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As we all know, there are multiple reasons of OutOfMEmoryError (see first answer). Why there is only one exception covering all these cases instead of multiple fine-grained ones inheriting from OutOfMEmoryError?
I’d expect because you really can’t do anything else when that happens: it almost doesn’t matter WHY you ran out, since you’re screwed regardless. Perhaps the additional info would be nice, but…
I know tomcat tries to do this “Out Of Memory Parachute” thing, where they hold onto a chunk of memory and try and release it, but I’m not sure how well it works.