RMIIO is a library that makes it as simple as possible to stream large amounts of data using the RMI framework (or any RPC framework). The RMI framework makes it very easy to implement remote communication between Java programs, yet does not provide any ready solutions for sending large files without blowing out memory on the client or server. What you really want to do is stream data from the client to the server using a framework that does not really expose streaming. The RMIIO library provides some very powerful classes that enable a client to stream data to the server using only a few extra lines of code.
RMI WebSocket provides a library for remote method invocations between a browser and a Jetty Web Server using the HTML5 WebSocket. The idea is to enable tight method-level integration between the user interface and the server so that patterns such as MVP (Model-View-Presenter) can be applied in a Web environment. The method-level communications between the browser code and the server code allows the developer to think about the Web page and server-side components as objects in a UML world. Details such as the over-the-wire protocols in WebSockets are abstracted away in the process.