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The special HashMap used in HeapWalker creates a memory mapped file in temporary directory, it can be over 100MB. On Windows these files aren't removed after HeapWalker or NetBeans are closed, leaving them in the filesystem. This can cause serious problems when filling up all disk space as typically TEMP directory is located on system volume on Windows.
This is Windows only issue caused by JDK bug #6359560
Workaround was used to fix this problem. Files are deleted on subsequent NetBeans startup.
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