Date: 2011aug14 Update: 2025aug5 Product: Eclipse Q. Eclipse: Avoid getting the "out of sync" error in Eclipse A. This means the file on disk was modified at a different time than the file Eclipse has in memory. There is a option to auto-refresh:

Window > Preferences > General > Workspace > Refresh automatically

This should avoid "out of sync" happening. However if you get "out of sync" you can press F5 to refresh.