Question

I have a class Node
Node.java

public class WebPage implements BusinessObject {
  @Id
  private Long       id;
  @ManyToMany
  @JoinTable(name = "childnodes")
  private Set<WebPage> references;   // nodes contained by this node
}

My requirements :

1. One node can reference many nodes.
2. One node can reference it self.
3. One node can be referenced by many nodes or not.

I want to do something like this :

1. Node A -> Node B (Node A references Node B and so on)
2. Node A -> Node C

3. Node A -> Node D

4. Node B -> Node E

5. Node B -> Node C

All steps run OK except the 5th one. I have an exception : Unique index or primary key violation: How can i tell Hibernate to DO NOT try to insert Node C but instead update it !

Answer 1

The problem was not on Hibernate behalf but on a bug in my code :\