Java Tutorial/EJB3/Entity Bean Listener

Entity Bean Listener PostLoad

File: EmployeeBean.java

   <source lang="java">

import java.util.List; import javax.ejb.Stateless; import javax.persistence.EntityManager; import javax.persistence.PersistenceContext; @Stateless public class EmployeeBean implements EmployeeServiceLocal, EmployeeServiceRemote {

 @PersistenceContext(unitName="EmployeeService") private EntityManager manager;
 public void doAction(){
   Customer cust = new Customer();
   cust.setLastName("Bond");
   cust.setSsn(1L);
   manager.persist(cust);
   
   System.out.println("Saved");
   
   cust = manager.find(Customer.class,1L);
   System.out.println(cust.getLastName());
   
   cust.setLastName("new name");
   
   manager.persist(cust);
   
   cust = manager.find(Customer.class,1L);
   System.out.println(cust.getLastName());
   
   manager.remove(cust);
 }

}</source>

Entity Bean Listener PostPersist

File: EmployeeBean.java

   <source lang="java">

import java.util.List; import javax.ejb.Stateless; import javax.persistence.EntityManager; import javax.persistence.PersistenceContext; @Stateless public class EmployeeBean implements EmployeeServiceLocal, EmployeeServiceRemote {

 @PersistenceContext(unitName="EmployeeService") private EntityManager manager;
 public void doAction(){
   Customer cust = new Customer();
   cust.setLastName("Bond");
   cust.setSsn(1L);
   manager.persist(cust);
   
   System.out.println("Saved");
   
   cust = manager.find(Customer.class,1L);
   System.out.println(cust.getLastName());
   
   cust.setLastName("new name");
   
   manager.persist(cust);
   
   cust = manager.find(Customer.class,1L);
   System.out.println(cust.getLastName());
   
   manager.remove(cust);
 }

}</source>

Entity Bean Listener PostRemove

File: EmployeeBean.java

   <source lang="java">

import java.util.List; import javax.ejb.Stateless; import javax.persistence.EntityManager; import javax.persistence.PersistenceContext; @Stateless public class EmployeeBean implements EmployeeServiceLocal, EmployeeServiceRemote {

 @PersistenceContext(unitName="EmployeeService") private EntityManager manager;
 public void doAction(){
   Customer cust = new Customer();
   cust.setLastName("Bond");
   cust.setSsn(1L);
   manager.persist(cust);
   
   System.out.println("Saved");
   
   cust = manager.find(Customer.class,1L);
   System.out.println(cust.getLastName());
   
   cust.setLastName("new name");
   
   manager.persist(cust);
   
   cust = manager.find(Customer.class,1L);
   System.out.println(cust.getLastName());
   
   manager.remove(cust);
 }

}</source>

Entity Bean Listener PostUpdate

File: EmployeeBean.java

   <source lang="java">

import java.util.List; import javax.ejb.Stateless; import javax.persistence.EntityManager; import javax.persistence.PersistenceContext; @Stateless public class EmployeeBean implements EmployeeServiceLocal, EmployeeServiceRemote {

 @PersistenceContext(unitName="EmployeeService") private EntityManager manager;
 public void doAction(){
   Customer cust = new Customer();
   cust.setLastName("Bond");
   cust.setSsn(1L);
   manager.persist(cust);
   
   System.out.println("Saved");
   
   cust = manager.find(Customer.class,1L);
   System.out.println(cust.getLastName());
   
   cust.setLastName("new name");
   
   manager.persist(cust);
   
   cust = manager.find(Customer.class,1L);
   System.out.println(cust.getLastName());
   
   manager.remove(cust);
 }

}</source>