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

*** 32,41 ****
--- 32,42 ----
   *
   * @since   1.2
   */
  public
  class UnsupportedClassVersionError extends ClassFormatError {
+     @java.io.Serial
      private static final long serialVersionUID = -7123279212883497373L;
  
      /**
       * Constructs a <code>UnsupportedClassVersionError</code>
       * with no detail message.