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

*** 661,672 ****
      public void setGlassPane(Component glass) {
          if (glass == null) {
              throw new NullPointerException("glassPane cannot be set to null.");
          }
  
!         AWTAccessor.getComponentAccessor().setMixingCutoutShape(glass,
!                 new Rectangle());
  
          boolean visible = false;
          if (glassPane != null && glassPane.getParent() == this) {
              this.remove(glassPane);
              visible = glassPane.isVisible();
--- 661,671 ----
      public void setGlassPane(Component glass) {
          if (glass == null) {
              throw new NullPointerException("glassPane cannot be set to null.");
          }
  
!         glass.setMixingCutoutShape(new Rectangle());
  
          boolean visible = false;
          if (glassPane != null && glassPane.getParent() == this) {
              this.remove(glassPane);
              visible = glassPane.isVisible();