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modification for chapter 6's persistenceContextCollision

 
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I modified this example:



Our expected result is collision:


javax.ejb.EJBException: There is an active transactional persistence context for the same EntityManagerFactory as the current stateful session bean's extended persistence context

 
Himai Minh
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To make it work, let the stateful bean starts a new transaction instead of using the propagated transaction:


Reference:http://shengwangi.blogspot.com/2015/11/understand-persistence-context-collision.html
 
Himai Minh
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The reason why I suggested this modification because  the original code demonstrated another concept , not pc collision.
The original code tells us that an stateful bean  with container managed transaction  cannot run in a UserTransaction.
The output error message is actually:

javax.ejb.EJBException: java.lang.IllegalStateException: Bean is associated with a different unfinished transaction



Original code as Audit bean is stateless with transaction scoped PC and Department manager bean as stateful with extended PC.






 
It is sorta covered in the JavaRanch Style Guide.
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