So I’m coding along and all of a sudden, Eclipse (3.4) can’t resolve classes. Classes that are in the same package as the class I’m editing. Classes that are fully qualified in the import statement.
Not good.
The last thing I had done was add a Spring @Autowired annotation. I saved the file and voila, everything goes to crap. I then spend a stupid amount of time trying to track down the cause. I took the changes out. I did a clean and rebuild and retest (everything passed; this was Eclipse-only). I added new classes to see if they broke (they did). I did a false modify (add space, remove space, save) to see if that broke said file (it did). It was a death spiral. No matter how I changed the code, the same problem was there.
Turns out, it wasn’t the annotation, or anything else in Spring, or any of my code, or any of my Eclipse plugins. It was a step before that killed me. I was doing a little cleanup and I created a temp directory at the top of my project folder so I could move some files there. It wasn’t nested in anything, other than the top level directory. What could go wrong?
Apparently, that makes Eclipse see red. Squiggly red.
The solution was simply to do a refresh (F5) on my project. Just as quickly as it started, the problem went away. That smells like a bug to me, but if it was I figure I’d see a lot more mentions in Google or the Eclipse bug tracker. I’m really hoping this helps someone save some time.
Update: If that doesn’t help you, see more solutions in the comments. Thanks to those who contributed them.
Keywords: false error, bogus error, eclipse bug
Thanks a lot, Kamil!
It solved my problem.
still i am getting that error even though i applied all the above tips …. pls help me
I have had this problem for a long time with Eclipse Helios. Usually doing a Project Clean and then a project Refresh clears it up. Not today. I do most builds with Ant and that seems to mess it up. I agree it is a bug and a very annoying one.
Thanks a million for the “project – clean” suggestion. I had the same problem and this solution worked for me. Good times
The way it worked for me was to include all .h files that the red underline refer to, compile it clean, and then remove them. Seems that Eclipse has problem to automatically find the path but once does it holds into it.
This kind of stuff is the reason i hate programming. I don’t have a problem with logic errors, syntax errors, etc. but Christ’s dusty nuts I hate bureaucracy.
I started with a completely new set up. Wrote a hello world program. It worked fine. Then I tried to use Date(): cannot resolve class. Tried GregorianC…cannot resolve class. Everything: cannot resolve class.
10 minutes into playing with Eclipse and I am searching for obscure error.