Hi Sanjeep,
I verified my ear file and everything is okay. The answer for the second question, I use <persistence-context-ref> in the web.xml. Fortunately I was able to find the reason for my problem after hours of reading in the glassfish log-files. I tried to close the lookuped entitymanager as I did in the application managed mode. So it was my fault! :-(
Anyway, thanks everybody for helping me :-)
Greets Benjamin
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