Spring Reactive xml payload exception java.lang.IllegalStateException: Failed to resolve argument 0 of type 'reactor.core.publisher.Mono'

Question

I have a spring boot application. trying to send xml payload through postman to a Post request. I get the following exception

java.lang.IllegalS         


        

Answer 1

Could you explain what are you trying to achieve in your Controller?

This error probably comes from the fact that you're calling subscribe in your controller method, effectively consuming the incoming Flux and returning at the same time.

As a general rule, you shouldn't subscribe to Publishers within your Controllers.