Question

In my Hibernate Application i’m using create a ValueObject class

@Entity
@Table(name="user")
public class UserVO{

    @Id
    @Column(name="S_ID")
    private String s_id;

    @Column(name="FIRSTNAME")
    private String firstName;

    @Column(name="LASTNAME")
    private String lastName;
 }

and in my Service class i’m writing like this

public void createOrUpdateUser(UserVO userVO) {
        userDAO.createOrUpdateUser(userVO);
    }

and in my DAO class i’m writing like this

private EntityManager entityManager;
public void createOrUpdateUser(UserVO userVO) throws DataAccessException {
        entityManager.persist(userVO);
    }

now i’m calling createOrUpdateUser(userVO) but it give error

Caused by: org.hibernate.id.IdentifierGenerationException: ids for this class must be manually assigned before calling save()

Actually my data base i have created one trigger for user table to generate unique id for s_id column is their any problem for trigger..please suggest me..

Answer 1

ID column must not be null, whatever you do in database driver, will only be trigger before/after insert or any other operation, But according to error it is giving error before any error.

Set something to ID values or try something
@GeneratedValue(strategy = GenerationType.IDENTITY)