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This bug was originally marked as duplicate of bug 174450, that is already resolved. This bug is still valid, so this seems to be another bug, but it might be related. Build: NetBeans IDE 7.1.2 (Build 201204101705) VM: Java HotSpot(TM) Client VM, 23.0-b21, Java(TM) SE Runtime Environment, 1.7.0_04-b20 OS: Windows XP Stacktrace: java.util.ConcurrentModificationException at java.util.Vector$Itr.checkForComodification(Vector.java:1156) at java.util.Vector$Itr.next(Vector.java:1133) at org.netbeans.modules.xml.sync.DataObjectSyncSupport.addRepresentation(DataObjectSyncSupport.java:140) at org.netbeans.modules.xml.text.TextEditorSupport$3.stateChanged(TextEditorSupport.java:247) at org.openide.text.CloneableEditorSupport.fireStateChangeEvent(CloneableEditorSupport.java:2347) at org.openide.text.CloneableEditorSupport.fireDocumentChange(CloneableEditorSupport.java:2330)
Created attachment 120142 [details] stacktrace
*** This bug has been marked as a duplicate of bug 213390 ***