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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