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

*** 49,58 ****
--- 49,59 ----
   * @author  unascribed
   * @since   1.0
   */
  public
  class NullPointerException extends RuntimeException {
+     @java.io.Serial
      private static final long serialVersionUID = 5162710183389028792L;
  
      /**
       * Constructs a {@code NullPointerException} with no detail message.
       */