I\'m having a problem running tomcat 6 with eclipse 3 in ubuntu.
I installed tomcat 6 on my machine and when I tested it using http://localhost:8080, it
ok, so here's what worked for me: you must go to Window>Preferences
here, go to Server>Runtime Environments
remove the old server or add your server or change the server location...
(in my case, this problem arised when i changed the tomcat server location)
now you should be able to add new servers to your environment :)