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

@@ -33,10 +33,11 @@
  * @author  unascribed
  * @since   1.0
  */
 public
 class ClassFormatError extends LinkageError {
+    @java.io.Serial
     private static final long serialVersionUID = -8420114879011949195L;
 
     /**
      * Constructs a <code>ClassFormatError</code> with no detail message.
      */