Please take this up on the hibernate forums until you can establish that your issue is caused by JBoss Cache itself. Hibernate controls what is stored in the 2nd level cache and whether the cached MovieCategory.movies collection gets invalidated out of the cache when you change a Movie. JBC just does what it's told to do by Hibernate. Suggestions for getting good free help w/ open source software -- discuss on forums before filing bug reports; don't mark your reports as "Critical" but let the developers make that determination, and don't say stuff like "Please, help me! This problem is critical for me !". Unless of course you want to buy a support contract, in which case you can do all these things and we won't complain at all. ;-) View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4109050#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...