Entity bean lifecycle: PreRemove : Entity Lifecycle « EJB3





File: Employee.java



import javax.persistence.Entity;

import javax.persistence.GeneratedValue;

import javax.persistence.Id;

import javax.persistence.PreRemove;



@Entity

public class Employee implements java.io.Serializable {

  private int id;



  private String firstName;



  private String lastName;



  @Id

  @GeneratedValue

  public int getId() {

    return id;

  }



  @PreRemove

  public void preRemove()

  {

     System.out.println("@PreRemove");

  }



  public void setId(int id) {

    this.id = id;

  }



  public String getFirstName() {

    return firstName;

  }



  public void setFirstName(String first) {

    this.firstName = first;

  }



  public String getLastName() {

    return lastName;

  }



  public void setLastName(String last) {

    this.lastName = last;

  }

}





File: EmployeeService.java





import java.util.List;



import javax.ejb.Stateless;

import javax.persistence.EntityManager;

import javax.persistence.PersistenceContext;



@Stateless

public class EmployeeService implements EmployeeServiceLocal, EmployeeServiceRemote {

  @PersistenceContext(unitName="EmployeeService")

  EntityManager em;

  

  public EmployeeService() {

  }

  public void doAction(){





    Employee employee = new Employee();

    employee.setFirstName("E");

    employee.setLastName("E");



    em.persist(employee);



    employee.setLastName("New");

    em.merge(employee);

    

    em.remove(employee);

    

    em.flush();

    System.out.println("saved");

    

    

    List list = em.createQuery("FROM Employee p").getResultList();

    

    

  }

}



    





File: EmployeeServiceLocal.java







import java.util.Collection;



import javax.ejb.Local;



@Local

public interface EmployeeServiceLocal {

    public void doAction();



}







File: EmployeeServiceRemote.java









import java.util.Collection;



import javax.ejb.Remote;



@Remote

public interface EmployeeServiceRemote{

  public void doAction();  



}







File: jndi.properties



java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory

java.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfaces

java.naming.provider.url=localhost:1099





File: Main.java



import java.util.Collection;



import javax.naming.InitialContext;





public class Main {



  public static void main(String[] a) throws Exception {



    EmployeeServiceRemote service = null;



    // Context compEnv = (Context) new InitialContext().lookup("java:comp/env");



    // service = (HelloService)new InitialContext().lookup("java:comp/env/ejb/HelloService");

    service = (EmployeeServiceRemote) new InitialContext().lookup("EmployeeService/remote");

    

    



    

    

    service.doAction();



  }



}







File: persistence.xml



<persistence 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" version="1.0">

  <persistence-unit name="EmployeeService" > <!-- transaction-type="JTA" -->

        <jta-data-source>java:/DefaultDS</jta-data-source>

        <properties>

         <property name="hibernate.hbm2ddl.auto" value="create-drop"/>

        </properties>

<!--

    <properties>

      <property name="hibernate.dialect" value="org.hibernate.dialect.HSQLDialect"/>

      <property name="hibernate.hbm2ddl.auto" value="update"/>

      <property name="hibernate.connection.driver_class" value="org.hsqldb.jdbcDriver"/>

      <property name="hibernate.connection.username" value="sa"/>

      <property name="hibernate.connection.password" value=""/>

      <property name="hibernate.connection.url" value="jdbc:hsqldb:data/tutorial"/>

    </properties>

-->    

  </persistence-unit>

</persistence>





File: ejb-jar.xml



<?xml version="1.0" encoding="UTF-8"?>



<ejb-jar>

   <enterprise-beans>

   </enterprise-beans>

</ejb-jar>
Entity bean lifecycle: PreRemove : Entity Lifecycle « EJB3 « Java
