springfox | Automated JSON API documentation for API 's built with Spring | REST library

Spring Boot 3.0 is built for Java17 and JakartaEE, not JavaEE. Spring Boot 3 is still under development and hasn't seen a final release yet. There has been no official release date yet, but expect nothing sooner than Q4 of 2022. Until then I wouldn't consider Spring Boot 3 for production (or maybe when they start releasing Release Candidates).

That being said, there is currently no SpringFox release that supports JakartaEE and therefore isn't usable with Spring Boot 3 (see this). So until that has been resolved the combination of SpringFox and Spring Boot 3 won't work.

Use 2.6.x (which at this moment is the latest release version of Spring Boot).

Please note that Spring Cloud Gateway is not compatible with Spring MVC (spring-boot-starter-web). This is outlined in section "How to include Spring Cloud Gateway in the official reference documentation":

Spring Cloud Gateway is built on Spring Boot 2.x, Spring WebFlux, and Project Reactor. As a consequence, many of the familiar synchronous libraries (Spring Data and Spring Security, for example) and patterns you know may not apply when you use Spring Cloud Gateway.

Additionally, it is stated that:

Spring Cloud Gateway requires the Netty runtime provided by Spring Boot and Spring Webflux. It does not work in a traditional Servlet Container or when built as a WAR.

As already suggested by the error message, you would need to remove the dependency on spring-boot-starter-web. You can list all your direct and transitive dependencies with the following command:

There’s a relatively new Gradle feature called “version catalogs”. With those you can centrally declare dependencies that you’d like to share between multiple projects of your build (or even between different builds).

In your concrete example, you’d add something like the following to your settings.gradle file:

I know this does not solve your problem directly, but consider moving to springdoc which most recent release supports Spring Boot 2.6.0. Springfox is so buggy at this point that is a pain to use. I've moved to springdoc 2 years ago because of its Spring WebFlux support and I am very happy about it. Additionally, it also supports Kotlin Coroutines, which I am not sure Springfox does.

If you decide to migrate, springdoc even has a migration guide.

I was facing the very same problem with azure dependencies last few days. Upgrading spring-boot-starter-parent to version 2.5.5 fixed it for me.

Are you using Spring WebClient to do REST backend calls? If that's the case, then something is wrong with your WebClient bean configuration for the analyticsService for the test profile.

If your're not using Spring Webflux, just remove it from the dependencies.

try either:

Since you are marking FeignClientConfiguration1 and FeignClientConfiguration2 classes with the @Configuration annotation, they'll be picked up "globally" for the Spring context which essentially means those beans relevant for Feign will be applied to all Feign clients.

I see you specified the configuration attribute on your @FeignClient annotation but that won't "undo" the global configuration.

The way to go is to remove the @Configuration annotation from FeignClientConfiguration1 and FeignClientConfiguration2 and use the @FeignClient configuration attribute only.