i had the same problem on jboss3.0.0beta and tomcat4.0.2.
recompile my war files with jar -cvf warfilename.war *.
deployed it and all errors went away.
add jboss-web.xml is ok!
I have the same problem that ccm682, I tried the solutions of ngarcia and bolo but I can't get JSP compile.
Did you find the solution?. Please share it