jsp custom tag help

I was trying to follow the example on this site: http://www.brics.dk/~amoeller/WWW/jsp/customtags.html.

If successful, the custom.jsp page should have a red background. I don't get any errors, but my page does not turn red. I am working with JDK 1.3.1_07 and jakarta-tomcat-4.1.27. Could it be I am not compiling correctly? I don't get an error when I compile, but another site mentions a servlet.jar. Would I have gotten a compile error if I didn't have servlet.jar?

I added the line System.out.println("made it here"); as the first line after the doStartTag() try{
but I do not get any messages in the tomcat console.

How else can I troubleshoot this? TIA