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This bug was originally marked as duplicate of bug 214651, that is already resolved. This bug is still valid, so this seems to be another bug, but it might be related. Build: NetBeans IDE Dev (Build 20140827-b75c100bfb1c) VM: Java HotSpot(TM) 64-Bit Server VM, 24.65-b04, Java(TM) SE Runtime Environment, 1.7.0_67-b01 OS: Linux User Comments: tmysik: tried to expand html5 project in Projects view Stacktrace: java.lang.AssertionError: map.size()=4 entries.size()=1 at org.openide.nodes.EntrySupportDefault.checkConsistency(EntrySupportDefault.java:247) at org.openide.nodes.EntrySupportDefault.setEntries(EntrySupportDefault.java:279) at org.openide.nodes.EntrySupport.setEntries(EntrySupport.java:83) at org.openide.nodes.Children$Keys$2.run(Children.java:1556) at org.openide.util.Mutex$1Exec.run(Mutex.java:1259) at org.openide.nodes.Children$ProjectManagerDeadlockDetector.execute(Children.java:1921)
Created attachment 148920 [details] stacktrace
Created attachment 151911 [details] stacktrace editing code
*** This bug has been marked as a duplicate of bug 229804 ***