src/java.base/share/classes/java/nio/charset/UnmappableCharacterException.java

*** 36,45 ****
--- 36,46 ----
  
  public class UnmappableCharacterException
      extends CharacterCodingException
  {
  
+     @java.io.Serial
      private static final long serialVersionUID = -7026962371537706123L;
  
      private int inputLength;
  
      /**