Entity With Entity Listener : Entity Listener « EJB3 « Java

1. Java
2. EJB3
3. Entity Listener

Entity With Entity Listener

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: EntityListener.java


import javax.persistence.PostLoad;
import javax.persistence.PostPersist;
import javax.persistence.PostRemove;
import javax.persistence.PostUpdate;

public class EntityListener
{
   @PostUpdate
   public void update(Object entity)
   {
      System.out.println("@PostUpdate: " + entity.getClass().getName());
   }

   @PostPersist
   public void persist(Object entity)
   {
      System.out.println("@PostPersist: " + entity.getClass().getName());
   }

   @PostLoad
   public void load(Object entity)
   {
      System.out.println("@PostLoad: " + entity.getClass().getName());
   }
      
   @PostRemove
   public void remove(Object entity)
   {
      System.out.println("@PostRemove: " + entity.getClass().getName());
   }
  
}


File: Employee.java

import javax.persistence.Entity;
import javax.persistence.EntityListeners;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.PostRemove;

@Entity
@EntityListeners(EntityListener.class)
public class Employee implements java.io.Serializable {
  private int id;

  private String firstName;

  private String lastName;

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


  @PostRemove
  public void postRemove()
  {
     System.out.println("@PostRemove");
  }

  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: 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: 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




           
       

EJB-EntityWithEntityListener.zip( 4,489 k)

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