[jboss-user] [EJB 3.0] - Re: Hibernate3: Cannot simultaneously fetch multiple bags

[andydale]

Hi,

The "problem" comes from the following code:


  | private Collection<Role> roles = new ArrayList<Role>();
  | private Collection<Group> groups = new ArrayList<Group>();
  | 

A Collection is treated as a "bag".  You have have some possibilities to fix it.

An easy solution is to use the @CollectionID.  Another solution would be to change them to List<> and then use the @IndexColum, and the final solution is to change the to Set<>.  You must read up on Hibernate Collection mapping  first, to see whats suits your data model best.

Go to this URL:

http://www.hibernate.org/hib_docs/annotations/reference/en/html/entity.html#entity-mapping-association

Cheers,

Andy

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