RFR: 8151542: URL resources for multi-release jar files have a #runtime fragment appended to them

[Steve Drach]

>>> Issue: https://bugs.openjdk.java.net/browse/JDK-8151542 <https://bugs.openjdk.java.net/browse/JDK-8151542>
>>> 
>>> Webrev: http://cr.openjdk.java.net/~sdrach/8151542/webrev/ <http://cr.openjdk.java.net/~sdrach/8151542/webrev/>
>>> 
>>> This changeset causes the URL returned from a ClassLoader.getResource(name) invocation to be reified, that is the URL is a direct pointer to either a versioned or unversioned entry in the jar file. The patch also assures that jar URL’s are always processed by the URLClassPath.JarLoader.  The MultiReleaseJarURLConnection test was enhanced to demonstrate that reified URLs are returned.  The SimpleHttpServer test helper class was moved into it’s own file.
>> I was happy to see John's note on diction so I assume the method will be renamed. Have you considered making it public so that tools and libraries outside of the JDK can use this?
> 
> It sounds reasonable for this to be a public API,

I opened JDK-8155657 to track that.

> and if so, does it make sense to
> move it to JarEntry ( rather than JarFile )? So it would be JarEntry::getTrueName,
> or similar.

The part of JarFile that knows all about versioning is a subclass of JarEntry, JarFileEntry.  JarEntry knows nothing about  versioning, nor about JarFileEntry.  Only JarFile knows about JarFileEntry.