adding examples for Collection mapping

mapping/collection-mapping/.gitignore

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+/.metadata/

mapping/collection-mapping/ExampleApp/.classpath

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+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="src" output="target/classes" path="src/main/java">
+		<attributes>
+			<attribute name="optional" value="true"/>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry excluding="**" kind="src" output="target/classes" path="src/main/resources">
+		<attributes>
+			<attribute name="maven.pomderived" value="true"/>
+			<attribute name="optional" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="src" output="target/test-classes" path="src/test/java">
+		<attributes>
+			<attribute name="optional" value="true"/>
+			<attribute name="maven.pomderived" value="true"/>
+			<attribute name="test" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry excluding="**" kind="src" output="target/test-classes" path="src/test/resources">
+		<attributes>
+			<attribute name="maven.pomderived" value="true"/>
+			<attribute name="test" value="true"/>
+			<attribute name="optional" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8">
+		<attributes>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="con" path="org.eclipse.m2e.MAVEN2_CLASSPATH_CONTAINER">
+		<attributes>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="output" path="target/classes"/>
+</classpath>

mapping/collection-mapping/ExampleApp/.gitignore

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+/target/

mapping/collection-mapping/ExampleApp/.project

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+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>ExampleApp</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>org.eclipse.m2e.core.maven2Builder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+		<nature>org.eclipse.m2e.core.maven2Nature</nature>
+	</natures>
+</projectDescription>

mapping/collection-mapping/ExampleApp/.settings/org.eclipse.core.resources.prefs

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+eclipse.preferences.version=1
+encoding//src/main/java=UTF-8
+encoding//src/test/java=UTF-8
+encoding/<project>=UTF-8

mapping/collection-mapping/ExampleApp/.settings/org.eclipse.jdt.core.prefs

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+eclipse.preferences.version=1
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.8
+org.eclipse.jdt.core.compiler.compliance=1.8
+org.eclipse.jdt.core.compiler.problem.enablePreviewFeatures=disabled
+org.eclipse.jdt.core.compiler.problem.forbiddenReference=warning
+org.eclipse.jdt.core.compiler.problem.reportPreviewFeatures=ignore
+org.eclipse.jdt.core.compiler.release=disabled
+org.eclipse.jdt.core.compiler.source=1.8

mapping/collection-mapping/ExampleApp/.settings/org.eclipse.m2e.core.prefs

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+activeProfiles=
+eclipse.preferences.version=1
+resolveWorkspaceProjects=true
+version=1

mapping/collection-mapping/ExampleApp/pom.xml

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+<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>
+
+  <groupId>com.giriharan</groupId>
+  <artifactId>ExampleApp</artifactId>
+  <version>0.0.1-SNAPSHOT</version>
+  <packaging>jar</packaging>
+
+  <name>ExampleApp</name>
+  <url>http://maven.apache.org</url>
+
+  <properties>
+    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+  </properties>
+
+  <dependencies>
+    <dependency>
+      <groupId>junit</groupId>
+      <artifactId>junit</artifactId>
+      <version>3.8.1</version>
+      <scope>test</scope>
+    </dependency>
+            <!-- https://mvnrepository.com/artifact/org.hibernate/hibernate-core -->
+<dependency>
+    <groupId>org.hibernate</groupId>
+    <artifactId>hibernate-core</artifactId>
+    <version>5.6.15.Final</version>
+</dependency>
+<!-- https://mvnrepository.com/artifact/com.mysql/mysql-connector-j -->
+<dependency>
+    <groupId>com.mysql</groupId>
+    <artifactId>mysql-connector-j</artifactId>
+    <version>8.1.0</version>
+</dependency>
+
+  </dependencies>
+</project>

mapping/collection-mapping/ExampleApp/src/main/java/com/giriharan/ExampleApp/App.java

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+package com.giriharan.ExampleApp;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.hibernate.Session;
+import org.hibernate.SessionFactory;
+import org.hibernate.Transaction;
+import org.hibernate.cfg.Configuration;
+
+public class App 
+{
+    public static void main( String[] args )
+    {
+    	Configuration cfg = new Configuration().configure("hibernate.cfg.xml").addAnnotatedClass(Student.class);
+    	SessionFactory sf = cfg.buildSessionFactory();
+
+    	Session session = sf.openSession();
+    	Transaction transaction = session.beginTransaction();
+
+    	List<String> classmates = new ArrayList<>();
+    	classmates.add("Takemichi");
+    	classmates.add("Draken");
+
+    	Student student = new Student("Mikey",classmates);
+
+    	session.save(student);   
+
+    	transaction.commit();
+    	session.close();
+
+    	System.out.println("Successfully added!");
+    }
+}

mapping/collection-mapping/ExampleApp/src/main/java/com/giriharan/ExampleApp/Student.java

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+package com.giriharan.ExampleApp;
+
+import java.util.List;
+
+import javax.persistence.CollectionTable;
+import javax.persistence.Column;
+import javax.persistence.ElementCollection;
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
+import javax.persistence.Id;
+import javax.persistence.JoinColumn;
+import javax.persistence.OrderColumn;
+
+@Entity
+public class Student {
+	@Id
+	@GeneratedValue(strategy = GenerationType.AUTO)
+	private int id;
+
+	@Column(name="name")
+	private String name;
+
+	@ElementCollection
+	@CollectionTable(name="classmates_table",joinColumns = @JoinColumn(name="sid"))
+	@Column(name="classmates")
+	@OrderColumn(name="pos")
+	private List<String> classmates;
+
+
+
+	public Student(String name, List<String> classmates) {
+		this.name = name;
+		this.classmates = classmates;
+	}
+
+	public String getName() {
+		return name;
+	}
+
+	public void setName(String name) {
+		this.name = name;
+	}
+
+	public List<String> getClassmates() {
+		return classmates;
+	}
+
+	public void setClassmates(List<String> classmates) {
+		this.classmates = classmates;
+	}
+}

mapping/collection-mapping/ExampleApp/src/main/java/hibernate.cfg.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE hibernate-configuration PUBLIC
+		"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
+		"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
+<hibernate-configuration>
+    <session-factory>
+        <property name="hibernate.connection.password">Password@123</property>
+        <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/mapping?createDatabaseIfNotExist=true</property>
+        <property name="hibernate.connection.username">admin</property>
+        <property name="hibernate.show_sql">true</property>
+    	<property name="hbm2ddl.auto">update</property>
+    </session-factory>
+</hibernate-configuration>

mapping/collection-mapping/ExampleApp/src/test/java/com/giriharan/ExampleApp/AppTest.java

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+package com.giriharan.ExampleApp;
+
+import junit.framework.Test;
+import junit.framework.TestCase;
+import junit.framework.TestSuite;
+
+/**
+ * Unit test for simple App.
+ */
+public class AppTest 
+    extends TestCase
+{
+    /**
+     * Create the test case
+     *
+     * @param testName name of the test case
+     */
+    public AppTest( String testName )
+    {
+        super( testName );
+    }
+
+    /**
+     * @return the suite of tests being tested
+     */
+    public static Test suite()
+    {
+        return new TestSuite( AppTest.class );
+    }
+
+    /**
+     * Rigourous Test :-)
+     */
+    public void testApp()
+    {
+        assertTrue( true );
+    }
+}