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

@@ -284,12 +284,11 @@
         if (oldGlassPane != null) {
             isGlassPaneVisible = oldGlassPane.isVisible();
             super.remove(oldGlassPane);
         }
         if (glassPane != null) {
-            AWTAccessor.getComponentAccessor().setMixingCutoutShape(glassPane,
-                    new Rectangle());
+            glassPane.setMixingCutoutShape(new Rectangle());
             glassPane.setVisible(isGlassPaneVisible);
             super.addImpl(glassPane, null, 0);
         }
         this.glassPane = glassPane;
         firePropertyChange("glassPane", oldGlassPane, glassPane);