I was having some trouble running Eclipse 3.3 Europa on Hardy Heron. It was unstable, crashing a lot, and hogging way more ram than it normally hogs.
Then I realized what I’d forgotten to do on this fresh install. I forgot to simply ‘sudo update-java-alternatives -s java-6-sun’ and voila, it works like a charm.
Eclipse doesn’t work well with the gjc java (the ‘free’ and default) Hopefully this little thing won’t be an issue in the future when sun java 7 (open java) is ready to rock the free world.