My program has three different managed persistence context. In one form, I use two entity from two different context. I'm having IllegalArgumentException exception on Seam code because it tries use contains in persistence context that don't have the right entity mapped. org.jboss.seam.interceptors.ManagedEntityIdentityInterceptor (at line 112): | for (String persistenceContextName: pcs) | { | Object persistenceContext = Component.getInstance(persistenceContextName); | boolean managed; | Object id; | if (persistenceContext instanceof EntityManager) | { | EntityManager em = (EntityManager) persistenceContext; | managed = em.isOpen() && em.contains(value); | id = managed ? PersistenceProvider.instance().getId(value, em) : null; | I put a try-catch around "managed = ..." and it works normally. I don't know exactly how this should work, but I think this is a bug. Thanks, View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3989315#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...