Server Tomcat v7.0 Server at localhost was unable to start within 101 seconds. If the server requires more time, try increasing the timeout in the server edit
If you are running into this on Mac and you installed Tomcat using brew, one good way to get round that is to install Tomcat using a zip file instead.
brew
Go here, download a zip file, unzip it, and in Eclipse, create a new server and specify "Tomcat installation directory" as the unzipped file.