The following stacktrace is what I get when i try to access a servlet, which seems running fine from Tomcat manager.
11 Sep, 2012 11:50:12 AM org.apache.catalin
After looking into the Exceptions, you got, some where you have misplaced the jar files
(servlet-api.jar). It should be under your Project/WEB-INF/lib folder. I think it will
works if your jar files are in the path specified above.