Thanks for the resources! By "best" I mean "truly built for backend services / web APIs", so it has no performance and scalability issues to be used as a backend for multiplatform applications. Any personal recommendations based on that?
It's not a silver bullet though - some reflection features aren't supported, and reflection in general requires a bit of config at compile time to make sure all the required classes are loaded. This can make some plugin architectures unworkable, although I maintain that if you need reflection for pluggable code, you're probably doing it wrong.