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Created attachment 155824 [details] message log Product Version = NetBeans IDE Dev (Build 201508310002) Operating System = Windows 7 version 6.1 running on amd64 Java; VM; Vendor = 1.8.0_60 Runtime = Java HotSpot(TM) 64-Bit Server VM 25.60-b23 I was working on a relatively large project, where current java source in editor was around > 17000Lines. I used the "Navigator" window to locate a method, I noticed degradation in performance. later switched to "Tree" view of Navigator window (it took a while for window to load). Once Tree view loaded, I started scrolling down on the view,... then exception was thrown.
The tree view is debugging utility not a product which is not enabled in the releases.