...While it may only support text-based APIs, it simplifies system aspects dramatically and makes it much easier to unit test your conversions.
Feign makes use of great tools like Jersey and CXF for writing Java clients for ReST or SOAP services. It also lets you write your own code on top of http libraries, and connects your code to http APIs with little overhead.
Fast Parallel Async HTTP/SSH/TCP/UDP/Ping Client Java Library
Fast parallel async HTTP/SSH/TCP/UDP/Ping client java library on Akka. Aggregate 100,000 APIs & send results anywhere in 20 lines of code. View production use cases. Ping or HTTP calls 8000 servers with responses aggregated in 12 seconds. Parallec means Parallel Client (pronounced as "para-like"). Open Source from eBay Cloud. A convenient response context passes any object you need when handling a response.