spring-boot-starter-webflux版本冲突问题

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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.gatewayHttpClient(GatewayAutoConfiguration.java:622)

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/K/.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/K/.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

解决方法

• 先看是哪个类少了哪个方法
• 去mavenrepository仓库找一个有这个方法的版本替换上去

搞定

举例：



并且由控制台提示可以看到，这个ConnectionProvider是在reactor-netty-0.9.2.RELEASE.jar中

接下来我们去mavenrepository仓库找一个其他版本（最好找一个大版本一致，并且star多的，一般就可以了）

于是我选中了0.9.12版本

接下来修改POM文件

		
        <dependency>
            <groupId>org.springframework.cloudgroupId>
            <artifactId>spring-cloud-starter-gatewayartifactId>
            <exclusions>
                <exclusion> 
                    <groupId>io.projectreactor.nettygroupId>
                    <artifactId>reactor-nettyartifactId>
                exclusion>
                <exclusion> 
                    <groupId>org.springframeworkgroupId>
                    <artifactId>spring-webfluxartifactId>
                exclusion>
            exclusions>
        dependency>
        
        <dependency>
            <groupId>io.projectreactor.nettygroupId>
            <artifactId>reactor-nettyartifactId>
            <version>0.9.12.RELEASEversion>
        dependency>
        <dependency>
            <groupId>org.springframeworkgroupId>
            <artifactId>spring-webfluxartifactId>
            <version>5.2.9.RELEASEversion>
        dependency>
        <dependency>
            <groupId>org.springframeworkgroupId>
            <artifactId>spring-webartifactId>
            <version>5.2.9.RELEASEversion>
        dependency>

最后，启动spring-cloud-gateway

成功！

最新补充：
上面的0.9.12版本升的太高了，导致出现了一些新问题，所以将版本修改为0.9.7解决了问题