Just put lombok on the classpath when compiling with any javac (version 1.6 - 1.8): javac -cp lombok.jar ....

Support for JDK9, if you haven't modularized your own projects yet (no module-info.java yet), is included in lombok starting with version 1.16.20. Just use lombok as normal: javac -cp lombok.jar ...

Support for JDK9 if you did modularize your own projects (you've written a module-info.java file) is available in the edge release. To use it: javac -cp lombok.jar -p lombok.jar ...
Note that you will have to add lombok to your module-info.java file:

module myapp {
	requires static lombok;
}

The 'static' part ensures that you won't need lombok to be present at runtime.

Feedback about JDK9 module-info support can be given at github issue #985.