The attempt was made from the following location 的bug问题

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APPLICATION FAILED TO START
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Description:

An attempt was made to call a method that does not exist. The attempt was made from the following location:

    org.springframework.cloud.gateway.config.GatewayAutoConfiguration$NettyConfiguration.reactorNettyWebSocketClient(GatewayAutoConfiguration.java:738)

The following method did not exist:

    org.springframework.web.reactive.socket.client.ReactorNettyWebSocketClient.setHandlePing(Z)V

The method's class, org.springframework.web.reactive.socket.client.ReactorNettyWebSocketClient, is available from the following locations:

    jar:file:/D:/maven/repository/org/springframework/spring-webflux/5.2.3.RELEASE/spring-webflux-5.2.3.RELEASE.jar!/org/springframework/web/reactive/socket/client/ReactorNettyWebSocketClient.class

It was loaded from the following location:

    file:/D:/maven/repository/org/springframework/spring-webflux/5.2.3.RELEASE/spring-webflux-5.2.3.RELEASE.jar


Action:

Correct the classpath of your application so that it contains a single, compatible version of org.springframework.web.reactive.socket.client.ReactorNettyWebSocketClient

Disconnected from the target VM, address: '127.0.0.1:11801', transport: 'socket'

Process finished with exit code 1

先开始以为是maven包冲突了，故修改pom文件如下：

改完确实可以启动了，然后发现gateway路由的配置失效了，看控制台有这样一条消息：

Spring Webflux is missing from the classpath, which is required for Spring Cloud Gateway at this time. Please add spring-boot-starter-webflux dependency.

排除后，这个包没有了

最后发现是springboot与springcloud的版本不匹配问题，去查了官网发现匹配的springboot版本为2.2.5

修改springboot版本后，问题解决

还遇到了一个配置文件失效的问题，解决方案：

手动配置