Gateway启动失败：An attempt was made to call a method that does not exist.

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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:612)

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:/C:/Users/keydous/.m2/repository/io/projectreactor/netty/reactor-netty/0.9.2.RELEASE/reactor-netty-0.9.2.RELEASE.jar!/reactor/netty/resources/ConnectionProvider.class

It was loaded from the following location:

file:/C:/Users/keydous/.m2/repository/io/projectreactor/netty/reactor-netty/0.9.2.RELEASE/reactor-netty-0.9.2.RELEASE.jar

Action:

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

可能是版本的问题

<parent>
        <groupId>org.springframework.bootgroupId>
        <artifactId>spring-boot-starter-parentartifactId>
        <version>2.2.8.RELEASEversion>
        <relativePath/> 
    parent>
    <groupId>com.gyhgroupId>
    <artifactId>gatewayartifactId>
    <version>0.0.1-SNAPSHOTversion>
    <name>gatewayname>
    <description>gateway for forumdescription>

    <properties>
        <java.version>1.8java.version>
        <cloud.version>Hoxton.SR6cloud.version>
    properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starterartifactId>
        dependency>

        <dependency>
            <groupId>org.springframework.cloudgroupId>
            <artifactId>spring-cloud-starter-gatewayartifactId>
            <version>2.2.3.RELEASEversion>
        dependency>

        <dependency>
            <groupId>org.springframework.cloudgroupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discoveryartifactId>
            <version>0.2.2.RELEASEversion>
        dependency>

        <dependency>
            <groupId>org.springframework.cloudgroupId>
            <artifactId>spring-cloud-dependenciesartifactId>
            <version>${cloud.version}version>
            <type>pomtype>
            <scope>importscope>
        dependency>

        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-testartifactId>
            <scope>testscope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintagegroupId>
                    <artifactId>junit-vintage-engineartifactId>
                exclusion>
            exclusions>
        dependency>
    dependencies>

版本看上去有点乱，但是好使，否则总是启动失败。