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

@@ -33,10 +33,11 @@
  */
 
 public class ReadOnlyFileSystemException
     extends UnsupportedOperationException
 {
+    @java.io.Serial
     static final long serialVersionUID = -6822409595617487197L;
 
     /**
      * Constructs an instance of this class.
      */