[jboss-user] [EJB 3.0] - Re: Manually created Hibernate EntityManager vs. injected on

[skajotde]

JBoss uses EnityManager which is involved with TransactioManager and em is proxy so em.find/em.save is thread safe.

Your code is also thread safe because beans are thread-safe but creating emtnity manager factory has high cost (6 seconds on my machine). 

Persistence.createEntityManagerFactory("em");

Should be invkoned once.

If you move creating emf to singleton then there is question if emf.createEntityManager(); has proper transaction if you are using annotations on beans. If you using transactional filter (eg. on web.xml in web apps) which global begin/commit transaction there should be no problem.

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