title: Bidirectional async Java RPC
body: <p><a href="http://code.google.com/p/protobuf-rpc-pro/" rel="nofollow noreferrer">protobuf-rpc-pro</a> provides a bidirectional async RPC implementation for Java based on Protocol Buffers. Are there other like this (Protocol Buffers not necessary)? <a href="https://stackoverflow.com/questions/7293011/asynchronous-bidirectional-rpc">This question</a> is similar, but received only replies about Python.</p>