I'm getting similar errors when I have a redmine installed in that gemset, perhaps that's your problem too.
Also I would suggest to upgrade to sunjava 7, with that I had much less java related errors in general.
If possible you should think about upgrading your ubuntu to 12.04, which is the current LTS, but I don't think that your problem is related to that.
If nothing of the first tips helps please provide the log that is mentioned in the crash.
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