Lombok is unfortunately a separate programming language, albeit insufficiently distinct from Java.

(Why? Because it uses internal compiler APIs to change the behaviour of code you write in ways that are not valid: annotation processors are supposed to generate new classes, not mutate existing classes.)

I went looking on their because for some reason I thought that an `@Async` annotation would already exist. But no such luck.

If you want to use something like this today, then you could take a look at Spring 's Async support. It also lets you supply the Executor.