springcloud 启动一直报错 详细错误信息
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.
解决办法
将pom文件中的spring-boot-starter-web 移除
详细分析
点进去 GatewayAutoConfiguration 这个类
@Bean public ModifyRequestBodyGatewayFilterFactory modifyRequestBodyGatewayFilterFactory(ServerCodecConfigurer codecConfigurer) { return new ModifyRequestBodyGatewayFilterFactory(codecConfigurer.getReaders()); } @Bean public DedupeResponseHeaderGatewayFilterFactory dedupeResponseHeaderGatewayFilterFactory() { return new DedupeResponseHeaderGatewayFilterFactory(); } @Bean public ModifyResponseBodyGatewayFilterFactory modifyResponseBodyGatewayFilterFactory(ServerCodecConfigurer codecConfigurer, Set<MessageBodyDecoder> bodyDecoders, Set<MessageBodyEncoder> bodyEncoders) { return new ModifyResponseBodyGatewayFilterFactory(codecConfigurer.getReaders(), bodyDecoders, bodyEncoders); }
确实需要这个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 代码入下
@Configuration( proxyBeanMethods = false ) //在 GatewayAutoConfiguration 执行执行 @AutoConfigureBefore({GatewayAutoConfiguration.class}) public class GatewayClassPathWarningAutoConfiguration { private static final Log log = LogFactory.getLog(GatewayClassPathWarningAutoConfiguration.class); private static final String BORDER = "\n\n**********************************************************\n\n"; public GatewayClassPathWarningAutoConfiguration() { } @Configuration( proxyBeanMethods = false ) @ConditionalOnMissingClass({"org.springframework.web.reactive.DispatcherHandler"}) protected static class WebfluxMissingFromClasspathConfiguration { public WebfluxMissingFromClasspathConfiguration() { GatewayClassPathWarningAutoConfiguration.log.warn("\n\n**********************************************************\n\nSpring Webflux is missing from the classpath, which is required for Spring Cloud Gateway at this time. Please add spring-boot-starter-webflux dependency.\n\n**********************************************************\n\n"); } } @Configuration( proxyBeanMethods = false ) @ConditionalOnClass( name = {"org.springframework.web.servlet.DispatcherServlet"} ) protected static class SpringMvcFoundOnClasspathConfiguration { public SpringMvcFoundOnClasspathConfiguration() { GatewayClassPathWarningAutoConfiguration.log.warn("\n\n**********************************************************\n\nSpring MVC found on classpath, which is incompatible with Spring Cloud Gateway at this time. Please remove spring-boot-starter-web dependency.\n\n**********************************************************\n\n"); } } }
我们pom中依赖了spring-boot-starter-web 也就是存在 org.springframework.web.servlet.DispatcherServlet
此时这个 与Spring Cloud Gateway不兼容
spring cloud gateway是基于webflux的,如果需要web支持的话需要导入spring-boot-starter-webflux取代spring-boot-start-web。