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This bug was originally marked as duplicate of bug 166236, that is already resolved. This bug is still valid, so this seems to be another bug, but it might be related. Build: NetBeans IDE 7.3 Beta 2 (Build 201211062253) VM: Java HotSpot(TM) 64-Bit Server VM, 23.3-b01, Java(TM) SE Runtime Environment, 1.7.0_07-b11 OS: Windows 7 Stacktrace: org.openide.util.lookup.ALPairComparator$DuplicatedPairException: Duplicate pair in treePair1: org.netbeans.modules.profiler.ProfilerControlPanel2$Listener pair2: org.netbeans.modules.profiler.SnapshotResultsWindow$SnapshotListener index1: -1 index2: -1 item1: org.netbeans.modules.profiler.ProfilerControlPanel2$Listener@77239667 item2: org.netbeans.modules.profiler.SnapshotResultsWindow$SnapshotListener@7259c61f id1: 63de57df id2: 55c62fa2 at org.openide.util.lookup.ALPairComparator.compare(ALPairComparator.java:69) at org.openide.util.lookup.ALPairComparator.compare(ALPairComparator.java:54) at java.util.TreeMap.put(TreeMap.java:545) at java.util.TreeSet.add(TreeSet.java:255) at org.openide.util.lookup.AbstractLookup.getPairsAsLHS(AbstractLookup.java:332) at org.openide.util.lookup.MetaInfServicesLookup.beforeLookup(MetaInfServicesLookup.java:154)
Created attachment 130220 [details] stacktrace
There are four exceptions somehow duplicated to this issue - the first three have nothing to do with profiler and the last one is from ide in unstable state (after multiple OOME) into which it is unlikely it will get again.