src/share/classes/java/awt/Window.java

*** 224,233 ****
--- 224,234 ----
      private transient Component temporaryLostComponent;
  
      static boolean systemSyncLWRequests = false;
      boolean     syncLWRequests = false;
      transient boolean beforeFirstShow = true;
+     private transient boolean disposing = false;
      
      static final int OPENED = 0x01;
  
      /**
       * An Integer value representing the Window State.
*** 1160,1169 ****
--- 1161,1172 ----
      }
  
      void doDispose() {
      class DisposeAction implements Runnable {
          public void run() {
+             disposing = true;
+             try {
                  // Check if this window is the fullscreen window for the
                  // device. Exit the fullscreen mode prior to disposing
                  // of the window if that's the case.
                  GraphicsDevice gd = getGraphicsConfiguration().getDevice();
                  if (gd.getFullScreenWindow() == Window.this) {
*** 1190,1199 ****
--- 1193,1205 ----
                          inputContext.dispose();
                          inputContext = null;
                      }
                  }
                  clearCurrentFocusCycleRootOnHide();
+             } finally {
+                 disposing = false;
+             }
          }
      }
          DisposeAction action = new DisposeAction();
          if (EventQueue.isDispatchThread()) {
              action.run();
*** 2732,2741 ****
--- 2738,2751 ----
      */
      public boolean isShowing() {
          return visible;
      }
  
+     boolean isDisposing() {
+         return disposing;
+     }
+ 
      /**
       * @deprecated As of J2SE 1.4, replaced by
       * {@link Component#applyComponentOrientation Component.applyComponentOrientation}.
       */
      @Deprecated