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

@@ -661,12 +661,11 @@
     public void setGlassPane(Component glass) {
         if (glass == null) {
             throw new NullPointerException("glassPane cannot be set to null.");
         }
 
-        AWTAccessor.getComponentAccessor().setMixingCutoutShape(glass,
-                new Rectangle());
+        glass.setMixingCutoutShape(new Rectangle());
 
         boolean visible = false;
         if (glassPane != null && glassPane.getParent() == this) {
             this.remove(glassPane);
             visible = glassPane.isVisible();