java.lang.NoClassDefFoundError: java/awt/KeyEventPostProcessor

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java.lang.NoClassDefFoundError: java/awt/KeyEventPostProcessor
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:495)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:110)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:249)
at java.net.URLClassLoader.access$100(URLClassLoader.java:57)
at java.net.URLClassLoader$1.run(URLClassLoader.java:196)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:189)
at java.lang.ClassLoader.loadClass(ClassLoader.java:304)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:287)
at java.lang.ClassLoader.loadClass(ClassLoader.java:260)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:130)
at org.netbeans.core.windows.frames.NbFocusManager.install(NbFocusManager.java:58)
at org.netbeans.core.windows.frames.SplitContainerImpl.(SplitContainerImpl.java:116)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:33)
at sun.reflect.InflatableConstructorAccessorImpl.newInstance(InflatableConstructorAccessorImpl.java:38)
at java.lang.reflect.Constructor.newInstance(Constructor.java:273)
at java.lang.Class.newInstance0(Class.java:290)
at java.lang.Class.newInstance(Class.java:249)
at org.netbeans.core.windows.frames.WindowTypesManager.createInstance(WindowTypesManager.java:179)
at org.netbeans.core.windows.frames.WindowTypesManager.createInstance(WindowTypesManager.java:162)
at org.netbeans.core.windows.frames.WindowTypesManager.createContainer(WindowTypesManager.java:64)
at org.netbeans.core.windows.ModeImpl.createContainer(ModeImpl.java:1822)
at org.netbeans.core.windows.ModeImpl.addToContainer(ModeImpl.java:1765)
at org.netbeans.core.windows.ModeImpl.access$400(ModeImpl.java:77)
at org.netbeans.core.windows.ModeImpl$1.performCommand(ModeImpl.java:396)
at org.netbeans.core.windows.DeferredPerformer.processCommand(DeferredPerformer.java:186)
at org.netbeans.core.windows.DeferredPerformer.putRequest(DeferredPerformer.java:83)
at org.netbeans.core.windows.ModeImpl.dockInto(ModeImpl.java:377)
at org.netbeans.core.windows.ModeImpl.dockInto(ModeImpl.java:357)
at org.netbeans.core.windows.ModeImpl.dockInto(ModeImpl.java:345)
at org.netbeans.core.windows.WindowManagerImpl$TopComponentManager.doOpen(WindowManagerImpl.java:1456)
at org.netbeans.core.windows.WindowManagerImpl$TopComponentManager.open(WindowManagerImpl.java:1413)
at org.openide.windows.TopComponent.open(TopComponent.java:212)
at org.openide.explorer.ExplorerPanel.open(ExplorerPanel.java:88)
at org.netbeans.core.NbMainExplorer$ExplorerTab.open(NbMainExplorer.java:536)
at org.netbeans.core.NbMainExplorer$MainTab.open(NbMainExplorer.java:763)
at org.netbeans.core.windows.layers.TCRefImpl.performCommand(TCRefImpl.java:163)
at org.netbeans.core.windows.DeferredPerformer.processCommand(DeferredPerformer.java:186)
at org.netbeans.core.windows.DeferredPerformer.stateChanged(DeferredPerformer.java:155)
at org.netbeans.core.windows.StateManager.fireStateChanged(StateManager.java:117)
at org.netbeans.core.windows.StateManager.setVisibilityState(StateManager.java:142)
at org.netbeans.core.windows.StateManager.propertyChange(StateManager.java:164)
at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:333)
at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:260)
at java.awt.Component.firePropertyChange(Component.java:6476)
at org.netbeans.core.windows.MainWindow.doShowWindow(MainWindow.java:232)
at org.netbeans.core.windows.MainWindow.access$300(MainWindow.java:57)
at org.netbeans.core.windows.MainWindow$4.run(MainWindow.java:207)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:167)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:437)
at java.awt.EventDispatchThread.pumpOneEvent(EventDispatchThread.java:150)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:136)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:131)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:99)

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