src/java.base/share/classes/java/io/CharConversionException.java

@@ -31,10 +31,11 @@
  * @since       1.1
  */
 public class CharConversionException
     extends java.io.IOException
 {
+    @java.io.Serial
     private static final long serialVersionUID = -8680016352018427031L;
 
     /**
      * This provides no detailed message.
      */