RFR: 8273401: Disable JarIndex support in URLClassPath

[Daniel Fuchs]

On Wed, 15 Sep 2021 09:33:10 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.

src/java.base/share/classes/jdk/internal/loader/URLClassPath.java line 115:

> 113: 
> 114:         p = props.getProperty("jdk.net.URLClassPath.enableJarIndex");
> 115:         ENABLE_JAR_INDEX = p != null ? p.equals("true") : false;

Maybe this should use the same pattern than the other property above:


ENABLE_JAR_INDEX = p != null ? p.equals("true") || p.isEmpty() : false;

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