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This bug was originally marked as duplicate of bug 250817, that is already resolved. This bug is still valid, so this seems to be another bug, but it might be related. Build: NetBeans IDE 8.1 (Build 201510222201) VM: Java HotSpot(TM) 64-Bit Server VM, 25.60-b23, Java(TM) SE Runtime Environment, 1.8.0_60-b27 OS: Windows 10 User Comments: GUEST: I have selected 130 files, and NetBeans became so slow that I need to close. It was consuming 800mb of my memory. Stacktrace: java.lang.OutOfMemoryError: GC overhead limit exceeded at java.util.TreeMap.put(TreeMap.java:577) at java.util.TreeSet.add(TreeSet.java:255) at org.openide.util.lookup.AbstractLookup$R.initItems(AbstractLookup.java:1167) at org.openide.util.lookup.AbstractLookup$R.allItemsWithoutBeforeLookup(AbstractLookup.java:1124) at org.openide.util.lookup.AbstractLookup$R.allItems(AbstractLookup.java:1108) at org.openide.util.lookup.AbstractLookup$R.allItems(AbstractLookup.java:1101)
Created attachment 163801 [details] stacktrace