| An application packaging dom4j.jar in the application was deploying without issue in EAP 7.1 CP5, in CP6 after dom4j update from 1.x to 2.x it now throws a class cast. It looks like org.hibernate.internal.util.xml.XMLHelper has some code to flip the TCCL, but I am not sure which classloader it is passing in, we should be having JPA/HIbernate in JBoss flip the TCCL to be the classloader of the EAP JPA/Hibernate class so that it uses the dom4j in JBoss and does not try to load one from the application.
11:26:41,546 ERROR [org.jboss.msc.service.fail] (ServerService Thread Pool -- 19) MSC000001: Failed to start service jboss.persistenceunit."helloWorld.ear/helloWorld-jpa.jar#helloWorld-jpa.jar": org.jboss.msc.service.StartException in service jboss.persistenceunit."helloWorld.ear/helloWorld-jpa.jar#helloWorld-jpa.jar": java.lang.ClassCastException: org.dom4j.DocumentFactory cannot be cast to org.dom4j.DocumentFactory
at org.jboss.as.jpa.service.PersistenceUnitServiceImpl$1$1.run(PersistenceUnitServiceImpl.java:195)
at org.jboss.as.jpa.service.PersistenceUnitServiceImpl$1$1.run(PersistenceUnitServiceImpl.java:125)
at org.wildfly.security.manager.WildFlySecurityManager.doChecked(WildFlySecurityManager.java:640)
at org.jboss.as.jpa.service.PersistenceUnitServiceImpl$1.run(PersistenceUnitServiceImpl.java:209)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
at org.jboss.threads.JBossThread.run(JBossThread.java:320)
Caused by: java.lang.ClassCastException: org.dom4j.DocumentFactory cannot be cast to org.dom4j.DocumentFactory
at org.dom4j.DocumentFactory.getInstance(DocumentFactory.java:92)
at org.hibernate.internal.util.xml.XMLHelper$1.doWork(XMLHelper.java:33)
at org.hibernate.internal.util.xml.XMLHelper$1.doWork(XMLHelper.java:27)
at org.hibernate.boot.registry.classloading.internal.ClassLoaderServiceImpl.workWithClassLoader(ClassLoaderServiceImpl.java:358)
at org.hibernate.internal.util.xml.XMLHelper.<init>(XMLHelper.java:26)
at org.hibernate.envers.boot.internal.EnversServiceImpl.initialize(EnversServiceImpl.java:115)
at org.hibernate.envers.boot.internal.AdditionalJaxbMappingProducerImpl.produceAdditionalMappings(AdditionalJaxbMappingProducerImpl.java:99)
at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.complete(MetadataBuildingProcess.java:288)
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.metadata(EntityManagerFactoryBuilderImpl.java:848)
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:875)
at org.jboss.as.jpa.hibernate5.TwoPhaseBootstrapImpl.build(TwoPhaseBootstrapImpl.java:44)
at org.jboss.as.jpa.service.PersistenceUnitServiceImpl$1$1.run(PersistenceUnitServiceImpl.java:167)
... 7 more
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