Entity bean lifecycle: PostLoad : Entity Lifecycle « EJB3 « Java

1. Java
2. EJB3
3. Entity Lifecycle

Entity bean lifecycle: PostLoad

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);
    

    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: Employee.java

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.PostLoad;

@Entity
public class Employee implements java.io.Serializable {
  private int id;

  private String firstName;

  private String lastName;

  @Id
  @GeneratedValue
  public int getId() {
    return id;
  }

  @PostLoad
  public void postLoad()
  {
     System.out.println("@PostLoad");
  }
  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: 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>





           
       

EJB-UsePostLoad.zip( 4,487 k)

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6.	Entity bean lifecycle: PrePersist