Source Code : Ejb With Generic Method

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Ejb With Generic Method

File: Employee.java


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

@Entity

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: EmployeeBean.java



import javax.annotation.Resource;
import javax.ejb.Stateful;
import javax.ejb.TransactionManagement;
import javax.ejb.TransactionManagementType;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.PersistenceContextType;
import javax.transaction.UserTransaction;

@Stateful
@TransactionManagement(TransactionManagementType.BEAN)
public class EmployeeBean implements EmployeeServiceLocal, EmployeeServiceRemote {
  @PersistenceContext(unitName = "EmployeeService", type = PersistenceContextType.EXTENDED)
  private EntityManager em;

  @Resource
  private UserTransaction ut;
  
  public EmployeeBean() {
  }


  public void doAction() {
    Employee emp = new Employee();
    emp.setFirstName("first");
    em.persist(emp);

  }
  public <T> T mergeEntity(T entity) {
    return em.merge(entity);
  }

  public <T> T persistEntity(T entity) {
    em.persist(entity);
    return entity;
  }

  public <T> T refreshEntity(T entity) {
    em.refresh(entity);
    return entity;
  }

  public void removeEntity(Object entity) {
    em.remove(em.merge(entity));
  }
  public void beginTrans()
    throws Exception {
    ut.begin();
  }

  public void commitTrans()
    throws Exception {
    ut.commit();
  }

  public void rollbackTrans()
    throws Exception {
    ut.rollback();
  }
}


File: EmployeeServiceLocal.java



import javax.ejb.Local;

@Local
public interface EmployeeServiceLocal {
  public void doAction();

  <T> T mergeEntity(T entity);

  <T> T persistEntity(T entity);

  <T> T refreshEntity(T entity);

  void removeEntity(Object entity);

  void beginTrans() throws Exception;

  void commitTrans() throws Exception;

  void rollbackTrans() throws Exception;
}


File: EmployeeServiceRemote.java

import javax.ejb.Remote;


@Remote
public interface EmployeeServiceRemote {
  public void doAction();

  <T> T mergeEntity(T entity);

  <T> T persistEntity(T entity);

  <T> T refreshEntity(T entity);

  void removeEntity(Object entity);

  void beginTrans() throws Exception;

  void commitTrans() throws Exception;

  void rollbackTrans() throws Exception;

}


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 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("EmployeeBean/remote");

    service.beginTrans();
    service.doAction();
    service.commitTrans();
  }

}




           
       

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