"java.lang.ClassCastException: org.hibernate.internal.SessionFactoryImpl cannot be cast to org.hibernate.jpa.internal.EntityManagerFactoryImpl" using Hibernate in JBoss EAP

Issue

Application code creates an entity manager factory via Persistence.createEntityManagerFactory(String) using the code below:

import org.hibernate.jpa.internal.EntityManagerFactoryImpl;
        ...
        EntityManagerFactoryImpl entityManagerFactory = (EntityManagerFactoryImpl) Persistence.createEntityManagerFactory( "my-unit" );

This results in an exception:

... java.lang.ClassCastException: org.hibernate.internal.SessionFactoryImpl cannot be cast to org.hibernate.jpa.internal.EntityManagerFactoryImpl
        at org.myco.MyClass.unwrap(MyClass.java:99)
        ...