src/java.base/share/classes/sun/util/locale/LocaleSyntaxException.java

*** 31,40 ****
--- 31,41 ----
   */
  package sun.util.locale;
  
  public class LocaleSyntaxException extends Exception {
  
+     @java.io.Serial
      private static final long serialVersionUID = 1L;
  
      private int index = -1;
  
      public LocaleSyntaxException(String msg) {