src/java.desktop/unix/classes/sun/awt/X11/XToolkit.java

*** 856,870 ****
       *
       * When two screens overlap and the first contains a dock(*****), then
       * _NET_WORKAREA may start at point x1,y1 and end at point x2,y2.
       */
      @Override
!     public Insets getScreenInsets(GraphicsConfiguration gc)
!     {
!         XNETProtocol netProto = XWM.getWM().getNETProtocol();
!         if ((netProto == null) || !netProto.active())
!         {
              return super.getScreenInsets(gc);
          }
  
          XToolkit.awtLock();
          try
--- 856,869 ----
       *
       * When two screens overlap and the first contains a dock(*****), then
       * _NET_WORKAREA may start at point x1,y1 and end at point x2,y2.
       */
      @Override
!     public Insets getScreenInsets(final GraphicsConfiguration gc) {
!         GraphicsDevice gd = gc.getDevice();
!         XNETProtocol np = XWM.getWM().getNETProtocol();
!         if (np == null || !(gd instanceof X11GraphicsDevice) || !np.active()) {
              return super.getScreenInsets(gc);
          }
  
          XToolkit.awtLock();
          try