Getting the absolute or relativ (file)path to servlet location

hi
my servlet needs to create some files. thatfor i need a reference location such as the root of the webapp dir or the location of the servlet or something like this, so i can build the paths relative to the servlet/webapp location.
is there a way to get this information? i just read the servlet api docu and couldn't find a appropriate methode. Only thing i found out is that the Fileobject seems to create relative paths from the bin dir of my tomcat installation.... but that's not very usefull.
any ideas? how do you solve that problem?

Ok... the getResource() method returns jndi:localhost/examples/... but I'm not sure the jndi: is what I want or what will work. The getRealPath() method is not bad, I can save to files using my Tomcat Server. I just was not expecting it to get the harddrive location instead of the URL location. Does anyone know if using this harddrive location will work when loaded onto a real webserver and no longer Tomcat? If it will then great!

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