报错信息：

2021-08-17 15:39:39.004  WARN 29619 --- [           main] onfigReactiveWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'org.springframework.security.config.annotation.web.reactive.WebFluxSecurityConfiguration': Unsatisfied dependency expressed through method 'setSecurityWebFilterChains' parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'springSecurityFilterChain' defined in class path resource [com/zclh/gsch/gateway/config/ResourceServerConfig.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.security.web.server.SecurityWebFilterChain]: Factory method 'springSecurityFilterChain' threw exception; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'org.springframework.security.oauth2.jwt.ReactiveJwtDecoder' available
2021-08-17 15:39:39.005  INFO 29619 --- [           main] com.alibaba.druid.pool.DruidDataSource   : {dataSource-0} closing ...
2021-08-17 15:39:39.035  INFO 29619 --- [           main] ConditionEvaluationReportLoggingListener : 

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2021-08-17 15:39:39.053 ERROR 29619 --- [           main] o.s.b.d.LoggingFailureAnalysisReporter   : 

***************************
APPLICATION FAILED TO START
***************************

Description:

Parameter 0 of method setSecurityWebFilterChains in org.springframework.security.config.annotation.web.reactive.WebFluxSecurityConfiguration required a bean of type 'org.springframework.security.oauth2.jwt.ReactiveJwtDecoder' that could not be found.


Action:

Consider defining a bean of type 'org.springframework.security.oauth2.jwt.ReactiveJwtDecoder' in your configuration.

解决方案

检查配置文件是否正确

spring:
 security:
    oauth2:
      resourceserver:
        jwt:
          jwk-set-uri: http://localhost:9401/rsa/publicKey #配置RSA的公钥访问地址

我这里就是这个原因。

参考：

spingCloud gateway 启动报错： xxx.ReactiveJwtDecoder that could not be found

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