src/share/classes/javax/swing/plaf/metal/MetalLookAndFeel.java

@@ -2336,10 +2336,11 @@
         }
     }
 
     // From the JLF Design Guidelines:
     // http://www.oracle.com/technetwork/java/jlf-135985.html
+    @SuppressWarnings("fallthrough")
     private static class MetalLayoutStyle extends DefaultLayoutStyle {
         private static MetalLayoutStyle INSTANCE = new MetalLayoutStyle();
 
         @Override
         public int getPreferredGap(JComponent component1,