RFR 8198697: Simplify platform encoding initialization tweak

[Roger Riggs]

Please review...

On 2/28/2018 9:45 AM, Roger Riggs wrote:
> Hi,
>
> In an effort to untangle some of the issues with property 
> initialization I was looking
> at the platform encoding initialization and found a simplification.
>
> Currently, the initialization occurs as a side effect of the first 
> call to JNU_NewStringPlatform and
> involves a upcall to get sun.jnu.encoding from the system properties.  
> The value is cached for later use.
>
> The native System.initProperties determines the platform specific 
> encoding via java_props_md.c and does an upcall to set the 
> sun.jnu.encoding system property, taking care to do it before the 
> first string that needs platform encoding.
>
> The change directly initializes the platform encoding fast path before 
> it is needed to encode platform strings.
> And moves the setting sun.jnu.encoding system property after the 
> command line arguments are inserted
> keeping it from being overridden by -D on the command line that can 
> only confuse confusion
> with code that later reads the property.
>
> Please review and comment.
>
> webrev:
>    http://cr.openjdk.java.net/~rriggs/webrev-simplify-jnu-8198697/
>
> Issue:
>    https://bugs.openjdk.java.net/browse/JDK-8198697
>
> Thanks, Roger
>
>
>
>