groupId>
-            <artifactId>junit</artifactId>
-        </dependency>
-        <dependency>
-            <groupId>org.junit.vintage</groupId>
-            <artifactId>junit-vintage-engine</artifactId>
-            <scope>test</scope>
-        </dependency>
        <dependency>
            <groupId>org.junit.jupiter</groupId>
            <artifactId>junit-jupiter-engine</artifactId>
-            <version>5.0.0</version>
            <scope>test</scope>
        </dependency>
        <dependency>
--- a/unit-of-work/src/test/java/com/iluwatar/unitofwork/AppTest.java
+++ b/unit-of-work/src/test/java/com/iluwatar/unitofwork/AppTest.java
@ -23,17 +23,17 @@

 package com.iluwatar.unitofwork;

-import org.junit.Test;
-
 import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;

+import org.junit.jupiter.api.Test;
+
 /**
 * AppTest
 */
-public class AppTest {
+class AppTest {

  @Test
-  public void shouldExecuteWithoutException() {
+  void shouldExecuteWithoutException() {
    assertDoesNotThrow(() -> App.main(new String[]{}));
  }
 }
--- a/unit-of-work/src/test/java/com/iluwatar/unitofwork/StudentRepositoryTest.java
+++ b/unit-of-work/src/test/java/com/iluwatar/unitofwork/StudentRepositoryTest.java
@ -23,43 +23,32 @@

 package com.iluwatar.unitofwork;

-import static org.junit.Assert.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.never;
 import static org.mockito.Mockito.times;
 import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.verifyNoMoreInteractions;
-import static org.mockito.Mockito.verifyZeroInteractions;

 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
-import org.junit.Before;
-import org.junit.Test;
-import org.junit.runner.RunWith;
-import org.mockito.Mock;
-import org.mockito.runners.MockitoJUnitRunner;
+import org.junit.jupiter.api.Test;

 /**
 * tests {@link StudentRepository}
 */
-@RunWith(MockitoJUnitRunner.class)
-public class StudentRepositoryTest {
+
+class StudentRepositoryTest {
  private final Student student1 = new Student(1, "Ram", "street 9, cupertino");
  private final Student student2 = new Student(1, "Sham", "Z bridge, pune");

-  private Map<String, List<Student>> context;
-  @Mock
-  private StudentDatabase studentDatabase;
-  private StudentRepository studentRepository;
-
-  @Before
-  public void setUp() {
-    context = new HashMap<>();
-    studentRepository = new StudentRepository(context, studentDatabase);
-  }
+  private final Map<String, List<Student>> context = new HashMap<>();
+  private final StudentDatabase studentDatabase = mock(StudentDatabase.class);
+  private final StudentRepository studentRepository = new StudentRepository(context, studentDatabase);;

  @Test
-  public void shouldSaveNewStudentWithoutWritingToDb() {
+  void shouldSaveNewStudentWithoutWritingToDb() {
    studentRepository.registerNew(student1);
    studentRepository.registerNew(student2);

@ -68,7 +57,7 @@ public class StudentRepositoryTest {
  }

  @Test
-  public void shouldSaveDeletedStudentWithoutWritingToDb() {
+  void shouldSaveDeletedStudentWithoutWritingToDb() {
    studentRepository.registerDeleted(student1);
    studentRepository.registerDeleted(student2);

@ -77,7 +66,7 @@ public class StudentRepositoryTest {
  }

  @Test
-  public void shouldSaveModifiedStudentWithoutWritingToDb() {
+  void shouldSaveModifiedStudentWithoutWritingToDb() {
    studentRepository.registerModified(student1);
    studentRepository.registerModified(student2);

@ -86,7 +75,7 @@ public class StudentRepositoryTest {
  }

  @Test
-  public void shouldSaveAllLocalChangesToDb() {
+  void shouldSaveAllLocalChangesToDb() {
    context.put(UnitActions.INSERT.getActionValue(), List.of(student1));
    context.put(UnitActions.MODIFY.getActionValue(), List.of(student1));
    context.put(UnitActions.DELETE.getActionValue(), List.of(student1));
@ -99,7 +88,7 @@ public class StudentRepositoryTest {
  }

  @Test
-  public void shouldNotWriteToDbIfContextIsNull() {
+  void shouldNotWriteToDbIfContextIsNull() {
    var studentRepository = new StudentRepository(null, studentDatabase);

    studentRepository.commit();
@ -108,16 +97,16 @@ public class StudentRepositoryTest {
  }

  @Test
-  public void shouldNotWriteToDbIfNothingToCommit() {
+  void shouldNotWriteToDbIfNothingToCommit() {
    var studentRepository = new StudentRepository(new HashMap<>(), studentDatabase);

    studentRepository.commit();

-    verifyZeroInteractions(studentDatabase);
+    verifyNoMoreInteractions(studentDatabase);
  }

  @Test
-  public void shouldNotInsertToDbIfNoRegisteredStudentsToBeCommitted() {
+  void shouldNotInsertToDbIfNoRegisteredStudentsToBeCommitted() {
    context.put(UnitActions.MODIFY.getActionValue(), List.of(student1));
    context.put(UnitActions.DELETE.getActionValue(), List.of(student1));

@ -127,7 +116,7 @@ public class StudentRepositoryTest {
  }

  @Test
-  public void shouldNotModifyToDbIfNotRegisteredStudentsToBeCommitted() {
+  void shouldNotModifyToDbIfNotRegisteredStudentsToBeCommitted() {
    context.put(UnitActions.INSERT.getActionValue(), List.of(student1));
    context.put(UnitActions.DELETE.getActionValue(), List.of(student1));

@ -137,7 +126,7 @@ public class StudentRepositoryTest {
  }

  @Test
-  public void shouldNotDeleteFromDbIfNotRegisteredStudentsToBeCommitted() {
+  void shouldNotDeleteFromDbIfNotRegisteredStudentsToBeCommitted() {
    context.put(UnitActions.INSERT.getActionValue(), List.of(student1));
    context.put(UnitActions.MODIFY.getActionValue(), List.of(student1));

@ -145,4 +134,4 @@ public class StudentRepositoryTest {

    verify(studentDatabase, never()).delete(student1);
  }
-}
+}
--- a/update-method/pom.xml
+++ b/update-method/pom.xml
@ -35,10 +35,6 @@

    <artifactId>update-method</artifactId>
    <dependencies>
-        <dependency>
-            <groupId>junit</groupId>
-            <artifactId>junit</artifactId>
-        </dependency>
        <dependency>
            <groupId>org.junit.jupiter</groupId>
            <artifactId>junit-jupiter-engine</artifactId>
--- a/update-method/src/main/java/com/iluwatar/updatemethod/World.java
+++ b/update-method/src/main/java/com/iluwatar/updatemethod/World.java
@ -23,9 +23,9 @@

 package com.iluwatar.updatemethod;

+import java.security.SecureRandom;
 import java.util.ArrayList;
 import java.util.List;
-import java.util.Random;

 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@ -66,7 +66,7 @@ public class World {
   */
  private void processInput() {
    try {
-      int lag = new Random().nextInt(200) + 50;
+      int lag = new SecureRandom().nextInt(200) + 50;
      Thread.sleep(lag);
    } catch (InterruptedException e) {
      LOGGER.error(e.getMessage());
--- a/update-method/src/test/java/com/iluwatar/updatemethod/AppTest.java
+++ b/update-method/src/test/java/com/iluwatar/updatemethod/AppTest.java
@ -23,14 +23,14 @@

 package com.iluwatar.updatemethod;

-import org.junit.Test;
+import org.junit.jupiter.api.Test;

 import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;

-public class AppTest {
+class AppTest {

  @Test
-  public void shouldExecuteApplicationWithoutException() {
+  void shouldExecuteApplicationWithoutException() {
    assertDoesNotThrow(() -> App.main(new String[]{}));
  }
 }
--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
Subhrodip Mohanta	b423002e6c	updated Random() to SecureRandom() (#1670 ) * updated Random() to SecureRandom() * batch 2 of SecureRandom updates	2021-03-06 13:26:02 +02:00
CF	c150871a94	Update to JUnit5 across all modules (#1668 ) * Updated saga to JUnit 5 * Update fix for CI job in trampoline module * Updated update-method module to JUnit 5 * Upgraded to latest JUnit Jupiter JUnit 4 is not needed when using JUnit-Vintage * Reverted change to access modifier on Trampoline * Cleanup to resolve code smells * Formatting * Formatting * Migrating to JUnit5 and updating some Mockito patterns * Migrating to JUnit5 * Migrating to JUnit5 * Migrating to JUnit 5 * Formatting cleanup * Added missing scope for junit * Fixed tests that were not running previously. Co-authored-by: Subhrodip Mohanta <hello@subho.xyz>	2021-03-06 14:42:46 +05:30
Subhrodip Mohanta	e9d0b3e98c	remove labeling trigger for PR and actions set to master (#1666 )	2021-03-05 19:51:09 +02:00
CF	903453229c	Updated update-method module to JUnit 5 (#1542 ) * Updated saga to JUnit 5 * Update fix for CI job in trampoline module * Updated update-method module to JUnit 5 * Upgraded to latest JUnit Jupiter JUnit 4 is not needed when using JUnit-Vintage * Reverted change to access modifier on Trampoline * Cleanup to resolve code smells * Formatting * Formatting Co-authored-by: Subhrodip Mohanta <hello@subho.xyz>	2021-03-04 10:49:31 +05:30
Subhrodip Mohanta	c3c90e2bd4	created CircleCI config for sonar analysis (#1664 ) * created sonar config #1663 * updated license headers * xvfb to run tests * updated circle image to enable css and JS analysis	2021-03-01 16:50:34 +02:00
Halil Demir	268e4148b4	#1625 add Turkish translation for singleton design pattern (#1665 ) Co-authored-by: Halil Demir <halil.demir@zalando.de> Co-authored-by: Subhrodip Mohanta <hello@subho.xyz>	2021-03-01 19:20:06 +05:30
allcontributors[bot]	0220f3df12	docs: add richardmr36 as a contributor (#1662 ) * docs: update README.md [skip ci] * docs: update .all-contributorsrc [skip ci] Co-authored-by: allcontributors[bot] <46447321+allcontributors[bot]@users.noreply.github.com>	2021-02-28 11:51:47 +02:00
Martel Richard	846d05672a	#1638 Add Parameter Object pattern (#1650 ) * #1638 Add Parameter Object pattern * #1638 Fix comments and formatting for Parameter Object pattern * #1638 Fix formatting, commenting, remove string concatenation in Parameter Object pattern * #1638 Fix readme formatting and log parameter object	2021-02-28 11:42:48 +02:00
Subhrodip Mohanta	03bc4a6b9a	update CI badge (#1658 )	2021-02-21 15:21:11 +02:00
Ilkka Seppälä	cda2675221	Upgrade jacoco (#1657 ) Co-authored-by: Subhrodip Mohanta <hello@subho.xyz>	2021-02-16 12:27:11 +05:30
Subhrodip Mohanta	a79bed9a46	#1655 : added maven wrapper (#1656 ) Addresses Point 1 and 2	2021-02-15 17:13:06 +02:00
Ilkka Seppälä	7c01bc7464	format readme.md	2021-02-14 23:43:33 +02:00
Ilkka Seppälä	edbea7d50b	format readme.md	2021-02-14 23:33:40 +02:00
Ilkka Seppälä	d2f926e3e8	format readme.md	2021-02-14 23:23:05 +02:00
Ilkka Seppälä	fc837e289f	format readme.md	2021-02-14 23:01:05 +02:00
Ilkka Seppälä	fce8d25736	format readme.md	2021-02-14 22:51:42 +02:00
Ilkka Seppälä	cbffcb28c8	#455 Static content hosting cloud pattern (#1654 ) * #455 work on readme.md * #455 work on readme.md * #455 S3 web site complete * #455 add cloudfront and diagram * Apply suggestions from code review added syntax highlighting Co-authored-by: Subhrodip Mohanta <hello@subho.xyz>	2021-02-15 01:42:21 +05:30