java.lang.InterruptedException
        at java.lang.Object.wait(Object.java:0)
        at java.lang.Object.wait(Object.java:485)
        at org.openide.util.Mutex$QueueCell.sleep(Mutex.java:1601)
        at org.openide.util.Mutex.enterImpl(Mutex.java:723)
        at org.openide.util.Mutex.enter(Mutex.java:630)
        at org.openide.util.Mutex.readEnter(Mutex.java:613)
        at org.openide.util.Mutex$Privileged.enterReadAccess(Mutex.java:1647)
        at org.netbeans.modules.masterfs.filebasedfs.fileobjects.FileObjectFactory.getFileObject(FileObjectFactory.java:182)
        at org.netbeans.modules.masterfs.filebasedfs.fileobjects.FileObjectFactory.getValidFileObject(FileObjectFactory.java:638)
        at org.netbeans.modules.masterfs.filebasedfs.FileBasedFileSystem.getFileObject(FileBasedFileSystem.java:134)
        at org.netbeans.modules.masterfs.filebasedfs.FileBasedURLMapper.getFileObjects(FileBasedURLMapper.java:134)
        at org.netbeans.modules.masterfs.MasterURLMapper.getFileObjects(MasterURLMapper.java:61)
        at org.openide.filesystems.URLMapper.findFileObject(URLMapper.java:213)
        at org.openide.filesystems.FileUtil.isArchiveFile(FileUtil.java:1703)
        at org.netbeans.modules.java.j2seproject.ui.LibrariesNode$SimpleFileFilter.accept(LibrariesNode.java:814)
        at javax.swing.JFileChooser.accept(JFileChooser.java:1576)
        at javax.swing.plaf.basic.BasicDirectoryModel$LoadFilesThread$1.call(BasicDirectoryModel.java:235)
        at javax.swing.plaf.basic.BasicDirectoryModel$LoadFilesThread$1.call(BasicDirectoryModel.java:221)
        at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
        at java.util.concurrent.FutureTask.run(FutureTask.java:138)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
        at sun.awt.shell.Win32ShellFolderManager2$ComInvoker$3.run(Win32ShellFolderManager2.java:458)
        at java.lang.Thread.run(Thread.java:619)