BAEL-5633 - dockersing a simple java jar (#12454)

docker-modules/docker-java-jar/src/main/java/com/baeldung/HelloWorld.java

@@ -0,0 +1,8 @@
+package com.baeldung;
+
+public class HelloWorld {
+
+    public static void main(String[] args){
+        System.out.println("Welcome to our application");
+    }
+}