RFR: 8273401: Disable JarIndex support in URLClassPath

[Daniel Fuchs]

On Wed, 15 Sep 2021 18:29:44 GMT, Lance Andersen <lancea at openjdk.org> wrote:

>>> Maybe this should use the same pattern than the other property above:
>>> 
>>> ```
>>> ENABLE_JAR_INDEX = p != null ? p.equals("true") || p.isEmpty() : false;
>>> ```
>> 
>> Yes, the intention is that -Djdk.net.URLClassLoader.enableJarIndex will re-enable the feature.
>
> 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...

-------------

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