RFR: Here are some URLClassPath patches

[Joseph D. Darcy]

Hi Martin,

Until we figure out the best course of action, please problem list the 
failing test.

Thanks,

-Joe

On 2/27/2018 7:02 PM, Martin Buchholz wrote:
> I should probably do more testing than usual when touching classloading...
>
> We have a jdi test that does this (hg blame finds duke as only author):
>
>      public static ClassLoader classLoaderValue;
>      {
>          try {
>              urls[0] = new URL("hi there");
>          } catch (java.net.MalformedURLException ee) {
>          }
>          classLoaderValue = new URLClassLoader(urls);
>      }
>
> The assignment to urls[0] never succeeds (!), so URLClassLoader(URL[]) is
> called with an array holding a null.  Which should cause a NPE, but did not
> prior to JDK-8198484 <https://bugs.openjdk.java.net/browse/JDK-8198484>.
> ArrayDeque does not permit null elements!
>
> Should we accept the NPE as a bug fix and file a retroactive CSR for that,
> or should we continue to compatibly tolerate null URLs (yuk)?
>
> Can we get jdi team to fix their dodgy tests?