posted 11 years ago
The exact amounts depend entirely on the size of the applications and on what they do, so the only real way to tell is to measure.
It's true that the 128M default for PermGen space is borderline, making 256MB more suitable for a lot of apps, but the heap size requirements could be almost anything.
The secret of how to be miserable is to constantly expect things are going to happen the way that they are "supposed" to happen.
You can have faith, which carries the understanding that you may be disappointed. Then there's being a willfully-blind idiot, which virtually guarantees it.