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The classes in xyzPU defined in mywebapp.war can access xyzPU defined in some.jar.
Means that entities in one PU can access entities in other PU ? Because although it's the same PU name, the PUs are different.
Or when I create/inject an EntityManagerFactory in mywebapp.war I can pass the # syntax PU name to get a EMF for the PU defined in some.jar (instead of mywebapp.war).