JAVA-12045 : move java concurrency ebook content code to common module (#12559)

* JAVA-12045 : move java concurrency ebook content code to common module

* JAVA-12045: addressed the review comments .. renamed package names and placed core-java-concurrency-simple module in pom.xml

* JAVA-12045: removed duplicate module after renaming java-simple-module to core-java-simple-module

core-java-modules/core-java-concurrency-advanced-2/README.md

@@ -11,7 +11,6 @@ This module contains articles about advanced topics about multithreading with co
 - [Java CyclicBarrier vs CountDownLatch](https://www.baeldung.com/java-cyclicbarrier-countdownlatch)
 - [Guide to the Fork/Join Framework in Java](https://www.baeldung.com/java-fork-join)
 - [Guide to ThreadLocalRandom in Java](https://www.baeldung.com/java-thread-local-random)
-- [The Thread.join() Method in Java](https://www.baeldung.com/java-thread-join)
 - [Passing Parameters to Java Threads](https://www.baeldung.com/java-thread-parameters)
 
 [[<-- previous]](/core-java-modules/core-java-concurrency-advanced)[[next -->]](/core-java-modules/core-java-concurrency-advanced-3)

core-java-modules/core-java-concurrency-advanced/README.md

@@ -12,5 +12,4 @@ This module contains articles about advanced topics about multithreading with co
 - [Guide to the Java Phaser](https://www.baeldung.com/java-phaser)
 - [An Introduction to Atomic Variables in Java](https://www.baeldung.com/java-atomic-variables)
 - [CyclicBarrier in Java](https://www.baeldung.com/java-cyclic-barrier)
-- [Guide to the Volatile Keyword in Java](https://www.baeldung.com/java-volatile)
 - More Articles: [[next -->]](/core-java-modules/core-java-concurrency-advanced-2)

core-java-modules/core-java-concurrency-basic-2/README.md

@@ -5,10 +5,7 @@ This module contains articles about basic Java concurrency
 ### Relevant Articles: 
 
 - [How to Delay Code Execution in Java](https://www.baeldung.com/java-delay-code-execution)
-- [wait and notify() Methods in Java](https://www.baeldung.com/java-wait-notify)
 - [Difference Between Wait and Sleep in Java](https://www.baeldung.com/java-wait-and-sleep)
-- [Guide to the Synchronized Keyword in Java](https://www.baeldung.com/java-synchronized)
-- [Life Cycle of a Thread in Java](https://www.baeldung.com/java-thread-lifecycle)
 - [Guide to AtomicMarkableReference](https://www.baeldung.com/java-atomicmarkablereference)
 - [Why are Local Variables Thread-Safe in Java](https://www.baeldung.com/java-local-variables-thread-safe)
 - [How to Stop Execution After a Certain Time in Java](https://www.baeldung.com/java-stop-execution-after-certain-time)

core-java-modules/core-java-concurrency-basic/README.md

@@ -3,8 +3,6 @@
 This module contains articles about basic Java concurrency
 
 ### Relevant Articles: 
-- [Guide To CompletableFuture](https://www.baeldung.com/java-completablefuture)
-- [A Guide to the Java ExecutorService](https://www.baeldung.com/java-executor-service-tutorial)
 - [Guide to java.util.concurrent.Future](https://www.baeldung.com/java-future)
 - [Overview of the java.util.concurrent](https://www.baeldung.com/java-util-concurrent)
 - [Implementing a Runnable vs Extending a Thread](https://www.baeldung.com/java-runnable-vs-extending-thread)
@@ -12,5 +10,4 @@ This module contains articles about basic Java concurrency
 - [ExecutorService – Waiting for Threads to Finish](https://www.baeldung.com/java-executor-wait-for-threads)
 - [Runnable vs. Callable in Java](https://www.baeldung.com/java-runnable-callable)
 - [What is Thread-Safety and How to Achieve it?](https://www.baeldung.com/java-thread-safety)
-- [How to Start a Thread in Java](https://www.baeldung.com/java-start-thread)
 - [[Next -->]](/core-java-modules/core-java-concurrency-basic-2)

core-java-modules/core-java-concurrency-simple/README.md

@@ -0,0 +1,18 @@
+### Mockito Articles that are also part of the e-book
+
+This module contains articles about Java Concurrency that are also part of an Ebook.
+
+## Relevant articles:
+
+- [Life Cycle of a Thread in Java](https://www.baeldung.com/java-thread-lifecycle)
+- [How to Start a Thread in Java](https://www.baeldung.com/java-start-thread)
+- [Thread's wait and notify() Methods in Java](https://www.baeldung.com/java-wait-notify)
+- [The Thread.join() Method in Java](https://www.baeldung.com/java-thread-join)
+- [Guide to the Synchronized Keyword in Java](https://www.baeldung.com/java-synchronized)
+- [Guide to the Volatile Keyword in Java](https://www.baeldung.com/java-volatile)
+- [A Guide to the Java ExecutorService](https://www.baeldung.com/java-executor-service-tutorial)
+- [Guide To CompletableFuture](https://www.baeldung.com/java-completablefuture)
+
+### NOTE:
+
+Since this is a module tied to an e-book, it should **not** be moved or used to store the code for any further article.

core-java-modules/core-java-concurrency-simple/pom.xml

@@ -0,0 +1,26 @@
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <artifactId>java-concurrency-simple</artifactId>
+    <version>0.1.0-SNAPSHOT</version>
+    <name>java-concurrency-simple</name>
+    <packaging>jar</packaging>
+
+    <parent>
+        <groupId>com.baeldung.core-java-modules</groupId>
+        <artifactId>core-java-modules</artifactId>
+        <version>0.0.1-SNAPSHOT</version>
+    </parent>
+
+    <build>
+        <finalName>java-concurrency-simple</finalName>
+        <resources>
+            <resource>
+                <directory>src/main/resources</directory>
+                <filtering>true</filtering>
+            </resource>
+        </resources>
+    </build>
+
+</project>

core-java-modules/pom.xml

@@ -42,6 +42,7 @@
         <module>core-java-collections-maps-2</module>
         <module>core-java-collections-maps-3</module>
         <module>core-java-collections-maps-5</module>
+		<module>core-java-concurrency-simple</module>
         <module>core-java-concurrency-2</module>
         <module>core-java-concurrency-advanced</module>
         <module>core-java-concurrency-advanced-2</module>