What I have:
I need to update my entity. I use Hibernatee conversation, that means that we already have entity in the session cache.
public void handle(Request request, Session session) {
MyEntity updatedEntity = request.getEntity();
session.merge(updatedEntity); //rewrite all lazy collections
}
So I send object to client, client full up the object and send it back for update.
What the problem:
Lazy collections aren't sent to the client. As a result, if lazy collection hasn't been empty, than it will be overriden in session.merge(updatedEntity) string
It happens because client knows nothing about element in those collections
Question:
How two merge entity in correct way? Means without rewriting lazy collections.
EDIT:(how I work with my collections)
public class MyEntity {
@OneToMany(cascade = CascadeType.ALL, fetch = FetchType.EAGER, orphanRemoval = true)
@JoinColumn(name = "entity_id")
private List<AnotherEntity> anotherEntities;
public void setAnotherEntities(List<AnotherEntity> anotherEntities) {
// we must work with the same instance of list (again, because of orphanRemoval)
this.anotherEntities.clear();
this.anotherEntities.addAll(anotherEntities);
}
}
I think that CascadeType.ALL is the problem
You may use instead
cascade = {CascadeType.PERSIST, CascadeType.REFRESH, CascadeType.DELETE})
You may also add to this set any other cascade option you need.
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