How do you add new items to a 1-Many on a detched parent object?
Our use case is as follows.
1. Fetch parent (with empty but non-null collection), parent is now detached
2. parent.add( new Child() )
3. parentDao.update( parent )
We receive an OptimisticLockException on the child class when trying to add it to the 1-Many. The same use case all within the same transaction works fine.
Any ideas?
Test Case:
public void doSetup()
{
parent = new Parent()
beginTransaction();
parentDao.persist( parent );
commitTransaction();
}
// this test fails with OptimisticLockException
@Test
public void testAddChildrenAndUpdate()
{
Child c = new Child();
Parent p = parentDao.find( this.parent.getId() );
parent.addChild( c );
beginTransaction();
parentDao.update( parent ); // fails here!
commitTransaction();
}
@Test
public void testAddChildrenAndUpdate()
{
Child c = new Child();
beginTransaction();
Parent p = parentDao.find( this.parent.getId() );
parent.addChild( c );
parentDao.update( parent ); // this works
commitTransaction();
}
class ParentDao
{
public Parent update( Parent p )
{
entityManager.flush();
return entityManager.merge( p );
}
}
As always, any help is greatly appreciated.
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