title: Eclipse: Could not open the editor: No editor descriptor for id org.eclipse.jdt.ui.CompilationUnitEditor
body: <p>When I updated Eclipse using "Help -> Check for Updates" I got a problem. </p>
  
  <p>If I try to start Eclipse, Eclipse opens but show a error message like this:</p>
  
  <pre><code>  Could not open the editor: No editor descriptor 
    for id org.eclipse.jdt.ui.CompilationUnitEditor
  </code></pre>
  
  <p>And inside "Details" of the error, I have the following description:</p>
  
  <pre><code>    org.eclipse.ui.PartInitException: No editor descriptor for id org.eclipse.jdt.ui.CompilationUnitEditor
      at org.eclipse.ui.internal.EditorReference.createPartHelper(EditorReference.java:601)
      at org.eclipse.ui.internal.EditorReference.createPart(EditorReference.java:465)
      at org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReference.java:595)
      at org.eclipse.ui.internal.PartPane.setVisible(PartPane.java:313)
      at org.eclipse.ui.internal.presentations.PresentablePart.setVisible(PresentablePart.java:180)
      at org.eclipse.ui.internal.presentations.util.PresentablePartFolder.select(PresentablePartFolder.java:270)
      at org.eclipse.ui.internal.presentations.util.LeftToRightTabOrder.select(LeftToRightTabOrder.java:65)
      at org.eclipse.ui.internal.presentations.util.TabbedStackPresentation.selectPart(TabbedStackPresentation.java:473)
      at org.eclipse.ui.internal.PartStack.refreshPresentationSelection(PartStack.java:1245)
      at org.eclipse.ui.internal.PartStack.handleDeferredEvents(PartStack.java:1213)
      at org.eclipse.ui.internal.LayoutPart.deferUpdates(LayoutPart.java:400)
      at org.eclipse.ui.internal.PartSashContainer.handleDeferredEvents(PartSashContainer.java:1409)
      at org.eclipse.ui.internal.LayoutPart.deferUpdates(LayoutPart.java:400)
      at org.eclipse.ui.internal.WorkbenchPage.handleDeferredEvents(WorkbenchPage.java:1495)
      at org.eclipse.ui.internal.WorkbenchPage.deferUpdates(WorkbenchPage.java:1485)
      at org.eclipse.ui.internal.WorkbenchPage.closeEditors(WorkbenchPage.java:1459)
      at org.eclipse.ui.internal.WorkbenchPage.closeEditor(WorkbenchPage.java:1514)
      at org.eclipse.ui.internal.EditorPane.doHide(EditorPane.java:61)
      at org.eclipse.ui.internal.PartStack.close(PartStack.java:537)
      at org.eclipse.ui.internal.EditorStack.close(EditorStack.java:206)
      at org.eclipse.ui.internal.PartStack$1.close(PartStack.java:120)
      at org.eclipse.ui.internal.presentations.util.TabbedStackPresentation$1.handleEvent(TabbedStackPresentation.java:83)
      at org.eclipse.ui.internal.presentations.util.AbstractTabFolder.fireEvent(AbstractTabFolder.java:269)
      at org.eclipse.ui.internal.presentations.util.AbstractTabFolder.fireEvent(AbstractTabFolder.java:278)
      at org.eclipse.ui.internal.presentations.defaultpresentation.DefaultTabFolder.access$1(DefaultTabFolder.java:1)
      at org.eclipse.ui.internal.presentations.defaultpresentation.DefaultTabFolder$1.closeButtonPressed(DefaultTabFolder.java:71)
      at org.eclipse.ui.internal.presentations.PaneFolder.notifyCloseListeners(PaneFolder.java:631)
      at org.eclipse.ui.internal.presentations.PaneFolder$3.close(PaneFolder.java:206)
      at org.eclipse.swt.custom.CTabFolder.onMouse(CTabFolder.java:1598)
      at org.eclipse.swt.custom.CTabFolder$1.handleEvent(CTabFolder.java:261)
      at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
      at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1258)
      at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3588)
      at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3209)
      at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2696)
      at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2660)
      at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2494)
      at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:674)
      at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
      at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:667)
      at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
      at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:123)
      at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
      at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
      at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
      at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:344)
      at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
      at java.lang.reflect.Method.invoke(Method.java:601)
      at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:622)
      at org.eclipse.equinox.launcher.Main.basicRun(Main.java:577)
      at org.eclipse.equinox.launcher.Main.run(Main.java:1410)
      at org.eclipse.equinox.launcher.Main.main(Main.java:1386)
  </code></pre>
  
  <p>What can I do to solve this problem? I don't do anything, I just update Eclipse from their own "Check for Updates". </p>