ejbjar in ear doesn't get JPA persistence provider dependencies injected, which causes ClassNotFoundException referencing persistence provider from ejblib

my ejbjar inside an ear uses PersistenceContext annotation so that it should be a JPA subsystem as described in https://docs.jboss.org/author/display/AS7/Implicit+module+dependencies+for+deployments
I also use hibernate criterion classes in ejbjar but I'm getting CNFE during deployment of ear