For every version of Eclipse I\'ve used prior to Juno, ctrl+click would find the declaration of a variable/class/method. It was an extremely useful feature when d
If you're working on a large project and are working with a repository, you could just have the file opened via the wrong project, I just had two instances of the file open, where one was the one where I couldn't do Ctrl + click, while on the other file I could Ctrl + click on it successfully.