RFR: 8273401: Disable JarIndex support in URLClassPath

[Lance Andersen]

On Wed, 15 Sep 2021 18:59:08 GMT, Daniel Fuchs <dfuchs at openjdk.org> wrote:

>> I assume the reason for specifically checking for a value of true or an empty string as you envision allowing the property to be explicitly set to false in the future?  
>> 
>> Otherwise we could just check if the property is set(regardless of value) to re-enable the feature.
>
> I would dislike it if `-Djdk.net.URLClassPath.enableJarIndex=false` meant true...

I can appreciate that and that is a fair point.   I guess  where I was coming from was that the property is temporary and has to be explicitly specified so ignoring the value seemed worth raising/discussing.   

 Assuming the current check is kept(which we should based on your input), it should probably be changed to ignore case.

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PR: https://git.openjdk.java.net/jdk/pull/5524