That permanent generation had better provide some pretty damn amazing optimizations or I’m going to add it’s inventor to my list of people to track down and torture at next JavaOne. It turns out you can only reload a Tomcat webapp so many times before the PermGen space fills up and everything dies. That’s annoying enough in development but it means I can’t upload a new WAR file to our test server regularly without also bouncing Tomcat. Right now our continuous integration server (Bob the Builder) is doing just that after every commit so the server isn’t staying up all that long.

Mock objects for unit tests will also run afoul of PermGen space and apparently something in Eclipse does too because every so often it dies on me too. Sigh.