Hey, there! I'm trying to incorporate graphql-kotlin into an existing spring boot rest application w...

# graphql-kotlin

[Chris Wicks]

Hey, there! I'm trying to incorporate graphql-kotlin into an existing spring boot rest application with starter-security, starter-web, etc. I'm wondering if there's any special configuration or caveats I should know about? I've created a few root-level queries, and the schema generation works as expected, but the /graphql endpoint isn't working (404), nor is the playground.

[Shane Myrick]

There should NOT (edit) be any additional configuration to expose the routes. Do you see the server starting up successfully and logging the schema to the console?

What is the exact URL you are sending operations to locally?

[Chris Wicks]

Yep, server starts and schema is logged to the console; i have my port configured to 8082, so I'm hitting http://localhost:8082/graphql with postman

[Chris Wicks]

i can get everything working just fine in a fresh project; I'm wondering if there are some dependencies that are stepping on each others toes? (e.g. spring security, starter-web)

[Chris Wicks]

i've noticed that in my fresh project, the server spins up using netty; my existing project uses tomcat; that's the only major difference I can see other than additional things like Spring Data initialization. Maybe it's security configuration, but I'm getting straight up 404s.

[Shane Myrick]

We are using Spring WebFlux, are you using spring-starter-web-flux? We can not support both Web MVC and WebFlux in the same server

See: https://expediagroup.github.io/graphql-kotlin/docs/spring-server/spring-overview#webflux-vs-webmvc

[Chris Wicks]

that's probably the issue; I'll give that a shot, thanks

[Chris Wicks]

yeah, that was it; Unfortunately our security config is tied to WebMVC; I'll have to look into refactoring to use WebFlux

[Shane Myrick]

If you have a lot of code using WebMVC you can still use the schema generator. You will just have to update the code used in graphql-kotlin-spring-server to work with MVC routes.

We have had this question come up before so if you had a compatible ``graphql-kotlin-spring-mvc-server` package, we would be happy to share it with the community

[Dariusz Kuc]

Spring also provides reactive version of spring security that supports WebFlux

[Chris Wicks]

Yeah, I've been playing around with that this afternoon; I'm wondering if you guys have used that internally at all? I'm having some issues getting it to work with your library. If I return raw data classes from my Queries (as I would expect to be able to, and am in fact able to do without security enabled) and annotate the Query class or individual methods with @PreAuthorize, I get messages such as must return an instance of org.reactivestreams.Publisher (i.e. Mono / Flux) in order to support Reactor Context

If I wrap the response in a Mono, I get schema validation issues

I'm admittedly new to both WebFlux and your GraphQL implementation. I'm weighing it as an option against com.graphql-java-kickstart:graphql-spring-boot-starter , which is what my team is currently using.

[Dariusz Kuc]

unfortunately I haven’t it used so won’t be much help, that being said the error for Mono can solved by registering adapter for it (see https://expediagroup.github.io/graphql-kotlin/docs/schema-generator/execution/async-models#rxjavareactor for details)

[Chris Wicks]

👍 I'll have a look, thanks for the tip