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
Finally , got my mistake. This was a problem caused by the eclipse build. Since the build was not proper, the class files where corrupted. I cleaned up the whole project, took a fresh build, now its working fine. Thanks for your replies.