Well it all depends, I don't think 1 GB RAM enough to run GlassFish. You should also consider resource demand for your applications and website traffic. Even though, if you wan to run My-SQL or another database type on the similar, then. For the OS type I'd suggest choose one you are most comfortable with.
In my opinion, you should opt CentOS or Debian both will work fine. Just install the Sun JVM on your machine, that's it.
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"I'm not anti-social; I'm just not user friendly"
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