Can not run JPA sample example using J2SE

[Abhay Agarwal]

Hi

I am reading "Pro JPA2" book by Mike.
I am trying to execute JPA example (given in Chapter 2) using J2SE . I am using MYSQL DB.
here is the code

import javax.persistence.Entity;
import javax.persistence.Id;

@Entity
public class Employee {
       @Id 
	private String id;
	private int salary;
	private String name;
	
	public String getId() {
		return id;
	}
	public void setId(String id) {
		this.id = id;
	}

	public int getSalary() {
		return salary;
	}
	public void setSalary(int salary) {
		this.salary = salary;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
 }

import javax.persistence.EntityManager;
public class EmployeeBankService {
	protected EntityManager em;
	public EmployeeBankService(EntityManager emgr) {
		this.em = emgr;
	}
	public Employee createEmployee(String id, String name, int salary) {
		Employee e = new Employee();
		e.setId(id);
		e.setName(name);
		e.setSalary(salary);
		em.persist(e);
		return e;
	}
} 

import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
public class EmployeeTest {
	public static void main(String[] arg) {
		EntityManagerFactory emf = Persistence.createEntityManagerFactory("EmployeeService");
		EntityManager emgr = emf.createEntityManager();
		emgr.getTransaction().begin();
		Employee emp = new EmployeeBankService(emgr).createEmployee("1", "Jon", 12345);
		emgr.getTransaction().commit();
		System.out.println("Employee from database = "  + emp);
	}
}

Persistence.xml file

<?xml version="1.0" encoding="UTF-8"?>
<persistence>
<persistence-unit name="EmployeeService" transaction-type="RESOURCE_LOCAL">
<class>com.bank.Employee</class>
<properties>
            <property name="java.persistence.jdbc.driver" value="com.mysql.jdbc.Driver"/>
            <property name="java.persistence.jdbc.user" value="root"/>
            <property name="java.persistence.jdbc.password" value="root"/>
            <property name="java.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/test"/>
            </properties>
   </persistence-unit>
</persistence>

I have created all these above mentioned files but now i am not able to run it using J2SE
Please let me know how can i package it and run it using J2SE?
What will be mandatory lib/jar files that i require to run this code successfully?

[Christophe Verré]

ItDoesntWorkIsUseless. What kind of error do you have ?

[Abhay Agarwal]

Hi

Putting my question in different way

I want to know the steps that i should follow to run a sample JPA code (as mentioned above in my post) in a J2SE eniv.
I have got all code ready but do not know how to run it for eg - what are the dependent lib/jars that i will require, what will be folder structure in which i should organize my above mentioned code etc ?

Thanks
Abhay

[Ulf Dittmer]

The folder structure is immaterial - choose whatever you like. The way you run your code is also immaterial - Ant, Maven, command line, from a script - whatever way you're comfortable with will work. There's nothing special about JPA in that regard.

The libraries you need are a) JPA, 2) the JDBC driver for your DB, and c) the libraries that make up whatever JPA implementation you're using (for example, OpenJPA, Hibernate or EclipseLink).