As long as everything works as expected, the IDE won't need to tell the user that something has gone wrong. Unfortunately, even the most optimistic programmer won't believe that the code will work in every situation. Bad data, threading issues, simple bugs, and environmental issues can result in operations failing, and when they fail, the user needs to be notified.
Eclipse has built-in mechanisms to report problems, and these should be used in response to a user interaction that has failed.