src/java.base/share/classes/java/text/AttributedCharacterIterator.java

@@ -151,10 +151,11 @@
          *
          * @return the resolved {@code Attribute} object
          * @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");
             }
 

@@ -192,10 +193,11 @@
          * @see Annotation
          */
         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;
 
     };
 
     /**