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

@@ -36,10 +36,11 @@
 
 public class UnmappableCharacterException
     extends CharacterCodingException
 {
 
+    @java.io.Serial
     private static final long serialVersionUID = -7026962371537706123L;
 
     private int inputLength;
 
     /**