RFR (XS) : 8057076 : Correct exception message in CertAndKeyGen.java

[Seán Coffey]

https://bugs.openjdk.java.net/browse/JDK-8057076

As per earlier discussion today, a simple update to the exception 
message used in JDK 9.

diff --git 
a/src/java.base/share/classes/sun/security/tools/keytool/CertAndKeyGen.java 
b/src/java.base/share/classes/sun/security/tools/keytool/CertAndKeyGen.java
--- 
a/src/java.base/share/classes/sun/security/tools/keytool/CertAndKeyGen.java
+++ 
b/src/java.base/share/classes/sun/security/tools/keytool/CertAndKeyGen.java
@@ -1,5 +1,5 @@
  /*
- * Copyright (c) 1996, 2012, Oracle and/or its affiliates. All rights 
reserved.
+ * Copyright (c) 1996, 2014, 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
@@ -158,8 +158,8 @@
          // publicKey's format must be X.509 otherwise
          // the whole CertGen part of this class is broken.
          if (!"X.509".equalsIgnoreCase(publicKey.getFormat())) {
-            throw new IllegalArgumentException("publicKey's is not 
X.509, but "
-                    + publicKey.getFormat());
+            throw new IllegalArgumentException("Public key format is "
+                + publicKey.getFormat() + ", must be X.509");
          }
      }

regards,
Sean.