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I did a full bringover of the NetBeans source and built it (I had to make a couple of tweaks to the build and run scripts - they still don't do jdk detection correctly on OS X). It runs fine. Then I took the full NetBeans source hierachy and merged it all into one source hierarchy - one big project. I did this so that I could use NetBeans to browse its own source code. Building the merged hierarchy worked fine. But when I tried to do a "Find..." an odd thing happened: the "Find..." operation actually completed and gave me a list of places where the string I was looking for occurred. But whenever I'd click on a link I'd get an OutOfMemoryError messages.log is useless in this case because OutOfMemoryErrors don't record a stack trace.
Created attachment 14566 [details] messages.log
I believe there are some known scalability issues with search; I don't know what the status of fixing them is. BTW, please don't file issues against the "ide" project - it's more of a placeholder for planned feature lists from a team that no longer exists (it should probably be removed from the list of things one can file a bug against, or taken over by QA for routing issues to the correct owners; Navigation Project belongs to me because I was on that team, but this issue could have gone into a black hole).
*** This issue has been marked as a duplicate of 19484 ***