Hi,

just writing to let you know of a performance bug we hit with certain "out-of-the-box" Hibernate combo with Maven build system. I don't know who is responsible of providing Hibernate builds in the Maven repository, so I'll just write this here, in case anyone happens to Google upon it :).

We're using Hibernate Entity manager 3.4.0 GA and the Maven build system. In the Maven dependencies, the entity manager has as its dependency SLF4J-API-1.4.2 library. The JEE platform underneath uses JDK logging, so we included SLF4J-JDK14-1.4.2 in the setup (following the SLF4J guidelines). Now, there happens to be a nasty bug in that version of JDK14-logger implementation:
http://bugzilla.slf4j.org/show_bug.cgi?id=72

This bug caused in, some cases, > 80 % of the CPU time being spent in "phantom logging". Problem was solved by upgrading the SLF4J JDK14 logger implementation.

Cheers, Joni

why do you use such an old version? latest Hibernate uses SLF4k 1.6.1

I guess you're not using the reference repository. see http://community.jboss.org/wiki/MavenGettingStarted-Users