java.lang.IllegalStateException: Fold has been already finished.
   at org.netbeans.core.output2.NbIO$IOFoldingImpl$NbIoFoldHandleDefinition.finish(NbIO.java:594)
   at org.openide.windows.FoldHandle.finish(FoldHandle.java:69)
   at org.netbeans.modules.maven.execute.cmd.ExecutionEventObject$Tree.finishFold(ExecutionEventObject.java:223)
   at org.netbeans.modules.maven.execute.CommandLineOutputHandler.processExecEvent(CommandLineOutputHandler.java:437)
   at org.netbeans.modules.maven.execute.CommandLineOutputHandler.trimTree(CommandLineOutputHandler.java:525)
   at org.netbeans.modules.maven.execute.CommandLineOutputHandler.completeTreeAtEnd(CommandLineOutputHandler.java:398)
   at org.netbeans.modules.maven.execute.CommandLineOutputHandler.access$1300(CommandLineOutputHandler.java:90)
   at org.netbeans.modules.maven.execute.CommandLineOutputHandler$Output.run(CommandLineOutputHandler.java:345)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1432)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2042)
Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to: java.lang.IllegalStateException: Fold has been already finished.
   at org.openide.util.RequestProcessor.post(RequestProcessor.java:424)
   at org.netbeans.modules.maven.execute.CommandLineOutputHandler.setStdOut(CommandLineOutputHandler.java:168)
   at org.netbeans.modules.maven.execute.MavenCommandLineExecutor.run(MavenCommandLineExecutor.java:212)
   at org.netbeans.core.execution.RunClassThread.run(RunClassThread.java:153)