"petemuir" wrote : My best guess as to why it fails from what you've said is that by passing the instance through the datamodel like that it has become unmanaged so cannot be removed - you can check this by calling entityManager.contains(). Setting by Id rather than instance might just work (use it with my.getId rather than rowIndex). Where should I set the breakpoint in my debugger to do an entityManager.contains() check? Or if it's better to output a FacesMessage with this value, where should I put that debugging line? anonymous wrote : And beware of the fact that a remove won't remove the entity from memory - it just detaches it from the persistence context. So the refreshed page after the delete would still show the removed entity in the list right? But if I look in my DB, am I correct to say I should no longer see it there (if things work correctly) even though it's still in memory? Next question is why does this happen - isn't entity-query EVENT-scoped, which means that on the next refresh it doesn't exist and has to hit the DB again? Thanks a lot. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4017709#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...