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JBOSS AS7 7.1.1 - Entity not persisted and createNamedQuery fire exception

I'm trying to have the guestbook example running in the following environment: jboss as 7.1.1 final oracle jdk 1.7.0_04 maven 3.0.4 objectdb 2.4.0_04 installed as a module of jboss No IDE is used for building the Guestbook.war only maven.   My GuestDAO code is as follows: ... a JBoss-ObjectDB problem but also JBoss-Eclipse, JBoss-NetBeans (no support of JBoss 7 in NetBeans yet), etc. ObjectDB was adjusted to JBoss 6 , then to ...