[jboss-user] [Persistence, JBoss/CMP, Hibernate, Database] - javax.ejb.EJBException: java.lang.IllegalArgumentException:

[secured256]

Hi all. I need your help.

I get the following Exception while stateless bean function invocation   : 

javax.ejb.EJBException: java.lang.IllegalArgumentException: Wrong target. class "Implementation Class" for "function signature" 

it accrues if persistence used inside function. 
I use Jboss5.0.1 with jdk 1.6  and MySQL 5

thanks in advance.

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