--- a/src/java.base/share/classes/java/util/IllformedLocaleException.java	Thu Oct 17 20:27:44 2019 +0100
+++ b/src/java.base/share/classes/java/util/IllformedLocaleException.java	Thu Oct 17 20:53:35 2019 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2010, 2019, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -41,12 +41,13 @@
  */
 public class IllformedLocaleException extends RuntimeException {
 
+    @java.io.Serial
     private static final long serialVersionUID = -5245986824925681401L;
 
     private int _errIdx = -1;
 
     /**
-     * Constructs a new <code>IllformedLocaleException</code> with no
+     * Constructs a new {@code IllformedLocaleException} with no
      * detail message and -1 as the error index.
      */
     public IllformedLocaleException() {
@@ -54,7 +55,7 @@
     }
 
     /**
-     * Constructs a new <code>IllformedLocaleException</code> with the
+     * Constructs a new {@code IllformedLocaleException} with the
      * given message and -1 as the error index.
      *
      * @param message the message
@@ -64,7 +65,7 @@
     }
 
     /**
-     * Constructs a new <code>IllformedLocaleException</code> with the
+     * Constructs a new {@code IllformedLocaleException} with the
      * given message and the error index.  The error index is the approximate
      * offset from the start of the ill-formed value to the point where the
      * parse first detected an error.  A negative error index value indicates