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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.gatewayHttpClient(GatewayAutoConfiguration.java:675)

The following method did not exist:

    reactor.netty.resources.ConnectionProvider.elastic(Ljava/lang/String;Ljava/time/Duration;Ljava/time/Duration;)Lreactor/netty/resources/ConnectionProvider;

The method's class, reactor.netty.resources.ConnectionProvider, is available from the following locations:

    jar:file:/D:/Devtools/maven/repository/io/projectreactor/netty/reactor-netty/0.9.1.RELEASE/reactor-netty-0.9.1.RELEASE.jar!/reactor/netty/resources/ConnectionProvider.class

It was loaded from the following location:

    file:/D:/Devtools/maven/repository/io/projectreactor/netty/reactor-netty/0.9.1.RELEASE/reactor-netty-0.9.1.RELEASE.jar


Action:

Correct the classpath of your application so that it contains a single, compatible version of reactor.netty.resources.ConnectionProvider


Process finished with exit code 1

修改版本前

<properties>
　　<spring-boot.version>2.2.3</spring-boot.version>
   <spring-cloud.version>Hoxton.SR3</spring-cloud.version>
   <com-alibaba-cloud.version>2.2.1.RELEASE</com-alibaba-cloud.version>
</properties>
修改后

<properties>
　　<spring-boot.version>2.2.1</spring-boot.version>
   <spring-cloud.version>Hoxton.SR1</spring-cloud.version>
   <com-alibaba-cloud.version>2.2.1.RELEASE</com-alibaba-cloud.version>
</properties>

参考：https://www.jianshu.com/p/f47ebd1eaa51