Ugly things done to support multiple ContentHandlerFactory and URLStreamHandlerFactory

[Thomas Watson]

> From: Alan Bateman <Alan.Bateman at oracle.com>
> Have you looked at the changes in this area in JDK 9, specifically the 
> changes on how protocol handlers are located and the new URL stream 
> handler service-provider type URLStreamHandlerProvider?
> 
> -Alan
> 

Thanks for the pointer Alan.  I'll have a look.  Is there any additional 
documentation on this besides the javadoc?  At first glance it is unclear 
to me what discovers the providers?  Is the the URL class itself based on 
the thread context class loader?  How do providers interact with the 
statically set factory.  I also don't see a provider SPI type for 
java.net.ContentHandlerFactory.

Tom