--- a/src/java.base/share/classes/javax/security/auth/PrivateCredentialPermission.java	Thu Oct 17 20:27:44 2019 +0100
+++ b/src/java.base/share/classes/javax/security/auth/PrivateCredentialPermission.java	Thu Oct 17 20:53:35 2019 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1999, 2015, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1999, 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
@@ -104,6 +104,7 @@
  */
 public final class PrivateCredentialPermission extends Permission {
 
+    @java.io.Serial
     private static final long serialVersionUID = 5284372143517237068L;
 
     private static final CredOwner[] EMPTY_PRINCIPALS = new CredOwner[0];
@@ -118,6 +119,7 @@
      *          The set contains elements of type,
      *          {@code PrivateCredentialPermission.CredOwner}.
      */
+    @SuppressWarnings("serial") // Not statically typed as Serializable
     private Set<Principal> principals;  // ignored - kept around for compatibility
     private transient CredOwner[] credOwners;
 
@@ -474,6 +476,7 @@
     /**
      * Reads this object from a stream (i.e., deserializes it)
      */
+    @java.io.Serial
     private void readObject(java.io.ObjectInputStream s) throws
                                         java.io.IOException,
                                         ClassNotFoundException {
@@ -500,6 +503,7 @@
      */
     static class CredOwner implements java.io.Serializable {
 
+        @java.io.Serial
         private static final long serialVersionUID = -5607449830436408266L;
 
         /**