From this post on the Zend Developer Zone, we learn about an article over on the Sun Developer Network by Joe McCabe about installing PHP on a Sun Java System Web Server version 7.0.

un Java System Web Server is a mature, highly scalable, and secure web server that provides process redundancy, request scalability, and a wide range of application programming interfaces (APIs) to create and serve dynamic content. This document describes how to install and use PHP with Sun Java System Web Server (hereafter Web Server).

The tutorial is divided up into seven sections (including some reference material):

• Understanding PHP and Web Server
• Running the PHP Engine
• Installing the PHP Engine as a CGI Program
• Installing the PHP Engine as a FastCGI Server
• Installing the PHP Engine as an NSAPI Plugin
• Conclusion
• References

For each, there's plenty of code/configuration options to help clarify what needs to be set up no matter if you need the CGI version, FastCGI, or the NSAPI plugin up and running.