RFR - 8132734: java.util.jar.* changes to support multi-release jar files

[Steve Drach]

Hi Alan,

Thanks for looking at this.

>> Please review the new webrev that addresses the issues raised by Sherman and Alan in the last iteration.  In particular:
>> - fixed the race condition in isMultiRelease() and another one with the variables ‘version’ and ‘configured’
>> - changed the fragment for JarURLConnection runtime versioning from ‘rtversioned’ to ‘runtime’, and created documentation for it
>> - used try with resources to open JarFile in all the tests
>> 
>> Issue:  <https://bugs.openjdk.java.net/browse/JDK-8132734>https://bugs.openjdk.java.net/browse/JDK-8132734 <https://bugs.openjdk.java.net/browse/JDK-8132734> 
>> JEP 238: https://bugs.openjdk.java.net/browse/JDK-8047305 <https://bugs.openjdk.java.net/browse/JDK-8047305> 
>> Webrev: http://cr.openjdk.java.net/~psandoz/multiversion-jar/jar-webrev/ <http://cr.openjdk.java.net/%7Epsandoz/multiversion-jar/jar-webrev/> 
>> 
> The updated webrev looks must better. In JarURLConnection then it would be good if the reference to multi-release JARs should link to the description in the JarFile spec.

Sure, just put a “see JarFile” comment in?

> 
> In the previous round then we were discussing renaming the jdk.util.jar.multirelease property. Has there been any more on that?

Less of a discussion than a suggestion ;-)  I didn’t change it because I wanted to see how important it was — I figured if you didn’t comment it was okay.  But you did comment, so I guess it’s important.  I’ll change it.

> 
> The test MultiReleaseJarURLConnection uses @library /lib/testlibrary/java/util/jar so it's reaching across the file system to use the infrastructure of the JarFile tests. It might be clearer to move the test to the JarFile directory.

I can do that.  I didn’t think that was the right directory to put it in.  Seems like it should be with the other JarURLConnection tests, that way I could just run jtreg on the directory and get all the JarURLConnection tests run, including the multi-release jar test.

> 
> It would be nice if we could reduce some of the really long lines if possible, just to make future side-by-side a bit easier (avoid horizontal scrolling).

I’ll try.

> 
> -Alan.