I'm running JWSDP1.6 on Os X Tiger, but with Tomcat 5.0, not Tomcat 5.5. Tomcat 5.5 is not a supported platform for JWSDP (unfortunately), and I could not find trace of someone who successfully installed it.
Beware the other head of science - it bites! Nibble on this message:
professionally read, modify and write PDF files from Java