RFR: 8176709: JarFileSystem::isMultiReleaseJar is incorrect

[Mandy Chung]

> On Mar 15, 2017, at 11:25 AM, Claes Redestad <claes.redestad at oracle.com> wrote:
> 
> 
> 
> On 03/15/2017 05:36 PM, Mandy Chung wrote:
>> I would prefer to separate the performance issue from this fix and keep this fix simple.  There may be more to tease out for performance regression that I defer to Sherman to discuss with you.
> 
> Ok:
> 
> http://cr.openjdk.java.net/~redestad/8176709/jdk.03/
> 
> Also fixed an additional correctness issue, as we discussed offline, in that we should only catch and swallow NoSuchFileException (when manifest is missing), and rethrow any other IOException.

Looks good.  You can take out the unused import before the push.  Thanks for separating the performance fix from this patch.

Mandy