[jboss-user] [JBoss Seam] - Re: Seam does not work when using with DAO (No transaction..
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Wed Nov 21 10:17:19 EST 2007
"vietbird" wrote : For various reasons, I need to use Seam with a DAO layer. I try the JPA example (comes with Seam 2.0.0.GA) with WAS 18.104.22.168. It works fine.
| When I add the DAO layer (i.e. no EntityManager is used within the Action classes, DB operations are carried out through DAO methods), all operations (add new user, book new hotel, searching) work EXCEPT the CANCEL booking (which call DAO remove() method). The call is OK, but nothing seems to happen, there is no "delete from..." query logged to the log file.
| I try to add a flush() call right after the remove() call, but error occurs. For unknown reason, there is no transaction!!! below is the trace:
| [21/11/07 11:37:08:249 EST] 0000001e application E javax.persistence.TransactionRequiredException: no transaction is in progress
| javax.faces.el.EvaluationException: javax.persistence.TransactionRequiredException: no transaction is in progress ...
| Why the call to remove() has no effect?
| Why there is no transaction here? Should transaction be started automatically for each method inside the Action classes?
| Do you have any idea how to fix the problem?
Try to load the entity from DB and then remove/delete.
| SomeEntity entityBean = entityManager.find(SomeEntity.Class, id);
Hope this helps.
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