GlassFish 4.1 + Hibernate 4.3 = Cannot override mapping through orm.xml

Question

I get this exception when I try to override the mapping of an entity through the orm.xml file:

2014-11-10T20:08:30.815+0100|Severe: Exception while preparing the app : [PersistenceUnit: irems-main] Unable to build Hibernate SessionFactory
org.hibernate.DuplicateMappingException: Duplicate class/entity mapping testing_ejb.MyAddress
at org.hibernate.cfg.Configuration$MappingsImpl.addClass(Configuration.java:2835)
at org.hibernate.cfg.AnnotationBinder.bindClass(AnnotationBinder.java:816)
at org.hibernate.cfg.Configuration$MetadataSourceQueue.processAnnotatedClassesQueue(Configuration.java:3788)
at org.hibernate.cfg.Configuration$MetadataSourceQueue.processMetadata(Configuration.java:3742)
at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1410)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1844)
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl$4.perform(EntityManagerFactoryBuilderImpl.java:850)
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl$4.perform(EntityManagerFactoryBuilderImpl.java:843)
at org.hibernate.boot.registry.classloading.internal.ClassLoaderServiceImpl.withTccl(ClassLoaderServiceImpl.java:398)
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:842)
at org.hibernate.jpa.HibernatePersistenceProvider.createContainerEntityManagerFactory(HibernatePersistenceProvider.java:152)
at org.glassfish.persistence.jpa.PersistenceUnitLoader.loadPU(PersistenceUnitLoader.java:199)
at org.glassfish.persistence.jpa.PersistenceUnitLoader.<init>(PersistenceUnitLoader.java:107)
at org.glassfish.persistence.jpa.JPADeployer$1.visitPUD(JPADeployer.java:223)
at org.glassfish.persistence.jpa.JPADeployer$PersistenceUnitDescriptorIterator.iteratePUDs(JPADeployer.java:510)
at org.glassfish.persistence.jpa.JPADeployer.createEMFs(JPADeployer.java:230)
at org.glassfish.persistence.jpa.JPADeployer.prepare(JPADeployer.java:168)

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You may download the SSCCE from here

It contains nothing more than two projects (EAR + EJB) and a mapped entity managed by a bean. The respective entity is marked with @Entity, and mapped in the orm.xml

Error occurs at deployment.

Answer 1

Change your entity declaration in orm xml as follows:

<entity name="Employee" class="testing_ejb.MyAddress" metadata-complete="false">
</entity>

Also the META-INF/orm.xml must reside next to your persistence.xml configuration file. Move the orm.xml from the child jar to where the root persistence.xml is located.