--- old/src/java.base/share/classes/com/sun/java/util/jar/pack/Attribute.java	2019-08-27 17:26:45.394324386 -0700
+++ new/src/java.base/share/classes/com/sun/java/util/jar/pack/Attribute.java	2019-08-27 17:26:45.198324386 -0700
@@ -716,6 +716,7 @@
 
     public static
     class FormatException extends IOException {
+        @java.io.Serial
         private static final long serialVersionUID = -2542243830788066513L;
 
         private int ctype;