网关 升级 3.1.2报错

Question

网关依赖 3.1.2 报错，求解。

 <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-gateway</artifactId>
            <version>3.1.2 </version>
   </dependency>

<parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.10.RELEASE </version>
        <relativePath/> 
    </parent>

启动报错：

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'httpClientProperties' defined in class path resource [org/springframework/cloud/gateway/config/GatewayAutoConfiguration$NettyConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.cloud.gateway.config.HttpClientProperties]: Factory method 'httpClientProperties' threw exception; nested exception is java.lang.NoClassDefFoundError: reactor/netty/transport/ProxyProvider$Proxy
    at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:655) ~[spring-beans-5.2.9.RELEASE.jar:5.2.9.RELEASE]
    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:483) ~[spring-beans-5.2.9.RELEASE.jar:5.2.9.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1336) ~[spring-beans-5.2.9.RELEASE.jar:5.2.9.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1176) ~[spring-beans-5.2.9.RELEASE.jar:5.2.9.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:556) ~[spring-beans-5.2.9.RELEASE.jar:5.2.9.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:516) ~[spring-beans-5.2.9.RELEASE.jar:5.2.9.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:324) ~[spring-beans-5.2.9.RELEASE.jar:5.2.9.RELEASE]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.2.9.RELEASE.jar:5.2.9.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:322) ~[spring-beans-5.2.9.RELEASE.jar:5.2.9.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.9.RELEASE.jar:5.2.9.RELEASE]
    at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276) ~[spring-beans-5.2.9.RELEASE.jar:5.2.9.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1307) ~[spring-beans-5.2.9.RELEASE.jar:5.2.9.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1227) ~[spring-beans-5.2.9.RELEASE.jar:5.2.9.RELEASE]
    at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:884) ~[spring-beans-5.2.9.RELEASE.jar:5.2.9.RELEASE]
    at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:788) ~[spring-beans-5.2.9.RELEASE.jar:5.2.9.RELEASE]
    ... 19 common frames omitted
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.cloud.gateway.config.HttpClientProperties]: Factory method 'httpClientProperties' threw exception; nested exception is java.lang.NoClassDefFoundError: reactor/netty/transport/ProxyProvider$Proxy
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185) ~[spring-beans-5.2.9.RELEASE.jar:5.2.9.RELEASE]
    at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:650) ~[spring-beans-5.2.9.RELEASE.jar:5.2.9.RELEASE]
    ... 33 common frames omitted
Caused by: java.lang.NoClassDefFoundError: reactor/netty/transport/ProxyProvider$Proxy
    at org.springframework.cloud.gateway.config.HttpClientProperties$Proxy.<init>(HttpClientProperties.java:321) ~[spring-cloud-gateway-server-3.1.2.jar:3.1.2]
    at org.springframework.cloud.gateway.config.HttpClientProperties.<init>(HttpClientProperties.java:70) ~[spring-cloud-gateway-server-3.1.2.jar:3.1.2]
    at org.springframework.cloud.gateway.config.GatewayAutoConfiguration$NettyConfiguration.httpClientProperties(GatewayAutoConfiguration.java:667) ~[spring-cloud-gateway-server-3.1.2.jar:3.1.2]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_181]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_181]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_181]
    at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_181]
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154) ~[spring-beans-5.2.9.RELEASE.jar:5.2.9.RELEASE]
    ... 34 common frames omitted
Caused by: java.lang.ClassNotFoundException: reactor.netty.transport.ProxyProvider$Proxy
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381) ~[na:1.8.0_181]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[na:1.8.0_181]
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349) ~[na:1.8.0_181]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[na:1.8.0_181]
    ... 42 common frames omitted

Answer 1

报错应该是说：Spring找不到 org.springframework.cloud.gateway.config.HttpClientProperties 这个类
可以尝试一下是否能通过 @Bean 注入这个类，如果可以，那么看看注入这个类之后是否还会报这个错。
如果注入不了，那可能是还缺少另一个依赖项。

这是我的网关服务项目，可以参考
https://gitee.com/sticki/scblogs/tree/main/gateway-service