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

@@ -714,10 +714,11 @@
         }
     }
 
     public static
     class FormatException extends IOException {
+        @java.io.Serial
         private static final long serialVersionUID = -2542243830788066513L;
 
         private int ctype;
         private String name;
         String layout;