well, I got run time error when I ran the vendor's sample code in RAD7 with IBM's JDK5. But I can tun it in
tomcat 5.5 with Sun's JDK 5.
I can compile the web application in both JDKs as you mentioned.
I asked IBM's technical support, they said RAD7 can only run with IBM's JDK on windows. They don't suggest to switch JDK.