Spring Security No provider found for OAuth2AuthorizationCodeAuthenticationToken when running Spring Native Reactive app using OAuth2

Describe the bug Logging in using reactive OAuth2 built with native throws after redirect from OAuth2 server(Google in my case).

java.lang.IllegalStateException: No provider found for class org.springframework.security.oauth2.client.authentication.OAuth2AuthorizationCodeAuthenticationToken
        at org.springframework.security.web.server.authentication.AuthenticationWebFilter.lambda$authenticate$6(AuthenticationWebFilter.java:123) 

Do note that the non-reactive counterpart does work and is able to find the provider correctly.

To Reproduce run gradlew bootBuildImage, run the docker image that is created, and attempt to login via OAuth2.

Expected behavior Login with reactive Oauth2 without error

Sample

Here is a repo with a working example minus client id/secrets for the oauth2 client

Comment From: marcusdacoregio

Hi @msosa, thanks for the report.

The problem here is that there is no hint for JwtDecoder that is used here. In the meantime, while I'm working on the fix and the version is not released, you can workaround that by changing your application to include that hint:

@SpringBootApplication
@ImportRuntimeHints(MyHints::class)
class ReactiveOauth2Application

fun main(args: Array<String>) {
    runApplication<ReactiveOauth2Application>(*args)
}


class MyHints: RuntimeHintsRegistrar {

    override fun registerHints(hints: RuntimeHints, classLoader: ClassLoader?) {
        hints.reflection().registerType(TypeReference.of("org.springframework.security.oauth2.jwt.JwtDecoder"), MemberCategory.INVOKE_PUBLIC_CONSTRUCTORS)
    }

}

Comment From: msosa

Awesome! I did try adding a few hints but not this one. Appreciate you looking into it.