RFR: 8273401: Disable JarIndex support in URLClassPath [v2]

[Daniel Fuchs]

On Thu, 16 Sep 2021 01:29:12 GMT, wxiang <github.com+53162078+shiyuexw at openjdk.org> wrote:

>> There is a bug for URLClassPath.findResources with JarIndex.
>> Currently, there was agreement on dropping the support from the URLClassLoader implementation but it was suggested that it should be disabled for a release or two before the code is removed. 
>> A system property can be used to re-enable JarIndex support in URLClassPath.
>> 
>> The PR includes:
>> Disable JarIndex support in URLClassPath by default.
>> Add system property jdk.net.URLClassPath.enableJarIndex to re-enable JarIndex support.
>
> wxiang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   add isEmpty check

Marked as reviewed by dfuchs (Reviewer).

Marked as reviewed by dfuchs (Reviewer).

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