RFR: 8273401: Disable JarIndex support in URLClassPath

[Alan Bateman]

On Wed, 15 Sep 2021 12:09:31 GMT, Alan Bateman <alanb at openjdk.org> wrote:

>> Another question is where to document this property. We will obviously need a CSR and releases notes. I also wonder if it should be promoted into a networking property - which would make it possible to document it in the `net.properties` file. @AlanBateman what do you think?
>
>> Another question is where to document this property. We will obviously need a CSR and releases notes. I also wonder if it should be promoted into a networking property - which would make it possible to document it in the `net.properties` file. @AlanBateman what do you think?
> 
> jdk.net.URLClassLoader.enableJarIndex is meant to be a temporary property. We could document it in URLClassLoader as an implNote but I'm not sure that it's worth it. I re-worded the CSR to reflect the current proposal and Wang has submitted it.  I noted in the CSR that a release note is planned.

> 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.

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