Spring Cloud Gateway 2022已经使用reactor-core 3.x，WebFlux框架高度依赖Reactor，**建议保持和 Gateway Reactor版本同步**

[aaric]

使用版本:

latest
（io.projectreactor:reactor-core:3.1.4.RELEASE 发布年份2018-02-15）

报错信息：

ClassNotFoundException: reactor.util.context.ContextView

希望结果：

Spring Cloud Gateway不被影响

复现步骤：

1.正常搭建网关，引入依赖

ext {
    // https://github.com/alibaba/spring-cloud-alibaba/wiki/版本说明#毕业版本依赖关系推荐使用
    springCloudVersion = "2022.0.0"
    springCloudAlibabaVersion = "2022.0.0.0"
    knife4jVersion = "4.5.0"
    saTokenVersion = "1.37.0"
}

dependencyManagement {
    imports {
        mavenBom "org.springframework.cloud:spring-cloud-dependencies:$springCloudVersion"
        mavenBom "com.alibaba.cloud:spring-cloud-alibaba-dependencies:$springCloudAlibabaVersion"
        mavenBom "com.github.xiaoymin:knife4j-dependencies:$knife4jVersion"
        mavenBom "cn.dev33:sa-token-dependencies:$saTokenVersion"
     }
}

dependencies {
    implementation project(":v2x-common")

    implementation "com.github.xiaoymin:knife4j-gateway-spring-boot-starter"

    // Fixed: ClassNotFoundException: reactor.util.context.ContextView
    //implementation "io.projectreactor:reactor-core:3.5.4"

    implementation "org.springframework.cloud:spring-cloud-starter-gateway"
    implementation "org.springframework.cloud:spring-cloud-starter-loadbalancer"
    implementation "org.springframework.cloud:spring-cloud-starter-bootstrap"
    implementation "com.alibaba.cloud:spring-cloud-starter-alibaba-nacos-discovery"
    implementation "com.alibaba.cloud:spring-cloud-starter-alibaba-nacos-config"

    implementation "org.springframework.boot:spring-boot-starter-log4j2"
}

2.网关启动报错

ClassNotFoundException: reactor.util.context.ContextView

3.原因分析
最新的cn.dev33:sa-token-dependencies:1.38.0使用的reactor-core版本还是<reactor-core.version>3.1.4.RELEASE</reactor-core.version>，Spring Cloud Gateway 2022已经使用reactor-core 3.x，WebFlux框架高度依赖Reactor，建议保持和 Gateway Reactor版本同步。

< 备注：如果复现步骤比较复杂，请将 demo 上传到 gitee 并留下地址 >

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