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Now I'm able to do everything, initially problem was that tornadofx `Rest` component is not reactive and also its configuration approach isn't flexible enough for me. So I've switched to Spring's WebClient. This part already works in my application, I've even implemented log-in/log-out and can make authenticated requests.
Now the real work begins - building all the screens and workflows, but the parts where reactive `Flux`s and `Mono`s touch with tornadofx stuff are a bit ugly.