JCSP (Communication Sequential Processes for Java) is a
library providing a concurrency model that is a combination
of ideas from Hoare's CSP and Milner's pi-calculus.

Communicating Sequential Processes (CSP) is a mathematical
theory for specifying and verifying complex patterns of
behavior arising from interactions between concurrent
objects.

JCSP provides a base range of CSP primitives plus a rich set of
extensions. Also included is a package providing CSP process
wrappers giving a channel interface to all Java AWT widgets
and graphics operations. It is extensively (java/documented)
and includes much teaching.

JCSP is an alternative concurrency model to the threads and
mechanisms built into Java. It is also compatible with
it since it is implemented on top of it.