Hi !
Probably you want to access a relationship property when the entity bean is no
longer under control of the entity manager (a "detached" entity).
There are two ways around this problem:
a) set the fetch type to "EAGER"
@OneToMany(mappedBy="...", fetch=FetchType.EAGER)
| public Collection<MyChild> getChilds()
This causes the entity manager to load the child collection when the parent is
loaded. May be a big performance problem.
b) prefetch your childs when the entity bean is still under entity manager
control.
Imagine a find method of a session bean:
public MyParent findById (Integer id)
| {
| MyParent parent = this.entityManager.find(MyParent.class, id);
| parent.getChilds().size();
| }
"parent.getChilds().size();" forces loading of the childen.
Hope this helps
Wolfgang
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