在做spring cloud gateway示例的时候遇到个启动错误:
*************************** APPLICATION FAILED TO START *************************** Description: Parameter 0 of method modifyRequestBodyGatewayFilterFactory in org.springframework.cloud.gateway.config.GatewayAutoConfiguration required a bean of type 'org.springframework.http.codec.ServerCodecConfigurer' that could not be found. Action: Consider defining a bean of type 'org.springframework.http.codec.ServerCodecConfigurer' in your configuration.
错误解决方法:
将pom.xml中关于spring-boot-start-web模块的jar依赖去掉。
错误分析:
根据上面描述(Description)中信息了解到GatewayAutoConfiguration这个配置中找不到ServerCodecConfig这个Bean。
spring cloud gateway server项目是一个spring boot项目,在启动的时候会去加载它的配置,其中有一个叫做GatewayClassPathWarningAutoConfiguration的配置类中有这么一行代码:
@Configuration @ConditionalOnClass(name = "org.springframework.web.servlet.DispatcherServlet") protected static class SpringMvcFoundOnClasspathConfiguration { public SpringMvcFoundOnClasspathConfiguration() { log.warn(BORDER+"Spring MVC found on classpath, which is incompatible with Spring Cloud Gateway at this time. "+ "Please remove spring-boot-starter-web dependency."+BORDER); } }
因为spring cloud gateway是基于webflux的,如果非要web支持的话需要导入spring-boot-starter-webflux而不是spring-boot-start-web。