I had the same problem. What helped was:
- Restart Eclipse
- Select from top menu Project -> Clean…
- Clean all projects that use Lombok
If it will not help, try again from point 1. (I know it sounds stupid but it worked on my PC on second try.)
Also, I’m using Lombok version 1.16.4 (and Eclipse Mars of course)
BTW: Make sure that you have lombok.jar in the eclipse directory.