Thanks everyone.
In section "6.2 Persistence Unit Packaging" of JSR 220 say clarity:
"A persistence unit may be packaged within one or more jar files contained within a WAR or EAR ...."
I was confused, because in "6.2.2 Persistence Unit Scope" say that "An EJB-JAR, WAR, application client jar, or EAR can define a persistence unit". This last premise confused me, possible influenced by this large and hard working day;
Thank's ljnelson, Arif, Felipe and Marina
[Message sent by forum member 'angelcervera' (angelcervera_at_silyan.com)]
http://forums.java.net/jive/thread.jspa?messageID=381099