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

@@ -193,10 +193,11 @@
 //        }
 //        sb.append("***\n");
 //        return sb.toString();
 //    }
 
+    @java.io.Serial
     private static final long serialVersionUID = 7930732926638008763L;
 
     /**
      * Use the platform's default file system to avoid recursive initialization
      * issues when the VM is configured to use a custom file system provider.

@@ -1038,10 +1039,11 @@
     /**
      * WriteObject is called to save the state of the FilePermission
      * to a stream. The actions are serialized, and the superclass
      * takes care of the name.
      */
+    @java.io.Serial
     private void writeObject(ObjectOutputStream s)
         throws IOException
     {
         // Write out the actions. The superclass takes care of the name
         // call getActions to make sure actions field is initialized

@@ -1052,10 +1054,11 @@
 
     /**
      * readObject is called to restore the state of the FilePermission from
      * a stream.
      */
+    @java.io.Serial
     private void readObject(ObjectInputStream s)
          throws IOException, ClassNotFoundException
     {
         // Read in the actions, then restore everything else by calling init.
         s.defaultReadObject();

@@ -1208,20 +1211,22 @@
     @Override
     public Enumeration<Permission> elements() {
         return perms.elements();
     }
 
+    @java.io.Serial
     private static final long serialVersionUID = 2202956749081564585L;
 
     // Need to maintain serialization interoperability with earlier releases,
     // which had the serializable field:
     //    private Vector permissions;
 
     /**
      * @serialField permissions java.util.Vector
      *     A list of FilePermission objects.
      */
+    @java.io.Serial
     private static final ObjectStreamField[] serialPersistentFields = {
         new ObjectStreamField("permissions", Vector.class),
     };
 
     /**

@@ -1229,10 +1234,11 @@
      */
     /*
      * Writes the contents of the perms field out as a Vector for
      * serialization compatibility with earlier releases.
      */
+    @java.io.Serial
     private void writeObject(ObjectOutputStream out) throws IOException {
         // Don't call out.defaultWriteObject()
 
         // Write out Vector
         Vector<Permission> permissions = new Vector<>(perms.values());

@@ -1243,10 +1249,11 @@
     }
 
     /*
      * Reads in a Vector of FilePermissions and saves them in the perms field.
      */
+    @java.io.Serial
     private void readObject(ObjectInputStream in)
         throws IOException, ClassNotFoundException
     {
         // Don't call defaultReadObject()