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Multiple AssertionError happened when a renaming a JavaFX Project including its project-folder (from /home/dave/NetBeansProjects/MediaPlayer to /home/dave/NetBeansProjects/MediaView). Very likely it is one AssertionError per a file/folder in the project. java.lang.AssertionError: childName: /home/dave/NetBeansProjects/MediaView/src/org/netbeans folderName: /home/dave/NetBeansProjects/MediaView/src/org at org.netbeans.modules.masterfs.filebasedfs.children.ChildrenSupport.addChild(ChildrenSupport.java:125) at org.netbeans.modules.masterfs.filebasedfs.children.ChildrenSupport.rescanChild(ChildrenSupport.java:183) at org.netbeans.modules.masterfs.filebasedfs.children.ChildrenSupport.getChild(ChildrenSupport.java:99) at org.netbeans.modules.masterfs.filebasedfs.fileobjects.FolderObj$FolderChildrenCache.getChild(FolderObj.java:556) at org.netbeans.modules.masterfs.filebasedfs.fileobjects.FileObjectFactory.getFileObject(FileObjectFactory.java:181) at org.netbeans.modules.masterfs.filebasedfs.fileobjects.FolderObj.refreshImpl(FolderObj.java:370) at org.netbeans.modules.masterfs.filebasedfs.fileobjects.BaseFileObj.refresh(BaseFileObj.java:677) at org.netbeans.modules.masterfs.filebasedfs.fileobjects.FolderObj.refresh(FolderObj.java:435) at org.netbeans.modules.masterfs.filebasedfs.fileobjects.FileObjectFactory.refresh(FileObjectFactory.java:511) at org.netbeans.modules.masterfs.filebasedfs.fileobjects.FileObjectFactory.refresh(FileObjectFactory.java:484) at org.netbeans.modules.masterfs.filebasedfs.fileobjects.FileObjectFactory.refreshAll(FileObjectFactory.java:431) at org.netbeans.modules.masterfs.filebasedfs.fileobjects.FileObjectFactory$1.run(FileObjectFactory.java:693) at org.netbeans.modules.masterfs.filebasedfs.FileBasedFileSystem.runAsInconsistent(FileBasedFileSystem.java:102) at org.netbeans.modules.masterfs.filebasedfs.fileobjects.FileObjectFactory.refresh(FileObjectFactory.java:700) at org.netbeans.modules.masterfs.filebasedfs.fileobjects.RootObj.invokeRefreshFor(RootObj.java:191) at org.netbeans.modules.masterfs.filebasedfs.fileobjects.RefreshSlow.run(RefreshSlow.java:67) at org.netbeans.modules.masterfs.filebasedfs.utils.FileChangedManager.idleIO(FileChangedManager.java:156) at org.netbeans.modules.masterfs.filebasedfs.fileobjects.RefreshSlow.run(RefreshSlow.java:65) at org.netbeans.core.ui.warmup.MenuWarmUpTask$NbWindowsAdapter.run(MenuWarmUpTask.java:283) at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1415) at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1954) Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to at org.openide.util.RequestProcessor$Task.schedule(RequestProcessor.java:1453) at org.netbeans.core.ui.warmup.MenuWarmUpTask$NbWindowsAdapter.windowActivated(MenuWarmUpTask.java:153) at java.awt.AWTEventMulticaster.windowActivated(AWTEventMulticaster.java:373) at java.awt.AWTEventMulticaster.windowActivated(AWTEventMulticaster.java:372) at java.awt.AWTEventMulticaster.windowActivated(AWTEventMulticaster.java:372) at java.awt.Window.processWindowEvent(Window.java:1874) at javax.swing.JFrame.processWindowEvent(JFrame.java:279) at java.awt.Window.processEvent(Window.java:1820) at java.awt.Component.dispatchEventImpl(Component.java:4630) at java.awt.Container.dispatchEventImpl(Container.java:2099) at java.awt.Window.dispatchEventImpl(Window.java:2475) at java.awt.Component.dispatchEvent(Component.java:4460) at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1848) at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:889) at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:409) at java.awt.Component.dispatchEventImpl(Component.java:4502) at java.awt.Container.dispatchEventImpl(Container.java:2099) at java.awt.Window.dispatchEventImpl(Window.java:2475) at java.awt.Component.dispatchEvent(Component.java:4460) at java.awt.EventQueue.dispatchEvent(EventQueue.java:599) at com.sun.embeddedswing.EmbeddedEventQueue.dispatchEvent(EmbeddedEventQueue.java:448) at java.awt.SentEvent.dispatch(SentEvent.java:55) at java.awt.DefaultKeyboardFocusManager$DefaultKeyboardFocusManagerSentEvent.dispatch(DefaultKeyboardFocusManager.java:183) at java.awt.DefaultKeyboardFocusManager.sendMessage(DefaultKeyboardFocusManager.java:210) at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:286) at java.awt.Component.dispatchEventImpl(Component.java:4502) at java.awt.Container.dispatchEventImpl(Container.java:2099) at java.awt.Window.dispatchEventImpl(Window.java:2475) at java.awt.Component.dispatchEvent(Component.java:4460) at java.awt.EventQueue.dispatchEvent(EventQueue.java:599) at com.sun.embeddedswing.EmbeddedEventQueue.dispatchEvent(EmbeddedEventQueue.java:448) [catch] at java.awt.SequencedEvent.dispatch(SequencedEvent.java:101) at java.awt.EventQueue.dispatchEvent(EventQueue.java:597) at com.sun.embeddedswing.EmbeddedEventQueue.dispatchEvent(EmbeddedEventQueue.java:448) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161) at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
*** This bug has been marked as a duplicate of bug 185346 ***