Dear Kees Jan,
I'm not a Java expert, so my knowledge about the JVM and Administrating was worthless. That's why I came to the BOF.
With "learned new stuff" I mean almost everything in the session

The java-monitoring tool, FindBugs, the tips and tricks. How to tune, interesting options, where to look first when you have unexpected behaviour, How the GC works, ...
With the new knowledge I can search for more information and learn more and maybe become an expert

.
And what to do differently? I'll install the java-monitor tool and see how my current java-programs runs. My code is up and running, but maybe there are some improvements.
And I really enjoyed your enthousiam when explaining the puzzlers.
One of the best sessions I participated on Devoxx.
grtz
Robin