src/java.base/share/classes/java/lang/NoClassDefFoundError.java

@@ -38,10 +38,11 @@
  * @author  unascribed
  * @since   1.0
  */
 public
 class NoClassDefFoundError extends LinkageError {
+    @java.io.Serial
     private static final long serialVersionUID = 9095859863287012458L;
 
     /**
      * Constructs a <code>NoClassDefFoundError</code> with no detail message.
      */