src/share/classes/sun/swing/JLightweightFrame.java

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@@ -235,10 +235,11 @@
             @Override
             protected boolean isPaintingOrigin() {
                 return true;
             }
         };
+        contentPane.setOpaque(false);
         contentPane.setLayout(new BorderLayout());
         contentPane.add(component);
         setContentPane(contentPane);
 
         contentPane.addContainerListener(new ContainerListener() {