Hi Sergio,
have you tried putting persistence.xml into the META-INF directory of the ear file and reference your two entity jars by
<jar-file>lib/base-entities.jar</jar-file>
<jar-file>lib/other-entities.jar</jar-file>
from within the persistence.xml. Do not include a persistence.xml in entity jars in this case. Please also see the JPA spec, 6.2 Persistence Unit Packaging for more information.
-- markus.
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