You can definitely do this from a filter.  I have a servlet that gets an 
EntityManager.  It must get a transaction to work!  It can do queries without a 
transaction but it cannot do writes without one.  As for why it can't find a 
transaction, I have no idea.  Maybe post some of your persistence configuration 
stuff?  With my setup it works no problem, and a Servlet is not very different 
from a Filter.

But in general, most things like that should happen in Seam components.


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