*-to-one relationships not returning consistent/unique obj.

eepstein · **Posted:** Fri Apr 23, 2004 8:07 pm

Given the following:

Code:

    PersistentObject parent = new PersistentObject(); 
    parent.setName("root"); 
    PersistentObject child = new PersistentObject (); 
    child.setName("leaf"); 

    child.setParent(parent); 
    parent.getChildren().add(child); 

    session.save(parent); 

I get 2 records in the DB as expected and everything looks great. In particular, child.getParent()==parent evaluates to true. Then,

Code:

    session.refresh(parent); // pick-up values set by triggers. 
    session.refresh(child); // pick-up values set by triggers. 

Now child.getParent()==parent evaluates to false! A bit surprising. So, trying a lengthier approach:

Code:

    session.evict(parent); 
    session.evict(child); 

    parent = session.load(PersistentObject, parent.getId()); 
    child = session.load(PersistentObject, child.getId()); 

Once again child.getParent()==parent evaluates to false! Calling get() rather than load() produces the same result.

I thought Hibernate uniques the objects. It looks like the uniqueness is not being enforced in a way that applies to *-to-one relationships.

Is this a bug? Is this related to the equals() issue that received much discussion lately?

emmanuel · **Posted:** Sat Apr 24, 2004 6:39 am

Most likely a getter/setter broken or your equals implementation leading to that issue

eepstein · **Posted:** Sat Apr 24, 2004 5:06 pm

The session accessor was returning a new Session on each invocation.