src/share/classes/java/awt/dnd/InvalidDnDOperationException.java

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@@ -34,10 +34,12 @@
  * @since 1.2
  */
 
 public class InvalidDnDOperationException extends IllegalStateException {
 
+    private static final long serialVersionUID = 5156676500247816278L;
+
     static private String dft_msg = "The operation requested cannot be performed by the DnD system since it is not in the appropriate state";
 
     /**
      * Create a default Exception
      */