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JPA - Hello, World using Hibernate 5
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‎jpa/helloworld/hibernate/JPAWithHibernate5/.classpath‎

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

‎jpa/helloworld/hibernate/JPAWithHibernate5/.project‎

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<?xml version="1.0" encoding="UTF-8"?>
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<projectDescription>
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<name>JPAWithHibernate5</name>
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<comment></comment>
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<projects>
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</projects>
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<buildSpec>
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<buildCommand>
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<name>org.eclipse.jdt.core.javabuilder</name>
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<arguments>
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</arguments>
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</buildCommand>
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<buildCommand>
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<name>org.hibernate.eclipse.console.hibernateBuilder</name>
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<arguments>
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</arguments>
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</buildCommand>
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<buildCommand>
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<name>org.eclipse.m2e.core.maven2Builder</name>
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<arguments>
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</arguments>
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</buildCommand>
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<buildCommand>
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<name>org.jboss.tools.jst.web.kb.kbbuilder</name>
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<arguments>
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</arguments>
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</buildCommand>
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<buildCommand>
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<name>org.jboss.tools.cdi.core.cdibuilder</name>
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<arguments>
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</arguments>
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</buildCommand>
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<buildCommand>
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<name>org.eclipse.wst.validation.validationbuilder</name>
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<arguments>
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</arguments>
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</buildCommand>
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</buildSpec>
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<natures>
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<nature>org.eclipse.jdt.core.javanature</nature>
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<nature>org.eclipse.m2e.core.maven2Nature</nature>
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<nature>org.hibernate.eclipse.console.hibernateNature</nature>
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<nature>org.jboss.tools.jst.web.kb.kbnature</nature>
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<nature>org.jboss.tools.cdi.core.cdinature</nature>
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</natures>
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</projectDescription>

‎jpa/helloworld/hibernate/JPAWithHibernate5/.settings/org.eclipse.jdt.core.prefs‎

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eclipse.preferences.version=1
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org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.8
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org.eclipse.jdt.core.compiler.compliance=1.8
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org.eclipse.jdt.core.compiler.problem.forbiddenReference=warning
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org.eclipse.jdt.core.compiler.source=1.8

‎jpa/helloworld/hibernate/JPAWithHibernate5/.settings/org.eclipse.m2e.core.prefs‎

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

‎jpa/helloworld/hibernate/JPAWithHibernate5/.settings/org.hibernate.eclipse.console.prefs‎

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default.configuration=JPAWithHibernate5
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eclipse.preferences.version=1
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hibernate3.enabled=true

‎jpa/helloworld/hibernate/JPAWithHibernate5/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"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>com.javahelps</groupId>
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<artifactId>JPAWithHibernate5</artifactId>
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<version>0.0.1-SNAPSHOT</version>
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<dependencies>
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<!-- Logback to print the logs generated by Hibernate -->
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<dependency>
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<groupId>ch.qos.logback</groupId>
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<artifactId>logback-classic</artifactId>
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<version>1.1.7</version>
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</dependency>
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<!-- Core of Hibernate -->
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<dependency>
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<groupId>org.hibernate</groupId>
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<artifactId>hibernate-core</artifactId>
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<version>5.2.3.Final</version>
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</dependency>
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<!-- Entity manager which is required for JPA -->
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<dependency>
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<groupId>org.hibernate</groupId>
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<artifactId>hibernate-entitymanager</artifactId>
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<version>5.2.3.Final</version>
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</dependency>
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<!-- JDBC Connector for MySQL -->
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<dependency>
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<groupId>mysql</groupId>
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<artifactId>mysql-connector-java</artifactId>
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<version>6.0.4</version>
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</dependency>
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</dependencies>
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<build>
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<plugins>
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<!-- This plugin is used to set the Java version 1.8 -->
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-compiler-plugin</artifactId>
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<version>3.5.1</version>
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<configuration>
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<source>1.8</source>
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<target>1.8</target>
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</configuration>
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</plugin>
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</plugins>
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</build>
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</project>

‎jpa/helloworld/hibernate/JPAWithHibernate5/src/main/java/com/javahelps/jpa/Main.java‎

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package com.javahelps.jpa;
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import java.util.List;
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import javax.persistence.EntityManager;
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import javax.persistence.EntityManagerFactory;
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import javax.persistence.EntityTransaction;
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import javax.persistence.Persistence;
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public class Main {
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// Create an EntityManagerFactory when you start the application.
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private static final EntityManagerFactory ENTITY_MANAGER_FACTORY = Persistence
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.createEntityManagerFactory("JavaHelps");
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public static void main(String[] args) {
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// Create two Students
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create(1, "Alice", 22); // Alice will get an id 1
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create(2, "Bob", 20); // Bob will get an id 2
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create(3, "Charlie", 25); // Charlie will get an id 3
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// Update the age of Bob using the id
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upate(2, "Bob", 25);
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// Delete the Alice from database
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delete(1);
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// Print all the Students
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List<Student> students = readAll();
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if (students != null) {
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for (Student stu : students) {
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System.out.println(stu);
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}
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}
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// NEVER FORGET TO CLOSE THE ENTITY_MANAGER_FACTORY
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ENTITY_MANAGER_FACTORY.close();
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}
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/**
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* Create a new Student.
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*
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* @param name
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* @param age
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*/
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public static void create(int id, String name, int age) {
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// Create an EntityManager
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EntityManager manager = ENTITY_MANAGER_FACTORY.createEntityManager();
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EntityTransaction transaction = null;
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try {
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// Get a transaction
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transaction = manager.getTransaction();
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// Begin the transaction
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transaction.begin();
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// Create a new Student object
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Student stu = new Student();
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stu.setId(id);
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stu.setName(name);
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stu.setAge(age);
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// Save the student object
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manager.persist(stu);
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// Commit the transaction
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transaction.commit();
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} catch (Exception ex) {
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// If there are any exceptions, roll back the changes
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if (transaction != null) {
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transaction.rollback();
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}
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// Print the Exception
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ex.printStackTrace();
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} finally {
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// Close the EntityManager
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manager.close();
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}
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}
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/**
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* Read all the Students.
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*
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* @return a List of Students
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*/
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public static List<Student> readAll() {
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List<Student> students = null;
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// Create an EntityManager
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EntityManager manager = ENTITY_MANAGER_FACTORY.createEntityManager();
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EntityTransaction transaction = null;
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try {
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// Get a transaction
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transaction = manager.getTransaction();
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// Begin the transaction
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transaction.begin();
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// Get a List of Students
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students = manager.createQuery("SELECT s FROM Student s", Student.class).getResultList();
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// Commit the transaction
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transaction.commit();
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} catch (Exception ex) {
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// If there are any exceptions, roll back the changes
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if (transaction != null) {
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transaction.rollback();
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}
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// Print the Exception
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ex.printStackTrace();
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} finally {
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// Close the EntityManager
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manager.close();
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}
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return students;
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}
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/**
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* Delete the existing Student.
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*
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* @param id
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*/
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public static void delete(int id) {
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// Create an EntityManager
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EntityManager manager = ENTITY_MANAGER_FACTORY.createEntityManager();
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EntityTransaction transaction = null;
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try {
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// Get a transaction
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transaction = manager.getTransaction();
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// Begin the transaction
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transaction.begin();
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// Get the Student object
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Student stu = manager.find(Student.class, id);
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// Delete the student
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manager.remove(stu);
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// Commit the transaction
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transaction.commit();
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} catch (Exception ex) {
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// If there are any exceptions, roll back the changes
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if (transaction != null) {
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transaction.rollback();
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}
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// Print the Exception
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ex.printStackTrace();
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} finally {
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// Close the EntityManager
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manager.close();
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}
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}
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/**
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* Update the existing Student.
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*
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* @param id
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* @param name
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* @param age
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*/
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public static void upate(int id, String name, int age) {
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// Create an EntityManager
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EntityManager manager = ENTITY_MANAGER_FACTORY.createEntityManager();
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EntityTransaction transaction = null;
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try {
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// Get a transaction
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transaction = manager.getTransaction();
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// Begin the transaction
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transaction.begin();
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// Get the Student object
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Student stu = manager.find(Student.class, id);
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// Change the values
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stu.setName(name);
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stu.setAge(age);
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// Update the student
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manager.persist(stu);
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// Commit the transaction
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transaction.commit();
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} catch (Exception ex) {
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// If there are any exceptions, roll back the changes
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if (transaction != null) {
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transaction.rollback();
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}
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// Print the Exception
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ex.printStackTrace();
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} finally {
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// Close the EntityManager
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manager.close();
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}
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}
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}

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