I hit F5 ~1000 times and restarted eclipse (also with -clean), deleted /bin, but nothing helps. Manually importing DoodleClient does not help. DoodleClient exists and is perfect
The first thing I would do is create a new class in the same package and check if it is visible from this class where you have the issue.
Also I'm not sure but you could check to change the name of your class "D" for something different.
and ...Check if the file actually does exist