Gary,
You haven’t really given us much information to go on to help you troubleshoot any problem you are having. If you just are curious how debugging is done this is covered at length both in the Help section of MyEclipse and in the Documentation section of our site, more specifically these two guides cover it:
http://www.myeclipseide.com/images/tutorials/quickstarts/webprojects/
and
http://www.myeclipseide.com/images/tutorials/quickstarts/appservers/
If you are having more specific trouble related to Resin, you need to tell us exactly what the problem is, and answer all the questions we ask in the Potsing Guidelines at the top of each forum.
There are even FAQ entries to read that cover JSP debugging under Resin here:
http://www.myeclipseide.com/PNphpBB2+file-viewtopic-t-10405.html
and here: http://www.myeclipseide.com/PNphpBB2+file-viewtopic-t-10409.html
See if any of those resources help you, if you have further questions please let us know.