java.lang.ClassCastException: sun.reflect.generics.reflectiveObjects.TypeVariableImpl cannot be cast to java.lang.Class

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sun.reflect.generics.reflectiveObjects.TypeVariableImpl cannot be cast to java.lang.Class
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sun.reflect.generics.reflectiveObjects.TypeVariableImpl cannot be cast to java.lang.Class
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sun.reflect.generics.reflectiveObjects.TypeVariableImpl cannot be cast to java.lang.Class
java.lang.ClassCastException: sun.reflect.generics.reflectiveObjects.TypeVariableImpl cannot be cast to java.lang.Class
at oracle.toplink.essentials.internal.ejb.cmp3.metadata.accessors.objects.MetadataAccessibleObject.getRawClass(MetadataAccessibleObject.java:120)
at oracle.toplink.essentials.internal.ejb.cmp3.metadata.MetadataHelper.isEmbedded(MetadataHelper.java:732)
at oracle.toplink.essentials.internal.ejb.cmp3.metadata.accessors.ClassAccessor.buildAccessor(ClassAccessor.java:193)
at oracle.toplink.essentials.internal.ejb.cmp3.metadata.accessors.ClassAccessor.processAccessorFields(ClassAccessor.java:541)
at oracle.toplink.essentials.internal.ejb.cmp3.metadata.accessors.ClassAccessor.processAccessors(ClassAccessor.java:567)
at oracle.toplink.essentials.internal.ejb.cmp3.metadata.accessors.ClassAccessor.processMappedSuperclass(ClassAccessor.java:1128)
at oracle.toplink.essentials.internal.ejb.cmp3.metadata.accessors.MappedSuperclassAccessor.process(MappedSuperclassAccessor.java:63)
at oracle.toplink.essentials.internal.ejb.cmp3.metadata.accessors.ClassAccessor.processMappedSuperclasses(ClassAccessor.java:1138)
at oracle.toplink.essentials.internal.ejb.cmp3.metadata.accessors.ClassAccessor.process(ClassAccessor.java:495)
at oracle.toplink.essentials.internal.ejb.cmp3.metadata.MetadataProcessor.processAnnotations(MetadataProcessor.java:240)
at oracle.toplink.essentials.ejb.cmp3.persistence.PersistenceUnitProcessor.processORMetadata(PersistenceUnitProcessor.java:370)
at oracle.toplink.essentials.internal.ejb.cmp3.EntityManagerSetupImpl.predeploy(EntityManagerSetupImpl.java:607)

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