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

@@ -33,10 +33,11 @@
  * @author  unascribed
  * @since   1.1
  */
 public class NotSerializableException extends ObjectStreamException {
 
+    @java.io.Serial
     private static final long serialVersionUID = 2906642554793891381L;
 
     /**
      * Constructs a NotSerializableException object with message string.
      *