category: random problems with Java. Mainly interesting for google searchers that have similar problems.

Developing for Eclipse WTP (perhaps using Eclipse 3.2) and you feel that the code you program, the servlets and JSPs are actually never synchronized with the web application and the running code is different from the development version?

I experience this sometimes. Then, I don't know exactly what to do, but deleting the temp-files of the server seems a good way to go.
The temp files are in:
%lt;your workspace folder>\.metadata\.plugins\org.eclipse.wst.server.core\tmp

Actually, this broke the server, so I deleted the server and created it again (to to the J2EE perspective, servers in the package explorer, delete your server, and run the web application again on a new server)