Entity With Embeddable Key : Entity Embeddable « EJB3 « Java

Entity With Embeddable Key

File: EmployeePK.java

import javax.persistence.Column;
import javax.persistence.Embeddable;

public class EmployeePK implements java.io.Serializable {
  private String lastName;

  private long ssn;

  public EmployeePK() {

  public EmployeePK(String lastName, long ssn) {
    this.lastName = lastName;
    this.ssn = ssn;
  public String getLastName() {
    return this.lastName;

  public void setLastName(String lastName) {
    this.lastName = lastName;
  public long getSsn() {
    return ssn;

  public void setSsn(long ssn) {
    this.ssn = ssn;

  public boolean equals(Object obj) {
    if (obj == this)
      return true;
    if (!(obj instanceof EmployeePK))
      return false;
    EmployeePK pk = (EmployeePK) obj;
    if (!lastName.equals(pk.lastName))
      return false;
    if (ssn != pk.ssn)
      return false;
    return true;

  public int hashCode() {
    return lastName.hashCode() + (int) ssn;

File: EmployeeService.java

import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;

public class EmployeeService implements EmployeeServiceLocal, EmployeeServiceRemote {
  EntityManager em;
  public EmployeeService() {
  public void doAction(){
    EmployeePK pk = new EmployeePK("B", 9999999);
    Employee cust = new Employee();


File: EmployeeServiceLocal.java

import java.util.Collection;

import javax.ejb.Local;

public interface EmployeeServiceLocal {
    public void doAction();


File: EmployeeServiceRemote.java

import java.util.Collection;

import javax.ejb.Remote;

public interface EmployeeServiceRemote{
  public void doAction();  


File: Employee.java

import java.io.Serializable;

import javax.persistence.AttributeOverride;
import javax.persistence.AttributeOverrides;
import javax.persistence.Column;
import javax.persistence.EmbeddedId;
import javax.persistence.Entity;
import javax.persistence.Table;
import javax.persistence.Transient;


public class Employee implements Serializable {
  private String firstName;
  private EmployeePK pk;

  public String getFirstName() { return firstName; }
  public void setFirstName(String firstName) { this.firstName = firstName; }

      @AttributeOverride(name="lastName", column=@Column(name="LAST_NAME")),
      @AttributeOverride(name="ssn", column=@Column(name="SSN"))
  public EmployeePK getPk() { return pk; }
  public void setPk(EmployeePK pk) { this.pk = pk; }

  public String getLastName() { return pk.getLastName(); }

  public long getSsn() { return pk.getSsn(); }

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");




File: jndi.properties



EJB-EntityWithEmbeddableKey.zip( 4,489 k)

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1.Entity With Embedded Attribute
2.Mark Embedded Id