I’ve just tried compiling a project exported from one of our repositories. The export included some .class files, and when I tried to compile the project in Eclipse I got multiple error messages along the lines of:

cannot find symbol
Although this can be a classpath issue, I also found an interesting tip on a random forum. It essentially states that if you end up in a situation where existing .class files are older than your current source but have a newer file timestamp, you can get the above error.

The solution: delete any existing .class files and re-compile. It worked for me. :)