[jboss-user] [EJB 3.0] - Re: many to many mapping exception in EJB3

[Wolfgang Knauf]

Hi,

bi-directional mappings are a bit tricky: you always have to update BOTH sides of the mapping.

So, if you want to map a Skill to an User, this will NOT work:

user.getSkills().add ( mySkill);
  | entityManager.merge(user);

You will have to do something like this:
myUser.getSkills().add ( mySkill);
  | mySkill.getUsers().add (myUser);
  | entityManager.merge(myUser);

Hope this helps

Wolfgang

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