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This bug was originally marked as duplicate of bug 230242, that is already resolved. This bug is still valid, so this seems to be another bug, but it might be related. Build: NetBeans IDE 7.4 Beta (Build 201307092200) VM: Java HotSpot(TM) 64-Bit Server VM, 23.25-b01, Java(TM) SE Runtime Environment, 1.7.0_25-b15 OS: Linux User Comments: tomzi: just doin a clean install Stacktrace: java.lang.IllegalStateException: An unfinished nested fold exists. at org.netbeans.core.output2.NbIO$IOFoldingImpl$NbIoFoldHandleDefinition.startFold(NbIO.java:616) at org.openide.windows.FoldHandle.startFold(FoldHandle.java:81) at org.netbeans.modules.maven.execute.cmd.ExecutionEventObject$Tree.startFold(ExecutionEventObject.java:212) at org.netbeans.modules.maven.execute.CommandLineOutputHandler$Output.run(CommandLineOutputHandler.java:330) at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1432) at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2042)
Created attachment 137381 [details] stacktrace
The problem is similar to bug 232316. In this case, using proposed method silentStartFold(boolean) will prevent this kind of exceptions. *** This bug has been marked as a duplicate of bug 232316 ***