src/share/classes/javax/swing/plaf/basic/BasicListUI.java

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@@ -2832,10 +2832,11 @@
         return index < list.getModel().getSize() ? index : -1;
     }
 
     private static final TransferHandler defaultTransferHandler = new ListTransferHandler();
 
+    @SuppressWarnings("serial") // Superclass is a JDK-implementation class
     static class ListTransferHandler extends TransferHandler implements UIResource {
 
         /**
          * Create a Transferable to use as the source for a data transfer.
          *