I am attempt to observe on java.lang.Void but my 204 responses are still coming back with null pointer exceptions: https://gist.github.com/pymblesoftware/30a26505af653a495f95983ad1528958 How do I handle 204s..?

Try using

Unit

instead of

Void

. You can't have

null

items in your stream in RxJava2, so you can't get emissions from

Observable<Void>

.

ah no, I think I originally tried observing on Unit and I just tried again but that also comes back with the same null pointer exception. I may have to shelve it and move onto other code and come back to it...

@Regan Russell, you can use Observable<Response<Void>> instead Observable<Void>

cool, hang on a a sec I have to stash some stuff and I will check it out.

You're welcome

Completable?

@Regan Russell +1 for Completable But if you still need Unit you can use this approach: https://github.com/square/retrofit/issues/2329#issuecomment-301316873

Thanks.