--- old/src/java.base/share/classes/java/text/AttributedCharacterIterator.java	2019-08-27 17:28:19.466324386 -0700
+++ new/src/java.base/share/classes/java/text/AttributedCharacterIterator.java	2019-08-27 17:28:19.258324386 -0700
@@ -153,6 +153,7 @@
          * @throws InvalidObjectException if the object to resolve is not
          *                                an instance of {@code Attribute}
          */
+        @java.io.Serial
         protected Object readResolve() throws InvalidObjectException {
             if (this.getClass() != Attribute.class) {
                 throw new InvalidObjectException("subclass didn't correctly implement readResolve");
@@ -194,6 +195,7 @@
         public static final Attribute INPUT_METHOD_SEGMENT = new Attribute("input_method_segment");
 
         // make sure the serial version doesn't change between compiler versions
+        @java.io.Serial
         private static final long serialVersionUID = -9142742483513960612L;
 
     };