Review Request: loading JCE providers using ServiceLoader

[Sean Mullan]

I discovered another issue with respect to using a ServiceLoader to load 
JCE providers. In our current JDK implementation, if you try to load a 
Provider using Security.getProvider(String) and the Provider's ctor 
throws a ProviderException, this gets passed through to the caller.

This type of behavior is difficult to preserve when using a 
ServiceLoader. I can catch a ServiceConfigurationError and check the 
cause to see if is an instanceof ProviderException, but I don't 
necessarily know what Provider threw the exception. Do you see the 
problem? If the ServiceConfigurationError also captured the name of the 
class, then I could figure out which Provider was throwing the exception 
and pass it back through.

Thanks,
Sean