jdk/src/java.desktop/share/classes/javax/swing/JLayer.java

*** 284,295 ****
          if (oldGlassPane != null) {
              isGlassPaneVisible = oldGlassPane.isVisible();
              super.remove(oldGlassPane);
          }
          if (glassPane != null) {
!             AWTAccessor.getComponentAccessor().setMixingCutoutShape(glassPane,
!                     new Rectangle());
              glassPane.setVisible(isGlassPaneVisible);
              super.addImpl(glassPane, null, 0);
          }
          this.glassPane = glassPane;
          firePropertyChange("glassPane", oldGlassPane, glassPane);
--- 284,294 ----
          if (oldGlassPane != null) {
              isGlassPaneVisible = oldGlassPane.isVisible();
              super.remove(oldGlassPane);
          }
          if (glassPane != null) {
!             glassPane.setMixingCutoutShape(new Rectangle());
              glassPane.setVisible(isGlassPaneVisible);
              super.addImpl(glassPane, null, 0);
          }
          this.glassPane = glassPane;
          firePropertyChange("glassPane", oldGlassPane, glassPane);