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I noticed suddenly there is this exception in console. I played with CVS and had two output tabs open in the Output window (which was not in front). Other than that, I saw no symptoms of IDE being short of memory.
Created attachment 27496 [details] OOME
what OS? what jdk version? how big was the output? do you have enough free space on disk? please note that there are many possible OutOfMemoryException sources, the most frequent "heap" OOME being just one of them. This looks like a problem is java.nio memory mapping (which uses OS memory I think, not the java process one).
WinXP, 1.5.0_05, output was small, cca 100 lines, I have plenty of free disk space.
does it happen consistently or just one time issue? I've rechecked the java.nio documentation and it seemed your computer didn't have enough memory to perform the memory mapping. We do currenly the mapping only for a portion of the whole output file. So even for really big files we should be on the safe side. closing as works for me, cannot reproduce. please reopen if you have steps to reproduce. (at least on your machine)