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Is there a quickstart example that uses EntityManager with transactions from a servlet ?

Solution Verified - Updated 2014-05-06T06:00:47+00:00 -

Issue

We cannot find a quickstart example that uses EntityManager with transactions from a Servlet. Do I need to use a stateless Session Bean?
How can we configure the EntityManager in a Servlet ?
What is the difference in using @EJB and the CDI @Inject while injecting the Bean ?
Is there any advantage of using the @Inject as oppossed to using the @EJB ?

Environment

Red Hat JBoss Enterprise Application Platform (EAP)
- 6.x

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