org.openide.filesystems.FileAlreadyLockedException: E:\admin\Documents\NetBeansProjects\oj\nbactions.xml
   at org.netbeans.modules.masterfs.filebasedfs.fileobjects.LockForFile.registerLock(LockForFile.java:115)
   at org.netbeans.modules.masterfs.filebasedfs.fileobjects.LockForFile.tryLock(LockForFile.java:104)
   at org.netbeans.modules.masterfs.filebasedfs.fileobjects.FileObj.lock(FileObj.java:409)
   at org.netbeans.modules.maven.customizer.CustomizerProviderImpl$2.run(CustomizerProviderImpl.java:439)
   at org.openide.filesystems.EventControl.runAtomicAction(EventControl.java:127)
   at org.openide.filesystems.FileSystem.runAtomicAction(FileSystem.java:519)
   at org.netbeans.modules.maven.customizer.CustomizerProviderImpl.writeNbActionsModel(CustomizerProviderImpl.java:410)
   at org.netbeans.modules.maven.customizer.CustomizerProviderImpl.writeNbActionsModel(CustomizerProviderImpl.java:402)
   at org.netbeans.modules.maven.customizer.CustomizerProviderImpl.writeAll(CustomizerProviderImpl.java:375)
   at org.netbeans.modules.maven.customizer.CustomizerProviderImpl$OptionListener.actionPerformed(CustomizerProviderImpl.java:329)
   at org.netbeans.modules.project.uiapi.CustomizerDialog$OptionListener$2$1$1.run(CustomizerDialog.java:314)
   at org.openide.filesystems.FileUtil$2.run(FileUtil.java:439)
   at org.openide.filesystems.EventControl.runAtomicAction(EventControl.java:127)
   at org.openide.filesystems.FileSystem.runAtomicAction(FileSystem.java:519)
   at org.openide.filesystems.FileUtil.runAtomicAction(FileUtil.java:423)
   at org.openide.filesystems.FileUtil.runAtomicAction(FileUtil.java:443)
   at org.netbeans.modules.project.uiapi.CustomizerDialog$OptionListener$2$1.run(CustomizerDialog.java:309)
   at org.netbeans.modules.openide.util.DefaultMutexImplementation.writeAccess(DefaultMutexImplementation.java:293)
   at org.openide.util.Mutex.writeAccess(Mutex.java:271)
   at org.netbeans.modules.project.uiapi.CustomizerDialog$OptionListener$2.run(CustomizerDialog.java:306)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1443)
   at org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:68)
   at org.openide.util.lookup.Lookups.executeWith(Lookups.java:303)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2058)