Use of UserTransaction object inside of CDI or enterprise Beans

Issue

• How CDI Beans with @Transactional annotation behave if called in an EJB context?
• Why it is not possible to use a UserTransaction object inside of a CDI bean?
• Why the use of transaction inside of CDI Beans works differently after update?

• If a CDI bean use @Resource to inject a UserTransaction object and it is called from an EJB there is an Exception after updating the EAP instance from version 6.4 to 7.x

  Caused by: javax.naming.NameNotFoundException: UserTransaction [Root exception is java.lang.IllegalStateException: WFLYEJB0137: Only session and message-driven beans with bean-managed transaction demarcation are allowed to access UserTransaction]