RFR JDK-8066709 Make some JDK system properties read only

[Sundararajan Athijegannathan]

Looks good

-Sundar

On 04/06/18, 7:02 PM, Roger Riggs wrote:
> Please review a change to make the values of java.home, user.home, 
> user.dir, and user.name
> effectively read-only for internal use.  The values are cached during 
> initialization and the
> cached values are used.
>
> Webrev:
>   http://cr.openjdk.java.net/~rriggs/webrev-static-property-8066709/
>
> Issue:
>   https://bugs.openjdk.java.net/browse/JDK-8066709
>
> CSR:
>   https://bugs.openjdk.java.net/browse/JDK-8204235
>
> Thanks, Roger
>
>