Cross website servlet to servlet communication framework

I did a lot of research on this but couldn't find a concrete answer. I want to write an application framework which defines server side interfaces which other people can implement and deploy on their servers in the form of small servlets. I want a way to be able开发者_Go百科 to do an RPC on these methods without having the hassle of dealing with packing and unpacking parameters in the request and response myself. I am sure a decent framework must exist for such a thing but I just cannot pinpoint the right one.

I'd appreciate if someone can point me in the right direction.

How about Java REST standard JAX-RS? There are multiple implementations: Jersey, RESTeasy, etc..

They serialize/deserialize objects automatically. REST is standard so client implementations exist for any language/platform.