"JtaPlatformInaccessibleException: Unable to access TransactionManager or UserTransaction to make physical transaction delegate" using Hibernate in JBoss EAP 7

Issue

• Explicitly creating an un-managed entity manager factory / entity manager in application code

  // EMF/EM managed by application code rather than by JBoss
  EntityManagerFactory entityManagerFactory = javax.persistence.Persistence.createEntityManagerFactory("my-persist-unit");
  EntityManager entityManager = entityManagerFactory.create(); // this fails
  

• The exception below is raised during entity manager creation

  ... org.hibernate.resource.transaction.backend.jta.internal.JtaPlatformInaccessibleException: Unable to access TransactionManager or UserTransaction to make physical transaction delegate
          at org.hibernate.resource.transaction.backend.jta.internal.JtaTransactionCoordinatorImpl.makePhysicalTransactionDelegate(JtaTransactionCoordinatorImpl.java:229)
          ...
          at org.hibernate.jpa.internal.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:286)
          at com.myco.EntityManagerHelper.getEntityManager(EntityManagerHelper.java:99)
          ...
  

• It was observed that hibernate.transaction.jta.platform could be set in the persistence.xml to work around the exception.