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This issue was originally marked as duplicate of issue 138686, that is already resolved. This issue is still valid, so this seems to be another issue, but it might be related. Build: NetBeans IDE Dev (Build nbms-and-javadoc-4251-on-091107) VM: Java HotSpot(TM) 64-Bit Server VM, 10.0-b22, Java(TM) SE Runtime Environment, 1.6.0_06-b02 OS: Windows Vista, 6.0, amd64 User Comments: andyr: open ide Stacktrace: java.lang.IllegalStateException: NbEditorDocument.createEditor(): ui=com.sun.java.swing.plaf.windows.WindowsEditorPaneUI@487096f3, kit=javax.swing.JEditorPane$PlainEditorKit@57c650ac, pane=org.openide.text.QuietEditorPane[,0,0,0x0,invalid,layout=javax.swing.plaf.basic.BasicTextUI$UpdateHandler,alignmentX=0.0,alignmentY=0.0,border=javax.swing.plaf.basic.BasicBorders$MarginBorder@1cda7939,flags=296,maximumSize=,minimumSize=,preferredSize=,caretColor=javax.swing.plaf.ColorUIResource[r=0,g=0,b=0],disabledTextColor=javax.swing.plaf.ColorUIResource[r=128,g=128,b=128],editable=true,margin=javax.swing.plaf.InsetsUIResource[top=3,left=3,bottom=3,right=3],selectedTextColor=javax.swing.plaf.ColorUIResource[r=255,g=255,b=255],selectionColor=javax.swing.plaf.ColorUIResource[r=51,g=153,b=255],kit=javax.swing.JEditorPane$PlainEditorKit@57c650ac,typeHandlers=] at org.netbeans.modules.editor.NbEditorDocument.createEditor(NbEditorDocument.java:175) at org.openide.text.CloneableEditor$DoInitialize.initCustomEditor(CloneableEditor.java:497) at org.openide.text.CloneableEditor$DoInitialize.initVisual(CloneableEditor.java:599) at org.openide.text.CloneableEditor$DoInitialize.run(CloneableEditor.java:291) at org.netbeans.core.windows.WindowManagerImpl$Exclusive$1.run(WindowManagerImpl.java:1317) at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
Created attachment 90835 [details] stacktrace
Exception reports #287666 and #289263 are irrelevant, because they came from the build before issue #138686 was fixed (for the last time), which was in the build 200910280201. The last (so far) exception report #298296 is from the build after the fix and so probably indicates some real problem.
This issue already has 5 duplicates see http://statistics.netbeans.org/exceptions/detail.do?id=160924
I will watch this.
Bug prior to 7.0, not touched for the last 2 years --> P4.
The last time the exception happened is in 2009. Closing as works for me.