GraphQLSubscription "InvalidDefinitionException" error about graphql-spqr-spring-boot-starter

[kaqqao]

The current starter doesn't yet support subscriptions in conjunction with WebFlux. If I'm not mistaken, that's what you meant by Spring reactive, right?
Subscriptions currently only work with Spring MVC (i.e. non-reactive apps).

[safaksahin]

Yes, i meant spring reactive. Thanks :)

[Andrulez]

@kaqqao Could you please add more detail to your explanation? This exapmle uses projectreactor for subscription demo but you write "The current starter doesn't yet support subscriptions in conjunction with WebFlux".

[kaqqao]

@Andrulez Subscriptions require a Publisher (and this is all SPQR cares about) and Reactor provides a convenient Publisher implementation, so you can use it freely (or RxJava if you prefer). And as long as your application is servlet based (Spring MVC) subscriptions will work out of the box, as the WebSocket backend is there.

What's not implemented is the reactive WebSocket part, and this is why subscriptions won't work out of the box in a WebFlux application. You can implement that part yourself of course using the servlet-based impl as an inspiration, but it's a non trivial effort. Built-in support is coming in the future.

[Andrulez]

@kaqqao Thank you for the answer and many other extremely useful answers on Stackoverflow! They helped me many times!

[manousos]

please try one of them http://www.reactive-streams.org/reactive-streams-flow-adapters-1.0.2-javadoc/org/reactivestreams/FlowAdapters.html