In my project(JPA2.0,EclipseLink,mysql),I have a entity listener. For example,when entity updated, the method with annotation '@postupdate' will be triggered. This works well.

But sometimes,user updated the entity(getEntityManager().merge), JPA provider will check whether entity's property changed. If there is no change in entity, JPA provider will not update this entity.(This is cache mechanism,I think). So the the method marked '@postupdate' will not be triggered. But I need the '@postupdate' method triggered at this situation. How to do it?

When keep the same EntityManager running merge (), remove (), and find () or when the EJB QL query, the life-cycle events are run with a predefined set to run. Sometimes very entity bean class availability has to be notified of these events to occur.