--- a/src/java.base/share/classes/java/net/NetPermission.java	Thu Oct 17 20:27:44 2019 +0100
+++ b/src/java.base/share/classes/java/net/NetPermission.java	Thu Oct 17 20:53:35 2019 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -145,6 +145,15 @@
  *   </tr>
  *
  * <tr>
+ *   <th scope="row">setSocketImpl</th>
+ *   <td>The ability to create a sub-class of Socket or ServerSocket with a
+ *   user specified SocketImpl.</td>
+ *   <td>Malicious user-defined SocketImpls can change the behavior of
+ *   Socket and ServerSocket in surprising ways, by virtue of their
+ *   ability to access the protected fields of SocketImpl.</td>
+ *   </tr>
+ *
+ * <tr>
  *   <th scope="row">specifyStreamHandler</th>
  *   <td>The ability
  *   to specify a stream handler when constructing a URL</td>
@@ -175,6 +184,7 @@
  */
 
 public final class NetPermission extends BasicPermission {
+    @java.io.Serial
     private static final long serialVersionUID = -8343910153355041693L;
 
     /**