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 perfectly fine, everything worked before. Clicking on "Import 'DoodleClient' ..." does nothing.
What I did before this problem occured:
git rm *.class
Alternatively, you can highlight the project :
Choose Clean ...
from Project menu and if you have activated the Build Automatically
option (in the same menu), the classes will be generated anew.