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You should check whether there are multiple jars containing pl/akonet/zpk/raporty/bean/RaportBean class. By the way, any specific reason why you are using such a old JBoss AS version?
Thanks man a lot. You were right.
I'm using such old version of jboss cause app is running there for a long time
and i'm about to do some changes only.
Thanks again for your help.