1、错误信息：The following method did not exist: reactor.netty.resources.ConnectionProvider
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Builder.evictInBackground(Ljava/time/Duration;)Lreactor/netty/resources/ConnectionProvider
Builder.evictInBackground(Ljava/time/Duration;)Lreactor/netty/resources/ConnectionProviderConnectionPoolSpec;
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.2021-11-17 13:50:00.745 ERROR 4936 --- [ main] o.s.b.d.LoggingFailureAnalysisReporter : ***************************APPLICATION FAILED TO START***************************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$NettyConfiguration.buildConnectionProvider(GatewayAutoConfiguration.java:798)The following method did not exist: reactor.netty.resources.ConnectionProvider$Builder.evictInBackground(Ljava/time/Duration;)Lreactor/netty/resources/ConnectionProvider$ConnectionPoolSpec;The method's class, reactor.netty.resources.ConnectionProvider$Builder, is available from the following locations: jar:file:/E:/mvn_repo/io/projectreactor/netty/reactor-netty/0.9.11.RELEASE/reactor-netty-0.9.11.RELEASE.jar!/reactor/netty/resources/ConnectionProvider$Builder.classThe class hierarchy was loaded from the following locations: reactor.netty.resources.ConnectionProvider.Builder: file:/E:/mvn_repo/io/projectreactor/netty/reactor-netty/0.9.11.RELEASE/reactor-netty-0.9.11.RELEASE.jar reactor.netty.resources.ConnectionProvider.ConnectionPoolSpec: file:/E:/mvn_repo/io/projectreactor/netty/reactor-netty/0.9.11.RELEASE/reactor-netty-0.9.11.RELEASE.jarAction:Correct the classpath of your application so that it contains a single, compatible version of reactor.netty.resources.ConnectionProvider$BuilderDisconnected from the target VM, address: '127.0.0.1:51122', transport: 'socket'Process finished with exit code 1当运行Spring Cloud Gateway时，出现了如下错误，为什么出现这样的错误呢？在之前，已经按照这种方式成功启动过Spring Cloud Gateway程序了，为什么这次又不行了呢？
问题原因： 出现该问题的原因，是因为我在搭建Spring Cloud Gateway环境的时候，使用的SpringBoot、SpringCloud 和 SpringCloud Alibaba 组件的时候，版本不一致造成的，通过修改其中引用的组件版本，可以修改该问题。版本兼容如下所示：
详细请查看《阿里巴巴 官方 版本说明》。
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