Hibernate many-to-many data retrieval, via query

Question

Please help me, I think there is something that I am not doing correct. I have User and Contact, that are in Many-to-Many relation.

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Answer 1

In the XML mapping Contact, the mapping of userSet is completely wrong:

It should be:

It looks to me like you copy-and-pasted this from User and then didn't update it.

Why are you using XML rather than annotations? XML is much more error-prone, as you can see. In addition, a lot of these settings should be defaulted correctly by Hibernate. If you had just left out some of these attributes, it probably would have worked fine.