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 ****
--- 1161,1171 ----
      }
  
      void doDispose() {
      class DisposeAction implements Runnable {
          public void run() {
+             disposing = true;
              // 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 ****
--- 1192,1202 ----
                      inputContext.dispose();
                      inputContext = null;
                  }
              }
              clearCurrentFocusCycleRootOnHide();
+             disposing = false;
          }
      }
          DisposeAction action = new DisposeAction();
          if (EventQueue.isDispatchThread()) {
              action.run();
*** 2732,2741 ****
--- 2735,2748 ----
      */
      public boolean isShowing() {
          return visible;
      }
  
+     boolean isDisposing() {
+         return disposing;
+     }
+ 
      /**
       * @deprecated As of J2SE 1.4, replaced by
       * {@link Component#applyComponentOrientation Component.applyComponentOrientation}.
       */
      @Deprecated