Maris Orbidans schrieb:
Let's remember good old EJB's. Inject an EntityManager in a session
bean facade and EJB container will handle all concurrency issues. No
need to write any boilerplate code.
that´s where i come from. problem is, that you domain object aren´t able
to lazily fetch attached data from database, unless you manage the EM
yourself (maybe via Stateful SB, like seam does you encourage to).
there are situations in which SBs are the best way to implement DAOs. I
doubt, these are the majority.
BTW I have seen that some people use OpenEntityManagerInViewFilter and
map it to url pattern "/*". It seems that an EntityManager would be
created every time a static web resource is accessed. Isn't that
terrible ?
i don´t know if OpenEntityManagerInViewFilter actually opens an EM.
my solution wont, but instead provide a Context for EMs, so that they
can be created and managed (and yes, more than one ;) automatically on
demand.
cu uwe
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