EntityManager save and return primary key

 package com.italktv.model.entity;

    
  
    
 import java.io.Serializable;
    
  
    
 import javax.persistence.Column;
    
 import javax.persistence.Entity;
    
 import javax.persistence.GeneratedValue;
    
 import javax.persistence.GenerationType;
    
 import javax.persistence.Id;
    
 import javax.persistence.Table;
    
  
    
 @Entity
    
 @Table(name = "t_user")
    
 public class User implements Serializable{
    
  
    
 	private static final long serialVersionUID = 1L;
    
 	@Id
    
 	@GeneratedValue(strategy = Generati