[jboss-user] [JBoss Seam] - Re: ERROR: invalid large-object descriptor: 0 with postgreql

[c_eric_ray]

You cannot use an extended context with Blob. This is the reason you are getting the descriptor error. Make your persistence context type transactional.

See this post, Part 2, for a more detailed description: http://forum.hibernate.org/viewtopic.php?t=963566

Also, you might need to use the em.merge function to have the entity bean brought into the current EM context. You have to do this because the EM is injected each time the session bean is invoked. 

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