Initial jpa test

derby.log

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+----------------------------------------------------------------
+Thu Nov 15 13:30:22 EET 2018:
+Booting Derby version The Apache Software Foundation - Apache Derby - 10.8.2.2 - (1181258): instance a816c00e-0167-1722-e50d-000006f22160 
+on database directory /mnt/c/Users/Pascal Fares/Documents/NetBeansProjects/testJPAeclipselink/simpleDb  with class loader sun.misc.Launcher$AppClassLoader@7f31245a 
+Loaded from file:/mnt/c/Users/Pascal%20Fares/Documents/NetBeansProjects/testJPAeclipselink/target/alternateLocation/derby-10.8.2.2.jar
+java.vendor=Oracle Corporation
+java.runtime.version=1.8.0_181-8u181-b13-1ubuntu0.18.04.1-b13
+user.dir=/mnt/c/Users/Pascal Fares/Documents/NetBeansProjects/testJPAeclipselink
+derby.system.home=null
+Database Class Loader started - derby.database.classpath=''

ij.properties

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+ij.protocol=jdbc:derby:
+ij.database=simpleDb
+ij.maximumDisplayWidth=20

localrun.sh

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+mvn package
+cd target
+java -cp 'lib/*:testJPAeclipselink-1.0-SNAPSHOT.jar' lb.edu.isae.testjpaeclipselink.jpa.JpaTest

pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<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>lb.edu.isae</groupId>
+    <artifactId>testJPAeclipselink</artifactId>
+    <version>1.0-SNAPSHOT</version>
+    <repositories>
+        <repository>
+            <id>EclipseLink Repo</id>
+            <url>http://download.eclipse.org/rt/eclipselink/maven.repo</url>
+            <name>EclipseLink Repo</name>
+        </repository>
+    </repositories>
+    <dependencies>
+
+        <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
+        <dependency>
+            <groupId>mysql</groupId>
+            <artifactId>mysql-connector-java</artifactId>
+            <version>8.0.13</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.eclipse.persistence</groupId>
+            <artifactId>eclipselink</artifactId>
+            <version>2.2.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.eclipse.persistence</groupId>
+            <artifactId>javax.persistence</artifactId>
+            <version>2.0.3</version>
+        </dependency>  
+    </dependencies>
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-dependency-plugin</artifactId>
+                <version>3.1.1</version>
+                <executions>
+                    <execution>
+                        <id>copy-dependencies</id>
+                        <phase>package</phase>
+                        <goals>
+                            <goal>copy-dependencies</goal>
+                        </goals>
+                        <configuration>
+                            <outputDirectory>${project.build.directory}/lib</outputDirectory>
+                            <overWriteReleases>false</overWriteReleases>
+                            <overWriteSnapshots>false</overWriteSnapshots>
+                            <overWriteIfNewer>true</overWriteIfNewer>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-jar-plugin</artifactId>
+                <version>3.1.0</version>
+                <configuration>
+                    <archive>
+                        <manifest>
+                            <addClasspath>true</addClasspath>
+                            <classpathPrefix>lib/</classpathPrefix>
+                            <mainClass>theMainClass</mainClass>
+                        </manifest>
+                    </archive>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+</project>

run.sh

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+mvn compile exec:java -Dexec.mainClass=lb.edu.isae.testjpaeclipselink.jpa.JpaTest

show-derby.sh

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+mvn dependency:copy-dependencies
+java -cp 'target/dependency/*' org.apache.derby.tools.ij -p ij.properties

src/main/java/lb/edu/isae/testjpaeclipselink/domain/Department.java

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+package lb.edu.isae.testjpaeclipselink.domain;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import javax.persistence.CascadeType;
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.Id;
+import javax.persistence.OneToMany;
+
+@Entity
+public class Department {
+
+	@Id
+	@GeneratedValue
+	private Long id;
+
+
+	private String name;
+
+	@OneToMany(mappedBy="department",cascade=CascadeType.PERSIST)
+	private List<Employee> employees = new ArrayList<Employee>();
+
+
+
+	public Department() {
+		super();
+	}
+	public Department(String name) {
+		this.name = name;
+	}
+	public Long getId() {
+		return id;
+	}
+	public void setId(Long id) {
+		this.id = id;
+	}
+	public String getName() {
+		return name;
+	}
+	public void setName(String name) {
+		this.name = name;
+	}
+	public List<Employee> getEmployees() {
+		return employees;
+	}
+	public void setEmployees(List<Employee> employees) {
+		this.employees = employees;
+	}
+}

src/main/java/lb/edu/isae/testjpaeclipselink/domain/Employee.java

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+package lb.edu.isae.testjpaeclipselink.domain;
+
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.Id;
+import javax.persistence.ManyToOne;
+
+@Entity
+public class Employee {
+	@Id
+	@GeneratedValue
+	private Long id;
+
+	private String name;
+
+	@ManyToOne
+	private Department department;
+
+	public Employee() {}
+
+	public Employee(String name, Department department) {
+		this.name = name;
+		this.department = department;
+	}
+
+
+	public Employee(String name) {
+		this.name = name;
+	}
+
+	public Long getId() {
+		return id;
+	}
+
+	public void setId(Long id) {
+		this.id = id;
+	}
+
+	public String getName() {
+		return name;
+	}
+
+	public void setName(String name) {
+		this.name = name;
+	}
+
+	public Department getDepartment() {
+		return department;
+	}
+
+	public void setDepartment(Department department) {
+		this.department = department;
+	}
+
+	@Override
+	public String toString() {
+		return "Employee [id=" + id + ", name=" + name + ", department="
+				+ department.getName() + "]";
+	}
+
+}

src/main/java/lb/edu/isae/testjpaeclipselink/jpa/JpaTest.java

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+package lb.edu.isae.testjpaeclipselink.jpa;
+
+import java.util.List;
+
+import javax.persistence.EntityManager;
+import javax.persistence.EntityManagerFactory;
+import javax.persistence.EntityTransaction;
+import javax.persistence.Persistence;
+
+import lb.edu.isae.testjpaeclipselink.domain.Employee;
+import lb.edu.isae.testjpaeclipselink.domain.Department;
+
+public class JpaTest {
+
+	private final EntityManager manager;
+
+	public JpaTest(EntityManager manager) {
+		this.manager = manager;
+	}
+	/**
+	 * @param args
+	 */
+	public static void main(String[] args) {
+		EntityManagerFactory factory = Persistence.createEntityManagerFactory("persistenceUnit");
+		EntityManager manager = factory.createEntityManager();
+		JpaTest test = new JpaTest(manager);
+
+		EntityTransaction tx = manager.getTransaction();
+		tx.begin();
+
+		test.createEmployees();
+
+		tx.commit();
+
+		test.listEmployees();
+
+		System.out.println(".. done");
+	}
+
+
+
+
+	private void createEmployees() {
+		int numOfEmployees = manager.createQuery("Select a From Employee a", Employee.class).getResultList().size();
+		if (numOfEmployees == 0) {
+			Department department = new Department("java cycle C");
+			manager.persist(department);
+
+			manager.persist(new Employee("Pascal E Fares",department));
+			manager.persist(new Employee("Etudiant Cnam",department));
+
+		}
+	}
+
+
+	private void listEmployees() {
+		List<Employee> resultList = manager.createQuery("Select a From Employee a", Employee.class).getResultList();
+		System.out.println("num of employess:" + resultList.size());
+		for (Employee next : resultList) {
+			System.out.println("next employee: " + next);
+		}
+	}
+
+
+}

src/main/resources/META-INF/persistence.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<persistence version="2.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">
+  <persistence-unit name="persistenceUnit" transaction-type="RESOURCE_LOCAL">
+    <!-- shouldn't be valid for java SE per specification, but it works for EclipseLink ... -->
+    <exclude-unlisted-classes>false</exclude-unlisted-classes>
+    <properties>
+      <property name="javax.persistence.jdbc.driver" value="com.mysql.cj.jdbc.Driver"/>
+      <property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/testDB"/>
+      <property name="javax.persistence.jdbc.user" value="pascalfares"/>
+      <property name="javax.persistence.jdbc.password" value="pascal00"/>
+      <!-- EclipseLink should create the database schema automatically -->
+      <property name="eclipselink.ddl-generation" value="drop-create-tables"/>
+      <property name="eclipselink.ddl-generation.output-mode" value="database"/>
+      <property name="eclipselink.logging.level" value="SEVERE"/>
+    </properties>
+  </persistence-unit>
+</persistence>