userCourse= userCourseService.create(userCourse,user,course,state);
		 userCourse.setCourse(course);
		 userCourse.setUser(user);
		 userCourseService.update(userCourse );

 public UserCourse create(UserCourse userCourse,User user,Course course,String state) {
		 
		Session session = sessionFactory.getCurrentSession();
		session.beginTransaction();
		userCourse.setState(state);
		Integer id = (Integer) session.save(userCourse);
		userCourse.setId(id);
        session.getTransaction().commit();
		 
		return userCourse;
	}; 

public UserCourse update(UserCourse userCourse ) {
		 
		Session session = sessionFactory.getCurrentSession();
		session.beginTransaction();
		session.merge(userCourse);
		session.getTransaction().commit();
		 
		return userCourse;
	};

@Entity
@Table(name="USER_COURSE")
public class UserCourse  implements Serializable{
	private static final long serialVersionUID = 1L;
	@Id
	@GeneratedValue
	@Column(name="ID")
	private int id;
	 
	@ManyToOne(fetch = FetchType.LAZY)
	@JoinColumn(name = "ID_USER", nullable = true)
	private User user;
	 
	@ManyToOne(fetch = FetchType.LAZY)
	@JoinColumn(name = "ID_COURSE", nullable = true)
	private Course course;
	@Column(name="state")
	private String state;
	@Column(name="grade")
	private int grade;

public UserCourse read(User user,Course course) {
		 
		Session session = sessionFactory.getCurrentSession();
		session.beginTransaction();
		//UserCourse course = (UserCourse) session.get(UserCourse.class, idUser,idCourse);
	    UserCourse userCourse = (UserCourse)   session.createQuery("from UserCourse u where u.user="+user+" , u.course="+course).list().get(0);
	    session.getTransaction().commit();
	   
	    
		return userCourse;
	}