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

@@ -31,10 +31,11 @@
  * @since   1.1
  */
 public class UnsupportedEncodingException
     extends IOException
 {
+    @java.io.Serial
     private static final long serialVersionUID = -4274276298326136670L;
 
     /**
      * Constructs an UnsupportedEncodingException without a detail message.
      */