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
I had the same problem! Spent 2 hours searching for solution! And here it is!
WebContent (under Dynamic Web Project) -> WEB-INF -> lib (it's empty- all right) -> right click on it (lib) -> Build Path -> Use as Source Folder.
DONE!