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Is there better support for this purpose integrated in hibernate 3.5 or should I still use a external connection pool like c3p0 or apache DBCP?
As far as I'm informad, there are no new related to this issue in upcoming hibernate 3.5.
Anyway you still can use a external connection pool like c3p0 or apache DBCP if you work with tomcat.
In my project I also use tomcat and I'm using Hiberante3.5 CR2 with c3p0 pool.
I use c3p0 pool because since latest versions the pool is viewable/controllable via JMX (jconsole).