src/java.base/share/classes/com/sun/java/util/jar/pack/Attribute.java

*** 714,723 ****
--- 714,724 ----
          }
      }
  
      public static
      class FormatException extends IOException {
+         @java.io.Serial
          private static final long serialVersionUID = -2542243830788066513L;
  
          private int ctype;
          private String name;
          String layout;