Record a bug of FeGin

tags: java springcloud spring boot spring

 HttpResult httpResult = ssoAuthControllerFeign.checkToken(tokens.get(0));

The code came here, and reported an exception when making fegin calls;
The general error is
feign.codec.DecodeException: No qualifying bean of type 'org.springframework.boot.autoconfigure.http.HttpMessageConverters' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)} at feign.AsyncResponseHandler.decode(AsyncResponseHandler.java:119) ~[feign-core-10.10.1.jar:na] Suppressed: reactor.core.publisher.FluxOnAssembly$OnAssemblyException: Error has been observed at the following site(s): |_ checkpoint ⇢ org.springframework.cloud.gateway.filter.WeightCalculatorWebFilter [DefaultWebFilterChain] |_ checkpoint ⇢ org.springframework.boot.actuate.metrics.web.reactive.server.MetricsWebFilter [DefaultWebFilterChain] |_ checkpoint ⇢ HTTP GET "/java/sayHi" [ExceptionHandlingWebHandler]

Spring did not load this bean caused;
This problem occurs because Gateway does not have a SpringMVC that uses WebFlux's way, so there is no converter;
[Suddenly I remembered the previous introduction of Gateway dependencies, I prompt me Spring-boot-web conflict to let me delete it. It turns out that this is the backhand]

So we only need to manually introduce this bean.
Can be under the startup class. You can also have another configuration class, manually injecting this bean into the container, and the problem is solved.

@Configuration
public class Config {
    @Bean
    @ConditionalOnMissingBean
    public HttpMessageConverters messageConverters(ObjectProvider<HttpMessageConverter<?>> converters) {
        return new HttpMessageConverters(converters.orderedStream().collect(Collectors.toList()));
    }
}

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