hibernate persist not working

Question

I have a simple AppUser entity class and table in db APP_USERS . when i do a addAppUser from DAO class, I get below exception:

HTTP Status 500 - Request processing failed; nested exception is org.hibernate.PersistentObjectException: detached entity passed to persist: com.spring.model.AppUser

@Override
public void addAppUser(AppUser p) {
    Session session = this.sessionFactory.getCurrentSession();
    session.persist(p);
    logger.info("AppUser saved successfully, AppUser Details="+p);
}

Not sure how to resolve it. Same code works fine for persisting a different class's object. Did some research but could not find anything that could help.

Answer 1

The problem is that your AppUser comes from the outside, so it is not managed by hibernate. Call merge to reattach your DAO, ie make hibernate handle it again:

session.merge(p);

If you still run into an exception, you can try to see if the object is already in the session first, and then call update(obj) if it is, otherwise call merge(obj) .

For example:

if(session.contains(obj)) session.update(obj);
else session.merge(obj);

Answer 2

i had issue because i had the below naive code .. didn't notice it.

    @Id
    @Column(name = "enterid")
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private String enterid;

It was not able to autogenerate the enterid which is 'String' and it turned to null. I noticed that during debugging.

Hibernate: insert into app_users (enterid, lead, enable, password, approval, role, teamname) values (null, ?, ?, ?, ?, ?, ?)