--- a/src/java.base/share/classes/sun/security/rsa/RSAPrivateCrtKeyImpl.java	Thu Oct 17 20:27:44 2019 +0100
+++ b/src/java.base/share/classes/sun/security/rsa/RSAPrivateCrtKeyImpl.java	Thu Oct 17 20:53:35 2019 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2003, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2003, 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
@@ -55,6 +55,7 @@
 public final class RSAPrivateCrtKeyImpl
         extends PKCS8Key implements RSAPrivateCrtKey {
 
+    @java.io.Serial
     private static final long serialVersionUID = -1326088454257084918L;
 
     private BigInteger n;       // modulus
@@ -69,6 +70,7 @@
     // Optional parameters associated with this RSA key
     // specified in the encoding of its AlgorithmId.
     // Must be null for "RSA" keys.
+    @SuppressWarnings("serial") // Not statically typed as Serializable
     private AlgorithmParameterSpec keyParams;
 
     /**