--- old/src/java.base/share/classes/java/io/FilePermission.java	2019-08-27 17:26:49.070324386 -0700
+++ new/src/java.base/share/classes/java/io/FilePermission.java	2019-08-27 17:26:48.874324386 -0700
@@ -195,6 +195,7 @@
 //        return sb.toString();
 //    }
 
+    @java.io.Serial
     private static final long serialVersionUID = 7930732926638008763L;
 
     /**
@@ -1040,6 +1041,7 @@
      * 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
     {
@@ -1054,6 +1056,7 @@
      * readObject is called to restore the state of the FilePermission from
      * a stream.
      */
+    @java.io.Serial
     private void readObject(ObjectInputStream s)
          throws IOException, ClassNotFoundException
     {
@@ -1210,6 +1213,7 @@
         return perms.elements();
     }
 
+    @java.io.Serial
     private static final long serialVersionUID = 2202956749081564585L;
 
     // Need to maintain serialization interoperability with earlier releases,
@@ -1220,6 +1224,7 @@
      * @serialField permissions java.util.Vector
      *     A list of FilePermission objects.
      */
+    @java.io.Serial
     private static final ObjectStreamField[] serialPersistentFields = {
         new ObjectStreamField("permissions", Vector.class),
     };
@@ -1231,6 +1236,7 @@
      * 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()
 
@@ -1245,6 +1251,7 @@
     /*
      * Reads in a Vector of FilePermissions and saves them in the perms field.
      */
+    @java.io.Serial
     private void readObject(ObjectInputStream in)
         throws IOException, ClassNotFoundException
     {