I've correctly installed Lombok on my STS IDE by using the jar file, but no way it was working. The file was moved to Eclipse folder: just copying it to the Plugins folder and restarting was enough to fix my issue.
The technical blog of Francesco De Collibus.
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And there are more goodies in this area.
Another is in the Java --> Editor --> Save Actions, where you can specify what to do if a Java file is saved. Like format, at @Override and more...