The garbage collector does _not_ play well with the swap file. It causes each page belonging to the Java heap to be regularly paged in. Often. Several times per garbage collection pass, in fact.
So whereas a system which stuck to C or C++ will still run at full speed when I load 550 MB of programs in a 512 MB of RAM, a 100% Java system would trash to death at that point. (In fact, see point 2: much sooner than that.)
Or if only 300k out of that is Java stuff, it will act all elbows to the other apps. It will keep bringing its own pages in, and forcing everyone else to do with less memory.
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