- a java runtime environment, preferably the latest release of version 6 (http://www.oracle.com/technetwork/java/javase/downloads/),
- the latest release of the reference implementation of JAX-WS, currently version 2.2.6 (http://jax-ws.java.net/), and
- the current version of graphviz (http://www.graphviz.org/Download.php).
In case you start the server under Mac OS and have Security issues, try this fix described in the Viewing Ptolemy Models section.
The server of KWebS is implemented in java. Therefore we begin the installation with the java runtime environment. The server uses a SOAP web service based on JAX-WS and the java platform comes with support for JAX-WS already. The included version is quite old, therefore, after you installed the java runtime, you need to update the built-in version by using the endorsed-mechanism from java: