Java 11 migration: patterns (remaining b-c) (#1081)

* Moves business-delegate pattern  to java 11

* Moves bytecode pattern  to java 11

* Moves caching pattern  to java 11

* Moves callback pattern  to java 11

* Moves chain pattern  to java 11

* Moves circuit-breaker pattern  to java 11

* Moves collection-pipeline pattern  to java 11

* Moves command pattern  to java 11

* Moves commander pattern  to java 11

* Moves composite pattern  to java 11

* Corrects test cases

caching/src/test/java/com/iluwatar/caching/AppTest.java

@@ -32,8 +32,7 @@ import java.io.IOException;
  */
 public class AppTest {
   @Test
-  public void test() throws IOException {
-    String[] args = {};
-    App.main(args);
+  public void test() {
+    App.main(new String[]{});
   }
 }

caching/src/test/java/com/iluwatar/caching/CachingTest.java

@@ -27,22 +27,21 @@ import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 
 /**
- *
  * Application test
- *
  */
 public class CachingTest {
-  App app;
+  private App app;
 
   /**
    * Setup of application test includes: initializing DB connection and cache size/capacity.
    */
   @BeforeEach
   public void setUp() {
-    AppManager.initDb(false); // VirtualDB (instead of MongoDB) was used in running the JUnit tests
-                              // to avoid Maven compilation errors. Set flag to true to run the
-                              // tests with MongoDB (provided that MongoDB is installed and socket
-                              // connection is open).
+    // VirtualDB (instead of MongoDB) was used in running the JUnit tests
+    // to avoid Maven compilation errors. Set flag to true to run the
+    // tests with MongoDB (provided that MongoDB is installed and socket
+    // connection is open).
+    AppManager.initDb(false);
     AppManager.initCacheCapacity(3);
     app = new App();
   }