src/java.base/share/classes/java/nio/file/ClosedWatchServiceException.java

@@ -33,10 +33,11 @@
  */
 
 public class ClosedWatchServiceException
     extends IllegalStateException
 {
+    @java.io.Serial
     static final long serialVersionUID = 1853336266231677732L;
 
     /**
      * Constructs an instance of this class.
      */