Don't convert exceptions into runtime exceptions

Let something else handle the JAXBExceptions from this guy. It's not
really doing anything, nor is this actually a factory... :(
Applying dirty hax to the configuration Service.

This will go through all the available ear class loaders so it can try
to create a jaxb context for that classloader, if it can find the class.

It's either do this or rewrite the configuration service so that it
actually is classloader aware....
Need to use a short-circuting search through the things
Don't use the FilterConfig to get the ServletContext

Not guaranteed to have a filter config, but we are guaranteed to have a
servletcontext