Hi Thomas,

great to see you liked the idea of removing Guava for handling events.
Regarding your commment:

We didn't want to have two annotations on each listener

That's something I understand and fully agree on. The drawback of the solution from the blog you mentioned above is that all events are now handled asynchronously (noted in the blog, too). I also found the link in the blog post that mentioned a solution for this (having both, sync and async events). But that solution comes with some more configuration overhead that is not really necessary I think.

My proposal would be to use Meta-Annotations instead. Create your own annotation for that, like this one:

@Target({ ElementType.METHOD, ElementType.ANNOTATION_TYPE })
@Retention(RetentionPolicy.RUNTIME)
@Documented
@EventListener
@Async
public @interface AsyncEventListener {

    @AliasFor(annotation = EventListener.class, attribute = "value")
    Class<?>[] value() default {};

    @AliasFor(annotation = EventListener.class, attribute = "classes")
    Class<?>[] classes() default {};

    @AliasFor(annotation = EventListener.class, attribute = "condition")
    String condition() default "";
}

The benefit would be you can drop the special configuration class and the much more useful benefit would be you could control the behaviour (sync/async) on the listeners side. What makes it much more flexible for you.

Try it.
Have fun.
Happy coding.

Jörg

Hi,
stumbled about your bog posts and this one and came to this repo. Had a look into it and found a configuration for the eventbus provided by guava library. Also used it years ago for application-internal events. But that's not needed anymore. Spring has it's own eventbus since years now and also provide an annotation based model (and I guess that's what you maybe liked on guavas, right?).
Have a look to the well documented feature. And yes, also async event handling is supported. There is no need for guava dependency anymore ( 2.7 MB in size btw. ). At least not for application internal event handling. ;-)

Happy Coding