Regression CXF-3159: Jettison required for json processing with some classloader implementations

We recently upgraded our application from 2.3.x to 2.4.1 and we appear to be having trouble similar to that described in CXF-3159.

In CXF-3159 the fix was to basically force the vm to do more class initialization. I wonder if a better fix would be to just modify the JSONProvider to more eagarly check for a jettison class in a static initializer so that there is less reliance on Classloader implementations to find the existence of dependencies like this? I'd be happy to provide a patch if that would be useful.