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This oome is probably caused by bad user setup, but the LinkedList in HgCommand.java with ~400k items can be switched to ArrayList nonetheless.
fix: http://hg.netbeans.org/core-main/rev/28678a0c98ad
Integrated into 'main-golden', will be available in build *201302122300* on http://bits.netbeans.org/dev/nightly/ (upload may still be in progress) Changeset: http://hg.netbeans.org/main-golden/rev/28678a0c98ad User: Ondrej Vrabec <ovrabec@netbeans.org> Log: #225982 - java.lang.OutOfMemoryError: GC overhead limit exceeded switching to ArrayList