RFR JDK-8193802: NullPointerException from JarFileSystem.getVersionMap()

[mandy chung]

Looks fine to me.

Mandy

On 1/31/18 11:54 AM, Xueming Shen wrote:
> Hi
>
> Please help review the change for JDK-8193802.
>
> Issue: https://bugs.openjdk.java.net/browse/JDK-8193802
> Webrev: http://cr.openjdk.java.net/~sherman/8193802/webrev
>
> To add a "null" check when building mr lookup tables. The use scenario 
> here is
> that the jar file and the jarfs env are configured to a mr jarfs, but 
> the jar file itself
> actually does not have the corresponding directory "meta-inf/versions".
>
> Thanks,
> Sherman