I upgraded recently to the new Eclipse version (Oxygen). I downloaded the lombok.jar from the website and installed it. This is how the eclipse.ini looks like a
You can install lombok through command line very easily, ~/softwares/Eclipse.app/ path to your eclipse or sts app (this is on mac) but it will also work for different OS, and it will give you the successful output.
java -jar lombok.jar install ~/softwares/Eclipse.app/
Output:
Lombok installed to: /Users/temp/softwares/Eclipse.app