I'm trying to enable a Spring Cloud Gateway app to automatically refresh its routing config yml on the fly. I have been able to set up a Cloud Config server to host the route YAML and enabled the Spring Cloud Gateway to automatically refresh its config via a @Scheduled contextRefresher.refresh() usage. However, this requires two running apps, and we want to try to minimize the number of additional servers needed to support this requirement.
The Spring Cloud Config Server documentation suggests any boot app can be embedded with a config server via the @EnableConfigServer annotation: https://cloud.spring.io/spring-cloud-static/spring-cloud.html#_spring_cloud_config_server
However, when attempting to introduce the spring-cloud-config-server module in my Gateway's build.gradle, I run into the following error on startup:
org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'org.springframework.http.codec.ServerCodecConfigurer' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {}
From the discussion here (https://github.com/spring-cloud/spring-cloud-gateway/issues/319) it seems that the issue above arises because spring-boot-starter-web is incompatible w/ Gateway; Gateway is a Netty app and spring-boot-starter-web uses tomcat/servlets. When trying to exclude spring-boot-starter-web from the cloud-config-server module, the app fails again w/:
onfigReactiveWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanDefinitionStoreException: Failed to process import candidates for configuration class [org.springframework.cloud.config.server.config.ConfigServerAutoConfiguration]; nested exception is java.io.FileNotFoundException: class path resource [org/springframework/web/servlet/config/annotation/WebMvcConfigurerAdapter.class] cannot be opened because it does not exist
Is it the case that a Spring Cloud Gateway app cannot be enabled as a CloudConfig server? Or am I missing something.
FWIW my sprincCloudVersion is Finchley.SR1
