Hi Marcell,
I removed hibernate.transaction.manager_lookup_class
, but there was no difference. I really don't know what is wrong in my codes. Maybe, it is the problem of using EJB3? I am currently using JBoss 4.2.2, Hibernate (3.2.4.sp1), Seam 2.0.1GA. Thank you very much.
Really don't know what is going on. I think you can create a JIRA issue and post the project there. Post the created issue here and I will also have a look. Really want to track this thing down. :D