java.lang.IllegalArgumentException: Removing a detached instance com.test.User#5

Question

I have a java EE project using JPA (transaction-type=\"JTA\"), hibernate as provider. I write my beans to handle the CRUD things. The program running in JBOSS 7 AS.

Answer 1

In my experience, if I query an object from the DB then closed the entity manager then do a DB delete, the problem happens. Or if I copy that loaded object to another instance then do a delete, this problem also happens. In my opinion there are 2 things to keep note:

• The object must be in the same session that was created by the Entity Manager
• And the object mustn't be transferred to another object while the Entity Manager's session is still opened.

Cheers