Merge branch 'master' into java9

Update SonarCloud badge

.travis.yml

@@ -17,7 +17,7 @@ install:
 - mvn install -DskipTests=true -Dmaven.javadoc.skip=true -B -V -e
 
 after_success:
-- mvn clean org.jacoco:jacoco-maven-plugin:prepare-agent package sonar:sonar -Dsonar.host.url=https://sonarqube.com -Dsonar.login=$SONAR_TOKEN
+- mvn clean org.jacoco:jacoco-maven-plugin:prepare-agent package sonar:sonar -Dsonar.host.url=https://sonarcloud.io -Dsonar.login=$SONAR_TOKEN
 - bash update-ghpages.sh
 
 # use latest java version available instead of travis default

README.md

@@ -7,7 +7,7 @@
 [![Build status](https://travis-ci.org/iluwatar/java-design-patterns.svg?branch=master)](https://travis-ci.org/iluwatar/java-design-patterns)
 [![License MIT](https://img.shields.io/badge/license-MIT-blue.svg)](https://raw.githubusercontent.com/iluwatar/java-design-patterns/master/LICENSE.md)
 [![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)
-[![Quality Gate](https://sonarqube.com/api/badges/gate?key=com.iluwatar%3Ajava-design-patterns)](https://sonarqube.com/dashboard/index/com.iluwatar%3Ajava-design-patterns)
+[![Quality Gate](https://sonarcloud.io/api/project_badges/measure?project=com.iluwatar%3Ajava-design-patterns&metric=alert_status)](https://sonarcloud.io/dashboard/index/com.iluwatar%3Ajava-design-patterns)
 [![CII Best Practices](https://bestpractices.coreinfrastructure.org/projects/1503/badge)](https://bestpractices.coreinfrastructure.org/projects/1503)
 
 # Introduction

abstract-document/README.md

@@ -12,8 +12,6 @@ tags:
 ## Intent
 Achieve flexibility of untyped languages and keep the type-safety 
 
-![alt text](./etc/abstract-document-base.png "Abstract Document Base")
-
 ![alt text](./etc/abstract-document.png "Abstract Document Traits and Domain")
 
 

abstract-document/etc/abstract-document-base.ucls

@@ -1,58 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<class-diagram version="1.1.9" icons="true" automaticImage="PNG" always-add-relationships="false" generalizations="true" 
-  realizations="true" associations="true" dependencies="false" nesting-relationships="true" router="FAN">  
-  <interface id="1" language="java" name="com.iluwatar.abstractdocument.Document" project="design-patterns" 
-    file="/design-patterns/src/com/iluwatar/abstractdocument/Document.java" binary="false" corner="BOTTOM_RIGHT">    
-    <position height="-1" width="-1" x="249" y="405"/>    
-    <display autosize="true" stereotype="true" package="true" initial-value="false" signature="true" 
-      sort-features="false" accessors="true" visibility="true">      
-      <attributes public="true" package="true" protected="true" private="true" static="true"/>      
-      <operations public="true" package="true" protected="true" private="true" static="true"/>    
-    </display>  
-  </interface>  
-  <class id="2" language="java" name="com.iluwatar.abstractdocument.AbstractDocument" project="design-patterns" 
-    file="/design-patterns/src/com/iluwatar/abstractdocument/AbstractDocument.java" binary="false" corner="BOTTOM_RIGHT">    
-    <position height="-1" width="-1" x="250" y="237"/>    
-    <display autosize="true" stereotype="true" package="true" initial-value="false" signature="true" 
-      sort-features="false" accessors="true" visibility="true">      
-      <attributes public="true" package="true" protected="true" private="true" static="true"/>      
-      <operations public="true" package="true" protected="true" private="true" static="true"/>    
-    </display>  
-  </class>  
-  <class id="3" language="java" name="com.iluwatar.abstractdocument.domain.Car" project="design-patterns" 
-    file="/design-patterns/src/com/iluwatar/abstractdocument/domain/Car.java" binary="false" corner="BOTTOM_RIGHT">    
-    <position height="-1" width="-1" x="108" y="75"/>    
-    <display autosize="true" stereotype="true" package="true" initial-value="false" signature="true" 
-      sort-features="false" accessors="true" visibility="true">      
-      <attributes public="true" package="true" protected="true" private="true" static="true"/>      
-      <operations public="true" package="true" protected="true" private="true" static="true"/>    
-    </display>  
-  </class>  
-  <class id="4" language="java" name="com.iluwatar.abstractdocument.domain.Part" project="design-patterns" 
-    file="/design-patterns/src/com/iluwatar/abstractdocument/domain/Part.java" binary="false" corner="BOTTOM_RIGHT">    
-    <position height="-1" width="-1" x="400" y="76"/>    
-    <display autosize="true" stereotype="true" package="true" initial-value="false" signature="true" 
-      sort-features="false" accessors="true" visibility="true">      
-      <attributes public="true" package="true" protected="true" private="true" static="true"/>      
-      <operations public="true" package="true" protected="true" private="true" static="true"/>    
-    </display>  
-  </class>  
-  <generalization id="5">    
-    <end type="SOURCE" refId="4"/>    
-    <end type="TARGET" refId="2"/>  
-  </generalization>  
-  <realization id="6">    
-    <end type="SOURCE" refId="2"/>    
-    <end type="TARGET" refId="1"/>  
-  </realization>  
-  <generalization id="7">    
-    <end type="SOURCE" refId="3"/>    
-    <end type="TARGET" refId="2"/>  
-  </generalization>  
-  <classifier-display autosize="true" stereotype="true" package="true" initial-value="false" signature="true" 
-    sort-features="false" accessors="true" visibility="true">    
-    <attributes public="true" package="true" protected="true" private="true" static="true"/>    
-    <operations public="true" package="true" protected="true" private="true" static="true"/>  
-  </classifier-display>  
-  <association-display labels="true" multiplicity="true"/>
-</class-diagram>

abstract-document/etc/abstract-document.ucls

@@ -1,91 +1,137 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<class-diagram version="1.1.9" icons="true" automaticImage="PNG" always-add-relationships="false" generalizations="true" 
+<class-diagram version="1.2.2" icons="true" always-add-relationships="false" generalizations="true" realizations="true" 
-  realizations="true" associations="true" dependencies="false" nesting-relationships="true" router="FAN">  
+  associations="true" dependencies="false" nesting-relationships="true" router="FAN">  
-  <interface id="1" language="java" name="com.iluwatar.abstractdocument.Document" project="design-patterns" 
+  <class id="1" language="java" name="com.iluwatar.abstractdocument.AbstractDocument" project="abstract-document" 
-    file="/design-patterns/src/com/iluwatar/abstractdocument/Document.java" binary="false" corner="BOTTOM_RIGHT">    
+    file="/abstract-document/src/main/java/com/iluwatar/abstractdocument/AbstractDocument.java" binary="false" 
-    <position height="-1" width="-1" x="341" y="376"/>    
+    corner="BOTTOM_RIGHT">    
-    <display autosize="true" stereotype="true" package="true" initial-value="false" signature="true" 
+    <position height="-1" width="-1" x="659" y="286"/>    
-      sort-features="false" accessors="true" visibility="true">      
-      <attributes public="true" package="true" protected="true" private="true" static="true"/>      
-      <operations public="true" package="true" protected="true" private="true" static="true"/>    
-    </display>  
-  </interface>  
-  <interface id="2" language="java" name="com.iluwatar.abstractdocument.domain.HasModel" project="design-patterns" 
-    file="/design-patterns/src/com/iluwatar/abstractdocument/domain/HasModel.java" binary="false" corner="BOTTOM_RIGHT">    
-    <position height="81" width="173" x="41" y="194"/>    
-    <display autosize="true" stereotype="true" package="true" initial-value="false" signature="true" 
-      sort-features="false" accessors="true" visibility="true">      
-      <attributes public="true" package="true" protected="true" private="true" static="true"/>      
-      <operations public="true" package="true" protected="true" private="true" static="true"/>    
-    </display>  
-  </interface>  
-  <interface id="3" language="java" name="com.iluwatar.abstractdocument.domain.HasPrice" project="design-patterns" 
-    file="/design-patterns/src/com/iluwatar/abstractdocument/domain/HasPrice.java" binary="false" corner="BOTTOM_RIGHT">    
-    <position height="81" width="175" x="254" y="194"/>    
-    <display autosize="true" stereotype="true" package="true" initial-value="false" signature="true" 
-      sort-features="false" accessors="true" visibility="true">      
-      <attributes public="true" package="true" protected="true" private="true" static="true"/>      
-      <operations public="true" package="true" protected="true" private="true" static="true"/>    
-    </display>  
-  </interface>  
-  <interface id="4" language="java" name="com.iluwatar.abstractdocument.domain.HasParts" project="design-patterns" 
-    file="/design-patterns/src/com/iluwatar/abstractdocument/domain/HasParts.java" binary="false" corner="BOTTOM_RIGHT">    
-    <position height="81" width="173" x="469" y="194"/>    
-    <display autosize="true" stereotype="true" package="true" initial-value="false" signature="true" 
-      sort-features="false" accessors="true" visibility="true">      
-      <attributes public="true" package="true" protected="true" private="true" static="true"/>      
-      <operations public="true" package="true" protected="true" private="true" static="true"/>    
-    </display>  
-  </interface>  
-  <class id="5" language="java" name="com.iluwatar.abstractdocument.domain.Car" project="design-patterns" 
-    file="/design-patterns/src/com/iluwatar/abstractdocument/domain/Car.java" binary="false" corner="BOTTOM_RIGHT">    
-    <position height="99" width="173" x="254" y="37"/>    
     <display autosize="true" stereotype="true" package="true" initial-value="false" signature="true" 
       sort-features="false" accessors="true" visibility="true">      
       <attributes public="true" package="true" protected="true" private="true" static="true"/>      
       <operations public="true" package="true" protected="true" private="true" static="true"/>    
     </display>  
   </class>  
-  <class id="6" language="java" name="com.iluwatar.abstractdocument.domain.Part" project="design-patterns" 
+  <interface id="2" language="java" name="com.iluwatar.abstractdocument.Document" project="abstract-document" 
-    file="/design-patterns/src/com/iluwatar/abstractdocument/domain/Part.java" binary="false" corner="BOTTOM_RIGHT">    
+    file="/abstract-document/src/main/java/com/iluwatar/abstractdocument/Document.java" binary="false" 
-    <position height="99" width="173" x="41" y="37"/>    
+    corner="BOTTOM_RIGHT">    
+    <position height="-1" width="-1" x="562" y="27"/>    
+    <display autosize="true" stereotype="true" package="true" initial-value="false" signature="true" 
+      sort-features="false" accessors="true" visibility="true">      
+      <attributes public="true" package="true" protected="true" private="true" static="true"/>      
+      <operations public="true" package="true" protected="true" private="true" static="true"/>    
+    </display>  
+  </interface>  
+  <class id="3" language="java" name="com.iluwatar.abstractdocument.domain.Car" project="abstract-document" 
+    file="/abstract-document/src/main/java/com/iluwatar/abstractdocument/domain/Car.java" binary="false" 
+    corner="BOTTOM_RIGHT">    
+    <position height="-1" width="-1" x="348" y="737"/>    
     <display autosize="true" stereotype="true" package="true" initial-value="false" signature="true" 
       sort-features="false" accessors="true" visibility="true">      
       <attributes public="true" package="true" protected="true" private="true" static="true"/>      
       <operations public="true" package="true" protected="true" private="true" static="true"/>    
     </display>  
   </class>  
-  <realization id="7">    
+  <class id="4" language="java" name="com.iluwatar.abstractdocument.domain.Part" project="abstract-document" 
-    <end type="SOURCE" refId="5"/>    
+    file="/abstract-document/src/main/java/com/iluwatar/abstractdocument/domain/Part.java" binary="false" 
-    <end type="TARGET" refId="2"/>  
+    corner="BOTTOM_RIGHT">    
+    <position height="-1" width="-1" x="760" y="746"/>    
+    <display autosize="true" stereotype="true" package="true" initial-value="false" signature="true" 
+      sort-features="false" accessors="true" visibility="true">      
+      <attributes public="true" package="true" protected="true" private="true" static="true"/>      
+      <operations public="true" package="true" protected="true" private="true" static="true"/>    
+    </display>  
+  </class>  
+  <interface id="5" language="java" name="com.iluwatar.abstractdocument.domain.HasModel" project="abstract-document" 
+    file="/abstract-document/src/main/java/com/iluwatar/abstractdocument/domain/HasModel.java" binary="false" 
+    corner="BOTTOM_RIGHT">    
+    <position height="-1" width="-1" x="355" y="297"/>    
+    <display autosize="true" stereotype="true" package="true" initial-value="false" signature="true" 
+      sort-features="false" accessors="true" visibility="true">      
+      <attributes public="true" package="true" protected="true" private="true" static="true"/>      
+      <operations public="true" package="true" protected="true" private="true" static="true"/>    
+    </display>  
+  </interface>  
+  <interface id="6" language="java" name="com.iluwatar.abstractdocument.domain.HasParts" project="abstract-document" 
+    file="/abstract-document/src/main/java/com/iluwatar/abstractdocument/domain/HasParts.java" binary="false" 
+    corner="BOTTOM_RIGHT">    
+    <position height="-1" width="-1" x="109" y="297"/>    
+    <display autosize="true" stereotype="true" package="true" initial-value="false" signature="true" 
+      sort-features="false" accessors="true" visibility="true">      
+      <attributes public="true" package="true" protected="true" private="true" static="true"/>      
+      <operations public="true" package="true" protected="true" private="true" static="true"/>    
+    </display>  
+  </interface>  
+  <interface id="7" language="java" name="com.iluwatar.abstractdocument.domain.HasPrice" project="abstract-document" 
+    file="/abstract-document/src/main/java/com/iluwatar/abstractdocument/domain/HasPrice.java" binary="false" 
+    corner="BOTTOM_RIGHT">    
+    <position height="-1" width="-1" x="1008" y="283"/>    
+    <display autosize="true" stereotype="true" package="true" initial-value="false" signature="true" 
+      sort-features="false" accessors="true" visibility="true">      
+      <attributes public="true" package="true" protected="true" private="true" static="true"/>      
+      <operations public="true" package="true" protected="true" private="true" static="true"/>    
+    </display>  
+  </interface>  
+  <interface id="8" language="java" name="com.iluwatar.abstractdocument.domain.HasType" project="abstract-document" 
+    file="/abstract-document/src/main/java/com/iluwatar/abstractdocument/domain/HasType.java" binary="false" 
+    corner="BOTTOM_RIGHT">    
+    <position height="-1" width="-1" x="1257" y="277"/>    
+    <display autosize="true" stereotype="true" package="true" initial-value="false" signature="true" 
+      sort-features="false" accessors="true" visibility="true">      
+      <attributes public="true" package="true" protected="true" private="true" static="true"/>      
+      <operations public="true" package="true" protected="true" private="true" static="true"/>    
+    </display>  
+  </interface>  
+  <realization id="9">    
+    <end type="SOURCE" refId="4"/>    
+    <end type="TARGET" refId="8"/>  
   </realization>  
-  <realization id="8">    
+  <realization id="10">    
+    <end type="SOURCE" refId="3"/>    
+    <end type="TARGET" refId="7"/>  
+  </realization>  
+  <generalization id="11">    
     <end type="SOURCE" refId="6"/>    
     <end type="TARGET" refId="2"/>  
-  </realization>  
-  <generalization id="9">    
-    <end type="SOURCE" refId="2"/>    
-    <end type="TARGET" refId="1"/>  
   </generalization>  
-  <realization id="10">    
+  <realization id="12">    
-    <end type="SOURCE" refId="5"/>    
+    <end type="SOURCE" refId="4"/>    
-    <end type="TARGET" refId="3"/>  
+    <end type="TARGET" refId="5"/>  
   </realization>  
-  <realization id="11">    
+  <realization id="13">    
-    <end type="SOURCE" refId="5"/>    
+    <end type="SOURCE" refId="4"/>    
-    <end type="TARGET" refId="4"/>  
+    <end type="TARGET" refId="7"/>  
   </realization>  
-  <generalization id="12">    
+  <generalization id="14">    
     <end type="SOURCE" refId="3"/>    
     <end type="TARGET" refId="1"/>  
   </generalization>  
-  <generalization id="13">    
+  <realization id="15">    
+    <end type="SOURCE" refId="3"/>    
+    <end type="TARGET" refId="6"/>  
+  </realization>  
+  <generalization id="16">    
+    <end type="SOURCE" refId="8"/>    
+    <end type="TARGET" refId="2"/>  
+  </generalization>  
+  <generalization id="17">    
+    <end type="SOURCE" refId="7"/>    
+    <end type="TARGET" refId="2"/>  
+  </generalization>  
+  <realization id="18">    
+    <end type="SOURCE" refId="3"/>    
+    <end type="TARGET" refId="5"/>  
+  </realization>  
+  <generalization id="19">    
     <end type="SOURCE" refId="4"/>    
     <end type="TARGET" refId="1"/>  
   </generalization>  
-  <realization id="14">    
+  <generalization id="20">    
-    <end type="SOURCE" refId="6"/>    
+    <end type="SOURCE" refId="5"/>    
-    <end type="TARGET" refId="3"/>  
+    <end type="TARGET" refId="2"/>  
+  </generalization>  
+  <realization id="21">    
+    <end type="SOURCE" refId="1"/>    
+    <end type="TARGET" refId="2"/>  
   </realization>  
   <classifier-display autosize="true" stereotype="true" package="true" initial-value="false" signature="true" 
     sort-features="false" accessors="true" visibility="true">    

abstract-document/pom.xml

@@ -29,7 +29,7 @@
     <parent>
         <artifactId>java-design-patterns</artifactId>
         <groupId>com.iluwatar</groupId>
-        <version>1.18.0</version>
+        <version>1.19.0-SNAPSHOT</version>
     </parent>
     <artifactId>abstract-document</artifactId>
     <dependencies>

abstract-factory/README.md

@@ -179,10 +179,15 @@ Use the Abstract Factory pattern when
 
 *	Dependency injection in java hides the service class dependencies that can lead to runtime errors that would have been caught at compile time.
 
+
+## Tutorial
+* [Abstract Factory Pattern Tutorial](https://www.journaldev.com/1418/abstract-factory-design-pattern-in-java) 
+
 ## Presentations
 
 * [Abstract Factory Pattern](etc/presentation.html) 
 
+
 ## Real world examples
 
 * [javax.xml.parsers.DocumentBuilderFactory](http://docs.oracle.com/javase/8/docs/api/javax/xml/parsers/DocumentBuilderFactory.html)

abstract-factory/pom.xml

@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.18.0</version>
+    <version>1.19.0-SNAPSHOT</version>
   </parent>
   <artifactId>abstract-factory</artifactId>
   <dependencies>

adapter/pom.xml

@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.18.0</version>
+    <version>1.19.0-SNAPSHOT</version>
   </parent>
   <artifactId>adapter</artifactId>
   <dependencies>

adapter/src/main/java/com/iluwatar/adapter/Captain.java

@@ -26,7 +26,7 @@ package com.iluwatar.adapter;
  * The Captain uses {@link RowingBoat} to sail. <br>
  * This is the client in the pattern.
  */
-public class Captain implements RowingBoat {
+public class Captain {
 
   private RowingBoat rowingBoat;
 
@@ -40,7 +40,6 @@ public class Captain implements RowingBoat {
     this.rowingBoat = rowingBoat;
   }
 
-  @Override
   public void row() {
     rowingBoat.row();
   }

adapter/src/test/java/com/iluwatar/adapter/AdapterPatternTest.java

@@ -66,7 +66,7 @@ public class AdapterPatternTest {
    */
   @Test
   public void testAdapter() {
-    RowingBoat captain = (RowingBoat) beans.get(ROWING_BEAN);
+    Captain captain = (Captain) beans.get(ROWING_BEAN);
 
     // when captain moves
     captain.row();

aggregator-microservices/aggregator-service/pom.xml

@@ -29,7 +29,7 @@
     <parent>
         <artifactId>aggregator-microservices</artifactId>
         <groupId>com.iluwatar</groupId>
-        <version>1.18.0</version>
+        <version>1.19.0-SNAPSHOT</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
 

aggregator-microservices/information-microservice/pom.xml

@@ -29,7 +29,7 @@
     <parent>
         <artifactId>aggregator-microservices</artifactId>
         <groupId>com.iluwatar</groupId>
-        <version>1.18.0</version>
+        <version>1.19.0-SNAPSHOT</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
 

aggregator-microservices/inventory-microservice/pom.xml

@@ -29,7 +29,7 @@
     <parent>
         <artifactId>aggregator-microservices</artifactId>
         <groupId>com.iluwatar</groupId>
-        <version>1.18.0</version>
+        <version>1.19.0-SNAPSHOT</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
 

aggregator-microservices/pom.xml

@@ -29,7 +29,7 @@
     <parent>
         <artifactId>java-design-patterns</artifactId>
         <groupId>com.iluwatar</groupId>
-        <version>1.18.0</version>
+        <version>1.19.0-SNAPSHOT</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
     <artifactId>aggregator-microservices</artifactId>

api-gateway/api-gateway-service/pom.xml

@@ -29,7 +29,7 @@
   <parent>
     <artifactId>api-gateway</artifactId>
     <groupId>com.iluwatar</groupId>
-    <version>1.18.0</version>
+    <version>1.19.0-SNAPSHOT</version>
   </parent>
   <modelVersion>4.0.0</modelVersion>
   <artifactId>api-gateway-service</artifactId>

api-gateway/image-microservice/pom.xml

@@ -29,7 +29,7 @@
   <parent>
     <artifactId>api-gateway</artifactId>
     <groupId>com.iluwatar</groupId>
-    <version>1.18.0</version>
+    <version>1.19.0-SNAPSHOT</version>
   </parent>
 
   <modelVersion>4.0.0</modelVersion>

api-gateway/pom.xml

@@ -29,7 +29,7 @@
   <parent>
     <artifactId>java-design-patterns</artifactId>
     <groupId>com.iluwatar</groupId>
-    <version>1.18.0</version>
+    <version>1.19.0-SNAPSHOT</version>
   </parent>
   <modelVersion>4.0.0</modelVersion>
   <artifactId>api-gateway</artifactId>

api-gateway/price-microservice/pom.xml

@@ -29,7 +29,7 @@
   <parent>
     <artifactId>api-gateway</artifactId>
     <groupId>com.iluwatar</groupId>
-    <version>1.18.0</version>
+    <version>1.19.0-SNAPSHOT</version>
   </parent>
 
   <modelVersion>4.0.0</modelVersion>

async-method-invocation/pom.xml

@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.18.0</version>
+    <version>1.19.0-SNAPSHOT</version>
   </parent>
   <artifactId>async-method-invocation</artifactId>
   <dependencies>

balking/pom.xml

@@ -29,7 +29,7 @@
   <parent>
     <artifactId>java-design-patterns</artifactId>
     <groupId>com.iluwatar</groupId>
-    <version>1.18.0</version>
+    <version>1.19.0-SNAPSHOT</version>
   </parent>
   <modelVersion>4.0.0</modelVersion>
 

bridge/README.md

@@ -188,6 +188,9 @@ Use the Bridge pattern when
 * you have a proliferation of classes. Such a class hierarchy indicates the need for splitting an object into two parts. Rumbaugh uses the term "nested generalizations" to refer to such class hierarchies
 * you want to share an implementation among multiple objects (perhaps using reference counting), and this fact should be hidden from the client. A simple example is Coplien's String class, in which multiple objects can share the same string representation.
 
+## Tutorial
+* [Bridge Pattern Tutorial](https://www.journaldev.com/1491/bridge-design-pattern-java)
+
 ## Credits
 
 * [Design Patterns: Elements of Reusable Object-Oriented Software](http://www.amazon.com/Design-Patterns-Elements-Reusable-Object-Oriented/dp/0201633612)

bridge/pom.xml

@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.18.0</version>
+    <version>1.19.0-SNAPSHOT</version>
   </parent>
   <artifactId>bridge</artifactId>
   <dependencies>

builder/pom.xml

@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.18.0</version>
+    <version>1.19.0-SNAPSHOT</version>
   </parent>
   <artifactId>builder</artifactId>
   <dependencies>

business-delegate/pom.xml

@@ -30,7 +30,7 @@
 	<parent>
 		<groupId>com.iluwatar</groupId>
 		<artifactId>java-design-patterns</artifactId>
-		<version>1.18.0</version>
+		<version>1.19.0-SNAPSHOT</version>
 	</parent>
 	<artifactId>business-delegate</artifactId>
 	<dependencies>

caching/pom.xml

@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.18.0</version>
+    <version>1.19.0-SNAPSHOT</version>
   </parent>
   <artifactId>caching</artifactId>
   <dependencies>

caching/src/main/java/com/iluwatar/caching/App.java

@@ -52,12 +52,12 @@ import org.slf4j.LoggerFactory;
  * whether the data is coming from the cache or the DB (i.e. separation of concern). The AppManager
  * ({@link AppManager}) handles the transaction of data to-and-from the underlying data store
  * (depending on the preferred caching policy/strategy).
- *
+ * <p>
- * <i>App --> AppManager --> CacheStore/LRUCache/CachingPolicy --> DBManager</i>
+ * <i>{@literal App --> AppManager --> CacheStore/LRUCache/CachingPolicy --> DBManager} </i>
  * </p>
  *
  * @see CacheStore
- * @See LRUCache
+ * @see LruCache
  * @see CachingPolicy
  *
  */

callback/pom.xml

@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.18.0</version>
+    <version>1.19.0-SNAPSHOT</version>
   </parent>
   <artifactId>callback</artifactId>
   <dependencies>

chain/pom.xml

@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.18.0</version>
+    <version>1.19.0-SNAPSHOT</version>
   </parent>
   <artifactId>chain</artifactId>
   <dependencies>

command/pom.xml

@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.18.0</version>
+    <version>1.19.0-SNAPSHOT</version>
   </parent>
   <artifactId>command</artifactId>
   <dependencies>

composite/pom.xml

@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.18.0</version>
+    <version>1.19.0-SNAPSHOT</version>
   </parent>
   <artifactId>composite</artifactId>
   <dependencies>

converter/pom.xml

@@ -29,7 +29,7 @@
     <parent>
         <artifactId>java-design-patterns</artifactId>
         <groupId>com.iluwatar</groupId>
-        <version>1.18.0</version>
+        <version>1.19.0-SNAPSHOT</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
     <dependencies>

cqrs/pom.xml

@@ -21,7 +21,7 @@
 	<parent>
 		<groupId>com.iluwatar</groupId>
 		<artifactId>java-design-patterns</artifactId>
-		<version>1.18.0</version>
+		<version>1.19.0-SNAPSHOT</version>
 	</parent>
 	<artifactId>cqrs</artifactId>
 	<dependencies>

cqrs/src/main/java/com/iluwatar/cqrs/domain/model/Author.java

@@ -50,14 +50,12 @@ public class Author {
    *          email of the author
    */
   public Author(String username, String name, String email) {
-    super();
     this.username = username;
     this.name = name;
     this.email = email;
   }
 
   protected Author() {
-    super();
   }
 
   public long getId() {

cqrs/src/main/java/com/iluwatar/cqrs/domain/model/Book.java

@@ -52,14 +52,12 @@ public class Book {
    *          author of the book
    */
   public Book(String title, double price, Author author) {
-    super();
     this.title = title;
     this.price = price;
     this.author = author;
   }
 
   protected Book() {
-    super();
   }
 
   public long getId() {

cqrs/src/main/java/com/iluwatar/cqrs/dto/Author.java

@@ -45,14 +45,12 @@ public class Author {
    *          username of the author
    */
   public Author(String name, String email, String username) {
-    super();
     this.name = name;
     this.email = email;
     this.username = username;
   }
 
   public Author() {
-    super();
   }
 
   public String getName() {

cqrs/src/main/java/com/iluwatar/cqrs/dto/Book.java

@@ -42,13 +42,11 @@ public class Book {
    *          price of the book
    */
   public Book(String title, double price) {
-    super();
     this.title = title;
     this.price = price;
   }
 
   public Book() {
-    super();
   }
 
   public String getTitle() {

dao/pom.xml

@@ -30,7 +30,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.18.0</version>
+    <version>1.19.0-SNAPSHOT</version>
   </parent>
   <artifactId>dao</artifactId>
 

dao/src/main/java/com/iluwatar/dao/InMemoryCustomerDao.java

@@ -31,7 +31,7 @@ import java.util.stream.Stream;
 /**
  * An in memory implementation of {@link CustomerDao}, which stores the customers in JVM memory
  * and data is lost when the application exits.
- * <br/>
+ * <br>
  * This implementation is useful as temporary database or for testing.
  */
 public class InMemoryCustomerDao implements CustomerDao {

dao/src/test/java/com/iluwatar/dao/DbCustomerDaoTest.java

@@ -185,7 +185,6 @@ public class DbCustomerDaoTest {
   public class ConnectivityIssue {
     
     private static final String EXCEPTION_CAUSE = "Connection not available";
-    //@Rule public ExpectedException exception = ExpectedException.none();
 
     /**
      * setup a connection failure scenario.
@@ -194,8 +193,6 @@ public class DbCustomerDaoTest {
     @BeforeEach
     public void setUp() throws SQLException {
       dao = new DbCustomerDao(mockedDatasource());
-      //exception.expect(Exception.class);
-     //exception.expectMessage(EXCEPTION_CAUSE);
     }
     
     private DataSource mockedDatasource() throws SQLException {

data-bus/pom.xml

@@ -33,7 +33,7 @@
     <parent>
         <groupId>com.iluwatar</groupId>
         <artifactId>java-design-patterns</artifactId>
-        <version>1.18.0</version>
+        <version>1.19.0-SNAPSHOT</version>
     </parent>
     <artifactId>data-bus</artifactId>
     <dependencies>

data-bus/src/main/java/com/iluwatar/databus/App.java

@@ -34,8 +34,7 @@ import java.time.LocalDateTime;
 /**
  * The Data Bus pattern
  * <p>
- * <p>{@see http://wiki.c2.com/?DataBusPattern}</p>
+ * @see <a href="http://wiki.c2.com/?DataBusPattern">http://wiki.c2.com/?DataBusPattern</a>
- * <p>
  * <p>The Data-Bus pattern provides a method where different parts of an application may
  * pass messages between each other without needing to be aware of the other's existence.</p>
  * <p>Similar to the {@code ObserverPattern}, members register themselves with the {@link DataBus}

data-mapper/pom.xml

@@ -28,7 +28,7 @@
 	<parent>
 		<groupId>com.iluwatar</groupId>
 		<artifactId>java-design-patterns</artifactId>
-		<version>1.18.0</version>
+		<version>1.19.0-SNAPSHOT</version>
 	</parent>
 	<artifactId>data-mapper</artifactId>
 	<dependencies>

data-mapper/src/main/java/com/iluwatar/datamapper/Student.java

@@ -41,8 +41,6 @@ public final class Student implements Serializable {
    * @param grade as respective grade of student
    */
   public Student(final int studentId, final String name, final char grade) {
-    super();
-
     this.studentId = studentId;
     this.name = name;
     this.grade = grade;

data-transfer-object/pom.xml

@@ -28,7 +28,7 @@
     <parent>
         <groupId>com.iluwatar</groupId>
         <artifactId>java-design-patterns</artifactId>
-        <version>1.18.0</version>
+        <version>1.19.0-SNAPSHOT</version>
     </parent>
     <artifactId>data-transfer-object</artifactId>
     <dependencies>

decorator/README.md

@@ -116,6 +116,9 @@ Use Decorator
 * For responsibilities that can be withdrawn
 * When extension by subclassing is impractical. Sometimes a large number of independent extensions are possible and would produce an explosion of subclasses to support every combination. Or a class definition may be hidden or otherwise unavailable for subclassing
 
+## Tutorial
+* [Decorator Pattern Tutorial](https://www.journaldev.com/1540/decorator-design-pattern-in-java-example)
+
 ## Real world examples
  * [java.io.InputStream](http://docs.oracle.com/javase/8/docs/api/java/io/InputStream.html), [java.io.OutputStream](http://docs.oracle.com/javase/8/docs/api/java/io/OutputStream.html),
  [java.io.Reader](http://docs.oracle.com/javase/8/docs/api/java/io/Reader.html) and [java.io.Writer](http://docs.oracle.com/javase/8/docs/api/java/io/Writer.html)

decorator/pom.xml

@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.18.0</version>
+    <version>1.19.0-SNAPSHOT</version>
   </parent>
   <artifactId>decorator</artifactId>
   <dependencies>

delegation/pom.xml

@@ -30,7 +30,7 @@
     <parent>
         <artifactId>java-design-patterns</artifactId>
         <groupId>com.iluwatar</groupId>
-        <version>1.18.0</version>
+        <version>1.19.0-SNAPSHOT</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
 

dependency-injection/pom.xml

@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.18.0</version>
+    <version>1.19.0-SNAPSHOT</version>
   </parent>
   <artifactId>dependency-injection</artifactId>
   <dependencies>

double-checked-locking/pom.xml

@@ -27,7 +27,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.18.0</version>
+    <version>1.19.0-SNAPSHOT</version>
   </parent>
   <artifactId>double-checked-locking</artifactId>
   <dependencies>

double-dispatch/pom.xml

@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.18.0</version>
+    <version>1.19.0-SNAPSHOT</version>
   </parent>
   <artifactId>double-dispatch</artifactId>
   <dependencies>

eip-aggregator/pom.xml

@@ -26,7 +26,7 @@
     <parent>
         <groupId>com.iluwatar</groupId>
         <artifactId>java-design-patterns</artifactId>
-        <version>1.18.0</version>
+        <version>1.19.0-SNAPSHOT</version>
     </parent>
 
     <dependencies>

eip-splitter/pom.xml

@@ -26,7 +26,7 @@
     <parent>
         <groupId>com.iluwatar</groupId>
         <artifactId>java-design-patterns</artifactId>
-        <version>1.18.0</version>
+        <version>1.19.0-SNAPSHOT</version>
     </parent>
 
     <dependencies>

eip-wire-tap/pom.xml

@@ -26,7 +26,7 @@
     <parent>
         <groupId>com.iluwatar</groupId>
         <artifactId>java-design-patterns</artifactId>
-        <version>1.18.0</version>
+        <version>1.19.0-SNAPSHOT</version>
     </parent>
 
     <dependencies>

event-aggregator/pom.xml

@@ -28,7 +28,7 @@
 	<parent>
 		<groupId>com.iluwatar</groupId>
 		<artifactId>java-design-patterns</artifactId>
-		<version>1.18.0</version>
+		<version>1.19.0-SNAPSHOT</version>
 	</parent>
 	<artifactId>event-aggregator</artifactId>
 	<dependencies>

event-aggregator/src/main/java/com/iluwatar/event/aggregator/KingsHand.java

@@ -30,7 +30,6 @@ package com.iluwatar.event.aggregator;
 public class KingsHand extends EventEmitter implements EventObserver {
 
   public KingsHand() {
-    super();
   }
 
   public KingsHand(EventObserver obs) {

event-aggregator/src/main/java/com/iluwatar/event/aggregator/LordBaelish.java

@@ -30,7 +30,6 @@ package com.iluwatar.event.aggregator;
 public class LordBaelish extends EventEmitter {
 
   public LordBaelish() {
-    super();
   }
 
   public LordBaelish(EventObserver obs) {

event-aggregator/src/main/java/com/iluwatar/event/aggregator/LordVarys.java

@@ -30,7 +30,6 @@ package com.iluwatar.event.aggregator;
 public class LordVarys extends EventEmitter {
 
   public LordVarys() {
-    super();
   }
 
   public LordVarys(EventObserver obs) {

event-aggregator/src/main/java/com/iluwatar/event/aggregator/Scout.java

@@ -30,7 +30,6 @@ package com.iluwatar.event.aggregator;
 public class Scout extends EventEmitter {
 
   public Scout() {
-    super();
   }
 
   public Scout(EventObserver obs) {

event-asynchronous/pom.xml

@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.18.0</version>
+    <version>1.19.0-SNAPSHOT</version>
   </parent>
   <artifactId>event-asynchronous</artifactId>
   <dependencies>

event-driven-architecture/pom.xml

@@ -31,7 +31,7 @@
     <parent>
         <groupId>com.iluwatar</groupId>
         <artifactId>java-design-patterns</artifactId>
-        <version>1.18.0</version>
+        <version>1.19.0-SNAPSHOT</version>
     </parent>
 
     <artifactId>event-driven-architecture</artifactId>

event-driven-architecture/src/main/java/com/iluwatar/eda/App.java

@@ -33,7 +33,7 @@ import com.iluwatar.eda.model.User;
 /**
  * An event-driven architecture (EDA) is a framework that orchestrates behavior around the
  * production, detection and consumption of events as well as the responses they evoke. An event is
- * any identifiable occurrence that has significance for system hardware or software. <p/> The
+ * any identifiable occurrence that has significance for system hardware or software. <p> The
  * example below uses an {@link EventDispatcher} to link/register {@link Event} objects to their
  * respective handlers once an {@link Event} is dispatched, it's respective handler is invoked and
  * the {@link Event} is handled accordingly.

event-queue/pom.xml

@@ -30,7 +30,7 @@
   <parent>
     <artifactId>java-design-patterns</artifactId>
     <groupId>com.iluwatar</groupId>
-    <version>1.18.0</version>
+    <version>1.19.0-SNAPSHOT</version>
   </parent>
   <artifactId>event-queue</artifactId>
   <dependencies>

event-queue/src/main/java/com/iluwatar/event/queue/Audio.java

@@ -59,7 +59,7 @@ public class Audio {
   }
   
   /**
-   * This method stops the Update Method's thread. 
+   * This method check the Update Method's thread is started.
    * @return boolean
    */
   public static synchronized boolean isServiceRunning() {

event-sourcing/pom.xml

@@ -30,7 +30,7 @@
   <parent>
     <artifactId>java-design-patterns</artifactId>
     <groupId>com.iluwatar</groupId>
-    <version>1.18.0</version>
+    <version>1.19.0-SNAPSHOT</version>
   </parent>
   <artifactId>event-sourcing</artifactId>
   <dependencies>

execute-around/pom.xml

@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.18.0</version>
+    <version>1.19.0-SNAPSHOT</version>
   </parent>
   <artifactId>execute-around</artifactId>
   <dependencies>

extension-objects/pom.xml

@@ -29,7 +29,7 @@
   <parent>
     <artifactId>java-design-patterns</artifactId>
     <groupId>com.iluwatar</groupId>
-    <version>1.18.0</version>
+    <version>1.19.0-SNAPSHOT</version>
   </parent>
   <modelVersion>4.0.0</modelVersion>
 

facade/pom.xml

@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.18.0</version>
+    <version>1.19.0-SNAPSHOT</version>
   </parent>
   <artifactId>facade</artifactId>
   <dependencies>

factory-kit/pom.xml

@@ -30,7 +30,7 @@
     <parent>
         <groupId>com.iluwatar</groupId>
         <artifactId>java-design-patterns</artifactId>
-        <version>1.18.0</version>
+        <version>1.19.0-SNAPSHOT</version>
     </parent>
     <artifactId>factory-kit</artifactId>
     <dependencies>

factory-kit/src/main/java/com/iluwatar/factorykit/App.java

@@ -45,7 +45,7 @@ public class App {
   /**
    * Program entry point.
    *
-   * @param args @param args command line args
+   * @param args command line args
    */
   public static void main(String[] args) {
     WeaponFactory factory = WeaponFactory.factory(builder -> {

factory-method/pom.xml

@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.18.0</version>
+    <version>1.19.0-SNAPSHOT</version>
   </parent>
   <artifactId>factory-method</artifactId>
   <dependencies>

feature-toggle/pom.xml

@@ -30,7 +30,7 @@
     <parent>
         <artifactId>java-design-patterns</artifactId>
         <groupId>com.iluwatar</groupId>
-        <version>1.18.0</version>
+        <version>1.19.0-SNAPSHOT</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
 

feature-toggle/src/main/java/com/iluwatar/featuretoggle/App.java

@@ -67,7 +67,7 @@ public class App {
    *  @see UserGroup
    *  @see Service
    *  @see PropertiesFeatureToggleVersion
-   *  @see com.iluwatar.featuretoggle.pattern.tieredversion.TieredFeatureToggleVersion;
+   *  @see com.iluwatar.featuretoggle.pattern.tieredversion.TieredFeatureToggleVersion
    */
   public static void main(String[] args) {
 

feature-toggle/src/main/java/com/iluwatar/featuretoggle/pattern/Service.java

@@ -47,7 +47,7 @@ public interface Service {
   /**
    * Returns if the welcome message to be displayed will be the enhanced version.
    *
-   * @return Boolean {@value true} if enhanced.
+   * @return Boolean {@code true} if enhanced.
    */
   boolean isEnhanced();
 

feature-toggle/src/main/java/com/iluwatar/featuretoggle/pattern/propertiesversion/PropertiesFeatureToggleVersion.java

@@ -91,7 +91,7 @@ public class PropertiesFeatureToggleVersion implements Service {
    * see the value of the boolean that was set in the constructor
    * {@link PropertiesFeatureToggleVersion#PropertiesFeatureToggleVersion(Properties)}
    *
-   * @return Boolean value {@value true} if enhanced.
+   * @return Boolean value {@code true} if enhanced.
    */
   @Override
   public boolean isEnhanced() {

feature-toggle/src/main/java/com/iluwatar/featuretoggle/pattern/tieredversion/TieredFeatureToggleVersion.java

@@ -65,7 +65,7 @@ public class TieredFeatureToggleVersion implements Service {
    * is driven by the user group. This method is a little redundant. However can be used to show that there is an
    * enhanced version available.
    *
-   * @return Boolean value {@value true} if enhanced.
+   * @return Boolean value {@code true} if enhanced.
    */
   @Override
   public boolean isEnhanced() {

fluentinterface/pom.xml

@@ -29,7 +29,7 @@
     <parent>
         <artifactId>java-design-patterns</artifactId>
         <groupId>com.iluwatar</groupId>
-        <version>1.18.0</version>
+        <version>1.19.0-SNAPSHOT</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
 

flux/pom.xml

@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.18.0</version>
+    <version>1.19.0-SNAPSHOT</version>
   </parent>
   <artifactId>flux</artifactId>
   <dependencies>

flyweight/pom.xml

@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.18.0</version>
+    <version>1.19.0-SNAPSHOT</version>
   </parent>
   <artifactId>flyweight</artifactId>
   <dependencies>

front-controller/pom.xml

@@ -30,7 +30,7 @@
 	<parent>
 		<groupId>com.iluwatar</groupId>
 		<artifactId>java-design-patterns</artifactId>
-		<version>1.18.0</version>
+		<version>1.19.0-SNAPSHOT</version>
 	</parent>
 	<artifactId>front-controller</artifactId>
 	<dependencies>

guarded-suspension/pom.xml

@@ -30,7 +30,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.18.0</version>
+    <version>1.19.0-SNAPSHOT</version>
   </parent>
   <packaging>jar</packaging>
   <artifactId>guarded-suspension</artifactId>

guarded-suspension/src/main/java/com/iluwatar/guarded/suspension/GuardedQueue.java

@@ -32,7 +32,7 @@ import java.util.Queue;
  * Guarded Queue is an implementation for Guarded Suspension Pattern
  * Guarded suspension pattern is used to handle a situation when you want to execute a method
  * on an object which is not in a proper state.
- * @see http://java-design-patterns.com/patterns/guarded-suspension/
+ * @see <a href="http://java-design-patterns.com/patterns/guarded-suspension/">http://java-design-patterns.com/patterns/guarded-suspension/</a>
  */
 public class GuardedQueue {
   private static final Logger LOGGER = LoggerFactory.getLogger(GuardedQueue.class);

half-sync-half-async/pom.xml

@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.18.0</version>
+    <version>1.19.0-SNAPSHOT</version>
   </parent>
   <artifactId>half-sync-half-async</artifactId>
   <dependencies>

half-sync-half-async/src/main/java/com/iluwatar/halfsynchalfasync/App.java

@@ -33,31 +33,31 @@ import java.util.concurrent.LinkedBlockingQueue;
  * {@link AsyncTask} and {@link AsynchronousService}.
  * 
  * <p>
- * <i>PROBLEM</i> <br/>
+ * <i>PROBLEM</i> <br>
  * A concurrent system have a mixture of short duration, mid duration and long duration tasks. Mid
  * or long duration tasks should be performed asynchronously to meet quality of service
  * requirements.
  * 
  * <p>
- * <i>INTENT</i> <br/>
+ * <i>INTENT</i> <br>
  * The intent of this pattern is to separate the the synchronous and asynchronous processing in the
  * concurrent application by introducing two intercommunicating layers - one for sync and one for
  * async. This simplifies the programming without unduly affecting the performance.
  * 
  * <p>
- * <i>APPLICABILITY</i> <br/>
+ * <i>APPLICABILITY</i> <br>
  * UNIX network subsystems - In operating systems network operations are carried out
- * asynchronously with help of hardware level interrupts.<br/>
+ * asynchronously with help of hardware level interrupts.<br>
  * CORBA - At the asynchronous layer one thread is associated with each socket that is connected
  * to the client. Thread blocks waiting for CORBA requests from the client. On receiving request it
  * is inserted in the queuing layer which is then picked up by synchronous layer which processes the
- * request and sends response back to the client.<br/>
+ * request and sends response back to the client.<br>
  * Android AsyncTask framework - Framework provides a way to execute long running blocking
  * calls, such as downloading a file, in background threads so that the UI thread remains free to
- * respond to user inputs.<br/>
+ * respond to user inputs.<br>
  * 
  * <p>
- * <i>IMPLEMENTATION</i> <br/>
+ * <i>IMPLEMENTATION</i> <br>
  * The main method creates an asynchronous service which does not block the main thread while the
  * task is being performed. The main thread continues its work which is similar to Async Method
  * Invocation pattern. The difference between them is that there is a queuing layer between

hexagonal/pom.xml

@@ -30,7 +30,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.18.0</version>
+    <version>1.19.0-SNAPSHOT</version>
   </parent>
   <artifactId>hexagonal</artifactId>
   <dependencies>

hexagonal/src/main/java/com/iluwatar/hexagonal/App.java

@@ -50,13 +50,13 @@ import com.iluwatar.hexagonal.sampledata.SampleData;
  * from the services it uses.<p>
  * 
  * The primary ports for the application are console interfaces
- * {@link ConsoleAdministration} through which the lottery round is
+ * {@link com.iluwatar.hexagonal.administration.ConsoleAdministration} through which the lottery round is
- * initiated and run and {@link ConsoleLottery} that allows players to
+ * initiated and run and {@link com.iluwatar.hexagonal.service.ConsoleLottery} that allows players to
  * submit lottery tickets for the draw.<p>
  * 
- * The secondary ports that application core uses are {@link WireTransfers}
+ * The secondary ports that application core uses are {@link com.iluwatar.hexagonal.banking.WireTransfers}
- * which is a banking service, {@link LotteryEventLog} that delivers
+ * which is a banking service, {@link com.iluwatar.hexagonal.eventlog.LotteryEventLog} that delivers
- * eventlog as lottery events occur and {@link LotteryTicketRepository}
+ * eventlog as lottery events occur and {@link com.iluwatar.hexagonal.database.LotteryTicketRepository}
  * that is the storage for the lottery tickets.
  *
  */

intercepting-filter/pom.xml

@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.18.0</version>
+    <version>1.19.0-SNAPSHOT</version>
   </parent>
   <artifactId>intercepting-filter</artifactId>
   <dependencies>

interpreter/pom.xml

@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.18.0</version>
+    <version>1.19.0-SNAPSHOT</version>
   </parent>
   <artifactId>interpreter</artifactId>
   <dependencies>

interpreter/src/test/java/com/iluwatar/interpreter/ExpressionTest.java

@@ -23,6 +23,7 @@
 package com.iluwatar.interpreter;
 
 import org.junit.jupiter.api.Disabled;
+import org.junit.jupiter.api.TestInstance;
 import org.junit.jupiter.params.ParameterizedTest;
 import org.junit.jupiter.params.provider.Arguments;
 import org.junit.jupiter.params.provider.MethodSource;
@@ -43,6 +44,7 @@ import static org.junit.jupiter.api.Assertions.assertNotNull;
  * @param <E> Type of Expression
  * @author Jeroen Meulemeester
  */
+@TestInstance(TestInstance.Lifecycle.PER_CLASS)
 public abstract class ExpressionTest<E extends Expression> {
 
   /**
@@ -88,6 +90,13 @@ public abstract class ExpressionTest<E extends Expression> {
     this.factory = factory;
   }
 
+  /**
+   * Create a new set of test entries with the expected result
+   *
+   * @return The list of parameters used during this test
+   */
+  public abstract Stream<Arguments> expressionProvider();
+
   /**
    * Verify if the expression calculates the correct result when calling {@link E#interpret()}
    */

interpreter/src/test/java/com/iluwatar/interpreter/MinusExpressionTest.java

@@ -38,7 +38,8 @@ public class MinusExpressionTest extends ExpressionTest<MinusExpression> {
    *
    * @return The list of parameters used during this test
    */
-  public static Stream<Arguments> expressionProvider() {
+  @Override
+  public Stream<Arguments> expressionProvider() {
     return prepareParameters((f, s) -> f - s);
   }
 

interpreter/src/test/java/com/iluwatar/interpreter/MultiplyExpressionTest.java

@@ -38,7 +38,8 @@ public class MultiplyExpressionTest extends ExpressionTest<MultiplyExpression> {
    *
    * @return The list of parameters used during this test
    */
-  public static Stream<Arguments> expressionProvider() {
+  @Override
+  public Stream<Arguments> expressionProvider() {
     return prepareParameters((f, s) -> f * s);
   }
 

interpreter/src/test/java/com/iluwatar/interpreter/NumberExpressionTest.java

@@ -42,7 +42,8 @@ public class NumberExpressionTest extends ExpressionTest<NumberExpression> {
    *
    * @return The list of parameters used during this test
    */
-  public static Stream<Arguments> expressionProvider() {
+  @Override
+  public Stream<Arguments> expressionProvider() {
     return prepareParameters((f, s) -> f);
   }
 

interpreter/src/test/java/com/iluwatar/interpreter/PlusExpressionTest.java

@@ -38,7 +38,8 @@ public class PlusExpressionTest extends ExpressionTest<PlusExpression> {
    *
    * @return The list of parameters used during this test
    */
-  public static Stream<Arguments> expressionProvider() {
+  @Override
+  public Stream<Arguments> expressionProvider() {
     return prepareParameters((f, s) -> f + s);
   }
 

iterator/pom.xml

@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.18.0</version>
+    <version>1.19.0-SNAPSHOT</version>
   </parent>
   <artifactId>iterator</artifactId>
   <dependencies>

layers/pom.xml

@@ -30,7 +30,7 @@
 	<parent>
 		<groupId>com.iluwatar</groupId>
 		<artifactId>java-design-patterns</artifactId>
-		<version>1.18.0</version>
+		<version>1.19.0-SNAPSHOT</version>
 	</parent>
 	<groupId>com.iluwatar.layers</groupId>
 	<artifactId>layers</artifactId>

lazy-loading/pom.xml

@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.18.0</version>
+    <version>1.19.0-SNAPSHOT</version>
   </parent>
   <artifactId>lazy-loading</artifactId>
   <dependencies>

marker/pom.xml

@@ -24,7 +24,7 @@
   <parent>
     <artifactId>java-design-patterns</artifactId>
     <groupId>com.iluwatar</groupId>
-    <version>1.18.0</version>
+    <version>1.19.0-SNAPSHOT</version>
   </parent>
   <modelVersion>4.0.0</modelVersion>
 

mediator/pom.xml

@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.18.0</version>
+    <version>1.19.0-SNAPSHOT</version>
   </parent>
   <artifactId>mediator</artifactId>
   <dependencies>