springcloud 搭建gateway时容易出现的异常

搭建springcloud项目的时候以 zookeeper为注册中心 gateway为路由 启动时出现以下报错：

---

```bash

```vbnet

```java
Spring MVC found on classpath, which is incompatible with Spring Cloud Gateway at this time. Please remove spring-boot-starter-web dependency.

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2019-05-05 09:41:19.216 WARN [-,,,] 10084 --- [ main] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'routeDefinitionRouteLocator' defined in class path resource [org/springframework/cloud/gateway/config/GatewayAutoConfiguration.class]: Unsatisfied dependency expressed through method 'routeDefinitionRouteLocator' parameter 1; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'modifyRequestBodyGatewayFilterFactory' defined in class path resource [org/springframework/cloud/gateway/config/GatewayAutoConfiguration.class]: Unsatisfied dependency expressed through method 'modifyRequestBodyGatewayFilterFactory' parameter 0; nested exception is 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: {}
2019-05-05 09:41:19.219 INFO [-,,,] 10084 --- [ main] o.apache.catalina.core.StandardService : Stopping service [Tomcat]
2019-05-05 09:41:19.234 INFO [-,,,] 10084 --- [ main] ConditionEvaluationReportLoggingListener :

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2019-05-05 09:41:19.401 ERROR [-,,,] 10084 --- [ main] o.s.b.d.LoggingFailureAnalysisReporter :

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APPLICATION FAILED TO START
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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.

 

 

原因：

　　在类路径上找到了SpringMVC，此时它与SpringCloudGateway不兼容。请删除Spring Boot Starter Web依赖项。

　　然后看pom.xml里面并没有依赖SpringMVC相关依赖，然而是zookeeper里面依赖了web，SpringCloudGateway依赖于webflux 所以不兼容

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