Failed to start bean ‘nacosWatch‘；ErrCode:-400, ErrMsg:Could not initialize class com.alibaba.nacos.

今天学习 nacos 的时候出现了一个错误, jar 包依赖冲突, 用的 cloud 和 springboot 的版本较高, 记录一下解决问题的全过程
这是父工程的依赖

    <properties>
        <ruoyi.version>3.6.1ruoyi.version>
        <project.build.sourceEncoding>UTF-8project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8project.reporting.outputEncoding>
        <java.version>1.8java.version>
        <spring-boot.version>2.7.3spring-boot.version>
        <spring-cloud.version>2021.0.4spring-cloud.version>
        <spring-cloud-alibaba.version>2021.0.4.0spring-cloud-alibaba.version>
        <spring-boot-admin.version>2.7.5spring-boot-admin.version>
        <spring-boot.mybatis>2.2.2spring-boot.mybatis>
        <swagger.fox.version>3.0.0swagger.fox.version>
        <swagger.core.version>1.6.2swagger.core.version>
        <tobato.version>1.27.2tobato.version>
        <kaptcha.version>2.3.2kaptcha.version>
        <pagehelper.boot.version>1.4.5pagehelper.boot.version>
        <druid.version>1.2.12druid.version>
        <dynamic-ds.version>3.5.2dynamic-ds.version>
        <commons.io.version>2.11.0commons.io.version>
        <commons.fileupload.version>1.4commons.fileupload.version>
        <velocity.version>2.3velocity.version>
        <fastjson.version>2.0.14fastjson.version>
        <jjwt.version>0.9.1jjwt.version>
        <minio.version>8.2.2minio.version>
        <poi.version>4.1.2poi.version>
        <commons-collections.version>3.2.2commons-collections.version>
        <transmittable-thread-local.version>2.13.2transmittable-thread-local.version>
        <lombok.version>1.18.4lombok.version>
    properties>
    
    <dependencyManagement>
        <dependencies>

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

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

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

            
            <dependency>
                <groupId>com.github.tobatogroupId>
                <artifactId>fastdfs-clientartifactId>
                <version>${tobato.version}version>
            dependency>

            
            <dependency>
                <groupId>org.mybatis.spring.bootgroupId>
                <artifactId>mybatis-spring-boot-starterartifactId>
                <version>${spring-boot.mybatis}version>
            dependency>

            
            <dependency>
                <groupId>io.swaggergroupId>
                <artifactId>swagger-modelsartifactId>
                <version>${swagger.core.version}version>
            dependency>
            <dependency>
                <groupId>io.swaggergroupId>
                <artifactId>swagger-annotationsartifactId>
                <version>${swagger.core.version}version>
            dependency>

            
            <dependency>
                <groupId>com.github.pengglegroupId>
                <artifactId>kaptchaartifactId>
                <version>${kaptcha.version}version>
            dependency>

            
            <dependency>
                <groupId>com.github.pagehelpergroupId>
                <artifactId>pagehelper-spring-boot-starterartifactId>
                <version>${pagehelper.boot.version}version>
            dependency>

            
            <dependency>
                <groupId>commons-iogroupId>
                <artifactId>commons-ioartifactId>
                <version>${commons.io.version}version>
            dependency>

            
            <dependency>
                <groupId>org.apache.poigroupId>
                <artifactId>poi-ooxmlartifactId>
                <version>${poi.version}version>
            dependency>

            
            <dependency>
                <groupId>commons-fileuploadgroupId>
                <artifactId>commons-fileuploadartifactId>
                <version>${commons.fileupload.version}version>
            dependency>

            
            <dependency>
                <groupId>org.apache.velocitygroupId>
                <artifactId>velocity-engine-coreartifactId>
                <version>${velocity.version}version>
            dependency>

            
            <dependency>
                <groupId>commons-collectionsgroupId>
                <artifactId>commons-collectionsartifactId>
                <version>${commons-collections.version}version>
            dependency>

            
            <dependency>
                <groupId>com.alibaba.fastjson2groupId>
                <artifactId>fastjson2artifactId>
                <version>${fastjson.version}version>
            dependency>

            
            <dependency>
                <groupId>io.jsonwebtokengroupId>
                <artifactId>jjwtartifactId>
                <version>${jjwt.version}version>
            dependency>

            
            <dependency>
                <groupId>com.alibabagroupId>
                <artifactId>transmittable-thread-localartifactId>
                <version>${transmittable-thread-local.version}version>
            dependency>






            <dependency>
                <groupId>org.projectlombokgroupId>
                <artifactId>lombokartifactId>
                <version>${lombok.version}version>
                <scope>providedscope>
            dependency>
        dependencies>
    dependencyManagement>

    <dependencies>
        
        <dependency>
            <groupId>org.springframework.cloudgroupId>
            <artifactId>spring-cloud-starter-bootstrapartifactId>
        dependency>
    dependencies>

文章比较长, 先把结论写出来, 加入依赖, 和配置

        <dependency>
            <groupId>org.springframework.cloudgroupId>
            <artifactId>spring-cloud-starter-bootstrapartifactId>
        dependency>

spring.cloud.loadbalancer.ribbon.enabled=false
spring.cloud.loadbalancer.nacos.enabled=true

这是子工程的依赖, 子工程是按照 nacos 官网 example 来的

    <properties>
        <maven.compiler.source>8maven.compiler.source>
        <maven.compiler.target>8maven.compiler.target>
    properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-webartifactId>
        dependency>
        <dependency>
            <groupId>org.springframework.cloudgroupId>
            <artifactId>spring-cloud-starter-netflix-ribbonartifactId>
            <version>2.2.7.RELEASEversion>






        dependency>

        <dependency>
            <groupId>org.springframework.cloudgroupId>
            <artifactId>spring-cloud-starter-openfeignartifactId>
        dependency>
        <dependency>
            <groupId>com.alibaba.cloudgroupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discoveryartifactId>
            <exclusions>
                <exclusion>
                    <groupId>com.alibaba.nacosgroupId>
                    <artifactId>nacos-clientartifactId>
                exclusion>
            exclusions>
        dependency>
        <dependency>
            <groupId>com.alibaba.nacosgroupId>
            <artifactId>nacos-clientartifactId>
        dependency>
    dependencies>

然后这是通过 idea 的 maven diagram 功能显示的依赖图

nacos server 的版本是2.1.1
通过报错和依赖冲突大致猜测是 guava 的版本问题
尝试 nacos-client 里或 netfilx-ribbon 里去掉 guava 依赖
最后发现去掉 ribbon 里的启动成功了
这是启动类

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.context.annotation.Bean;
import org.springframework.web.client.RestTemplate;

@SpringBootApplication
@EnableDiscoveryClient
public class NacosConsumerApplication {
    @LoadBalanced
    @Bean
    public RestTemplate restTemplate() {
        return new RestTemplate();
    }
    public static void main(String[] args) {
        SpringApplication.run(NacosConsumerApplication.class, args);
    }
}

这是启动报错

java.lang.RuntimeException: ErrCode:-400, ErrMsg:Could not initialize class com.alibaba.nacos.common.remote.client.grpc.GrpcSdkClient
	at com.alibaba.cloud.nacos.NacosServiceManager.createNewNamingService(NacosServiceManager.java:102) ~[spring-cloud-starter-alibaba-nacos-discovery-2021.0.4.0.jar:2021.0.4.0]
	at com.alibaba.cloud.nacos.NacosServiceManager.buildNamingService(NacosServiceManager.java:90) ~[spring-cloud-starter-alibaba-nacos-discovery-2021.0.4.0.jar:2021.0.4.0]
	at com.alibaba.cloud.nacos.NacosServiceManager.getNamingService(NacosServiceManager.java:46) ~[spring-cloud-starter-alibaba-nacos-discovery-2021.0.4.0.jar:2021.0.4.0]
	at com.alibaba.cloud.nacos.discovery.NacosWatch.stop(NacosWatch.java:173) [spring-cloud-starter-alibaba-nacos-discovery-2021.0.4.0.jar:2021.0.4.0]
	at com.alibaba.cloud.nacos.discovery.NacosWatch.destroy(NacosWatch.java:204) [spring-cloud-starter-alibaba-nacos-discovery-2021.0.4.0.jar:2021.0.4.0]
	at org.springframework.beans.factory.support.DisposableBeanAdapter.destroy(DisposableBeanAdapter.java:213) [spring-beans-5.3.22.jar:5.3.22]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroyBean(DefaultSingletonBeanRegistry.java:587) [spring-beans-5.3.22.jar:5.3.22]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroySingleton(DefaultSingletonBeanRegistry.java:559) [spring-beans-5.3.22.jar:5.3.22]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.destroySingleton(DefaultListableBeanFactory.java:1163) [spring-beans-5.3.22.jar:5.3.22]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroySingletons(DefaultSingletonBeanRegistry.java:520) [spring-beans-5.3.22.jar:5.3.22]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.destroySingletons(DefaultListableBeanFactory.java:1156) [spring-beans-5.3.22.jar:5.3.22]
	at org.springframework.context.support.AbstractApplicationContext.destroyBeans(AbstractApplicationContext.java:1106) [spring-context-5.3.22.jar:5.3.22]
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:596) [spring-context-5.3.22.jar:5.3.22]
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:147) [spring-boot-2.7.3.jar:2.7.3]
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:734) [spring-boot-2.7.3.jar:2.7.3]
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:408) [spring-boot-2.7.3.jar:2.7.3]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:308) [spring-boot-2.7.3.jar:2.7.3]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1306) [spring-boot-2.7.3.jar:2.7.3]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1295) [spring-boot-2.7.3.jar:2.7.3]
	at com.study.ming.NacosConsumerApplication.main(NacosConsumerApplication.java:23) [classes/:na]
Caused by: com.alibaba.nacos.api.exception.NacosException: java.lang.reflect.InvocationTargetException
	at com.alibaba.nacos.api.naming.NamingFactory.createNamingService(NamingFactory.java:61) ~[nacos-client-2.0.4.jar:na]
	at com.alibaba.nacos.api.NacosFactory.createNamingService(NacosFactory.java:77) ~[nacos-client-2.0.4.jar:na]
	at com.alibaba.cloud.nacos.NacosServiceManager.createNewNamingService(NacosServiceManager.java:99) ~[spring-cloud-starter-alibaba-nacos-discovery-2021.0.4.0.jar:2021.0.4.0]
	... 19 common frames omitted
Caused by: java.lang.reflect.InvocationTargetException: null
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:1.8.0_181]
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[na:1.8.0_181]
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:1.8.0_181]
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[na:1.8.0_181]
	at com.alibaba.nacos.api.naming.NamingFactory.createNamingService(NamingFactory.java:59) ~[nacos-client-2.0.4.jar:na]
	... 21 common frames omitted
Caused by: java.lang.NoClassDefFoundError: Could not initialize class com.alibaba.nacos.common.remote.client.grpc.GrpcSdkClient
	at com.alibaba.nacos.common.remote.client.RpcClientFactory.lambda$createClient$0(RpcClientFactory.java:81) ~[nacos-client-2.0.4.jar:na]
	at java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1660) ~[na:1.8.0_181]
	at com.alibaba.nacos.common.remote.client.RpcClientFactory.createClient(RpcClientFactory.java:79) ~[nacos-client-2.0.4.jar:na]
	at com.alibaba.nacos.client.naming.remote.gprc.NamingGrpcClientProxy.<init>(NamingGrpcClientProxy.java:87) ~[nacos-client-2.0.4.jar:na]
	at com.alibaba.nacos.client.naming.remote.NamingClientProxyDelegate.<init>(NamingClientProxyDelegate.java:76) ~[nacos-client-2.0.4.jar:na]
	at com.alibaba.nacos.client.naming.NacosNamingService.init(NacosNamingService.java:95) ~[nacos-client-2.0.4.jar:na]
	at com.alibaba.nacos.client.naming.NacosNamingService.<init>(NacosNamingService.java:81) ~[nacos-client-2.0.4.jar:na]
	... 26 common frames omitted

2022-10-27 11:20:32.847  INFO 12908 --- [           main] o.apache.catalina.core.StandardService   : Stopping service [Tomcat]
2022-10-27 11:20:32.856  INFO 12908 --- [           main] ConditionEvaluationReportLoggingListener : 

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2022-10-27 11:20:32.880 ERROR 12908 --- [           main] o.s.boot.SpringApplication               : Application run failed

org.springframework.context.ApplicationContextException: Failed to start bean 'nacosWatch'; nested exception is java.lang.RuntimeException: ErrCode:-400, ErrMsg:com.google.common.collect.Sets$SetView.iterator()Lcom/google/common/collect/UnmodifiableIterator;
	at org.springframework.context.support.DefaultLifecycleProcessor.doStart(DefaultLifecycleProcessor.java:181) ~[spring-context-5.3.22.jar:5.3.22]
	at org.springframework.context.support.DefaultLifecycleProcessor.access$200(DefaultLifecycleProcessor.java:54) ~[spring-context-5.3.22.jar:5.3.22]
	at org.springframework.context.support.DefaultLifecycleProcessor$LifecycleGroup.start(DefaultLifecycleProcessor.java:356) ~[spring-context-5.3.22.jar:5.3.22]
	at java.lang.Iterable.forEach(Iterable.java:75) ~[na:1.8.0_181]
	at org.springframework.context.support.DefaultLifecycleProcessor.startBeans(DefaultLifecycleProcessor.java:155) ~[spring-context-5.3.22.jar:5.3.22]
	at org.springframework.context.support.DefaultLifecycleProcessor.onRefresh(DefaultLifecycleProcessor.java:123) ~[spring-context-5.3.22.jar:5.3.22]
	at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:935) ~[spring-context-5.3.22.jar:5.3.22]
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:586) ~[spring-context-5.3.22.jar:5.3.22]
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:147) ~[spring-boot-2.7.3.jar:2.7.3]
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:734) [spring-boot-2.7.3.jar:2.7.3]
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:408) [spring-boot-2.7.3.jar:2.7.3]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:308) [spring-boot-2.7.3.jar:2.7.3]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1306) [spring-boot-2.7.3.jar:2.7.3]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1295) [spring-boot-2.7.3.jar:2.7.3]
	at com.study.ming.NacosConsumerApplication.main(NacosConsumerApplication.java:23) [classes/:na]
Caused by: java.lang.RuntimeException: ErrCode:-400, ErrMsg:com.google.common.collect.Sets$SetView.iterator()Lcom/google/common/collect/UnmodifiableIterator;
	at com.alibaba.cloud.nacos.NacosServiceManager.createNewNamingService(NacosServiceManager.java:102) ~[spring-cloud-starter-alibaba-nacos-discovery-2021.0.4.0.jar:2021.0.4.0]
	at com.alibaba.cloud.nacos.NacosServiceManager.buildNamingService(NacosServiceManager.java:90) ~[spring-cloud-starter-alibaba-nacos-discovery-2021.0.4.0.jar:2021.0.4.0]
	at com.alibaba.cloud.nacos.NacosServiceManager.getNamingService(NacosServiceManager.java:46) ~[spring-cloud-starter-alibaba-nacos-discovery-2021.0.4.0.jar:2021.0.4.0]
	at com.alibaba.cloud.nacos.discovery.NacosWatch.start(NacosWatch.java:130) ~[spring-cloud-starter-alibaba-nacos-discovery-2021.0.4.0.jar:2021.0.4.0]
	at org.springframework.context.support.DefaultLifecycleProcessor.doStart(DefaultLifecycleProcessor.java:178) ~[spring-context-5.3.22.jar:5.3.22]
	... 14 common frames omitted
Caused by: com.alibaba.nacos.api.exception.NacosException: java.lang.reflect.InvocationTargetException
	at com.alibaba.nacos.api.naming.NamingFactory.createNamingService(NamingFactory.java:61) ~[nacos-client-2.0.4.jar:na]
	at com.alibaba.nacos.api.NacosFactory.createNamingService(NacosFactory.java:77) ~[nacos-client-2.0.4.jar:na]
	at com.alibaba.cloud.nacos.NacosServiceManager.createNewNamingService(NacosServiceManager.java:99) ~[spring-cloud-starter-alibaba-nacos-discovery-2021.0.4.0.jar:2021.0.4.0]
	... 18 common frames omitted
Caused by: java.lang.reflect.InvocationTargetException: null
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:1.8.0_181]
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[na:1.8.0_181]
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:1.8.0_181]
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[na:1.8.0_181]
	at com.alibaba.nacos.api.naming.NamingFactory.createNamingService(NamingFactory.java:59) ~[nacos-client-2.0.4.jar:na]
	... 20 common frames omitted
Caused by: java.lang.NoSuchMethodError: com.google.common.collect.Sets$SetView.iterator()Lcom/google/common/collect/UnmodifiableIterator;
	at org.reflections.Reflections.expandSuperTypes(Reflections.java:380) ~[reflections-0.9.11.jar:na]
	at org.reflections.Reflections.<init>(Reflections.java:126) ~[reflections-0.9.11.jar:na]
	at org.reflections.Reflections.<init>(Reflections.java:168) ~[reflections-0.9.11.jar:na]
	at org.reflections.Reflections.<init>(Reflections.java:141) ~[reflections-0.9.11.jar:na]
	at com.alibaba.nacos.api.remote.PayloadRegistry.scan(PayloadRegistry.java:56) ~[nacos-client-2.0.4.jar:na]
	at com.alibaba.nacos.api.remote.PayloadRegistry.init(PayloadRegistry.java:44) ~[nacos-client-2.0.4.jar:na]
	at com.alibaba.nacos.common.remote.client.RpcClient.<clinit>(RpcClient.java:114) ~[nacos-client-2.0.4.jar:na]
	at com.alibaba.nacos.common.remote.client.RpcClientFactory.lambda$createClient$0(RpcClientFactory.java:81) ~[nacos-client-2.0.4.jar:na]
	at java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1660) ~[na:1.8.0_181]
	at com.alibaba.nacos.common.remote.client.RpcClientFactory.createClient(RpcClientFactory.java:79) ~[nacos-client-2.0.4.jar:na]
	at com.alibaba.nacos.client.naming.remote.gprc.NamingGrpcClientProxy.<init>(NamingGrpcClientProxy.java:87) ~[nacos-client-2.0.4.jar:na]
	at com.alibaba.nacos.client.naming.remote.NamingClientProxyDelegate.<init>(NamingClientProxyDelegate.java:76) ~[nacos-client-2.0.4.jar:na]
	at com.alibaba.nacos.client.naming.NacosNamingService.init(NacosNamingService.java:95) ~[nacos-client-2.0.4.jar:na]
	at com.alibaba.nacos.client.naming.NacosNamingService.<init>(NacosNamingService.java:81) ~[nacos-client-2.0.4.jar:na]
	... 25 common frames omitted

2022-10-27 11:20:32.881  WARN 12908 --- [      Thread-15] c.a.n.common.http.HttpClientBeanHolder   : [HttpClientBeanHolder] Start destroying common HttpClient
2022-10-27 11:20:32.881  WARN 12908 --- [      Thread-12] c.a.nacos.common.notify.NotifyCenter     : [NotifyCenter] Start destroying Publisher

Process finished with exit code 1

解决方法,去掉 ribbon 里的 guava 依赖

        ...
        <dependency>
            <groupId>org.springframework.cloudgroupId>
            <artifactId>spring-cloud-starter-netflix-ribbonartifactId>
            <version>2.2.7.RELEASEversion>
            <exclusions>
                <exclusion>
                    <groupId>com.google.guavagroupId>
                    <artifactId>guavaartifactId>
                exclusion>
            exclusions>
        dependency>
        ...

有一个问题, 这个依赖是干啥的呢?

        <dependency>
            <groupId>com.alibaba.nacosgroupId>
            <artifactId>nacos-clientartifactId>
        dependency>

nacos 官网文档里没说要倒入这个依赖啊, 但是 example 里需要这个依赖, 有人知道吗?

一波未平,一波又起

刚解决了不能启动的问题, 现在又出现 instance 无法访问的 bug

consumer 工程里的 HelloController 无法通过 ip 地址和服务名访问服务提供者 (provider工程), 搞了一下午, 头痛欲裂, 看来 nacos 还是不太成熟啊, 个人觉得应该是 cloud 和 ailibaba cloud 版本太高导致, 有没有人想尝试解决这个bug呢
[email protected]:hashtables/study_project.git 版本是这个tag nacos-bug2

一会尝试一下用 feign 调用接口, 现实中大家都是 feign 调用接口的, 很少使用 resttemplate 按服务名调用
接着肝…

仓库地址： [email protected]:hashtables/study_project.git

大家可以下载复现这个bug

搞鬼啊, 兄弟们, feign 也调不通啊, 代码仓库 tag: feign也调不通, 提交注释是 feign也调不通
有没有大神想挑战一下, 深入了解下 ribbon feign 内部原理呢, 这个bug 搞了一天了
为啥我这个 nacos 始终搞不好
这个是详细报错

2022-10-27 17:14:28.289 ERROR 24200 --- [nio-8082-exec-1] o.a.c.c.C.[.[.[/].[dispatcherServlet]    : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Handler dispatch failed; nested exception is java.lang.AbstractMethodError: org.springframework.cloud.netflix.ribbon.RibbonLoadBalancerClient.choose(Ljava/lang/String;Lorg/springframework/cloud/client/loadbalancer/Request;)Lorg/springframework/cloud/client/ServiceInstance;] with root cause

java.lang.AbstractMethodError: org.springframework.cloud.netflix.ribbon.RibbonLoadBalancerClient.choose(Ljava/lang/String;Lorg/springframework/cloud/client/loadbalancer/Request;)Lorg/springframework/cloud/client/ServiceInstance;
	at org.springframework.cloud.openfeign.loadbalancer.FeignBlockingLoadBalancerClient.execute(FeignBlockingLoadBalancerClient.java:97) ~[spring-cloud-openfeign-core-3.1.4.jar:3.1.4]
	at feign.SynchronousMethodHandler.executeAndDecode(SynchronousMethodHandler.java:119) ~[feign-core-11.8.jar:na]
	at feign.SynchronousMethodHandler.invoke(SynchronousMethodHandler.java:89) ~[feign-core-11.8.jar:na]
	at feign.ReflectiveFeign$FeignInvocationHandler.invoke(ReflectiveFeign.java:100) ~[feign-core-11.8.jar:na]
	at com.sun.proxy.$Proxy97.echo(Unknown Source) ~[na:na]
	at com.study.ming.controller.HelloController.echo(HelloController.java:44) ~[classes/:na]
	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.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205) ~[spring-web-5.3.22.jar:5.3.22]
	at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:150) ~[spring-web-5.3.22.jar:5.3.22]
	at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:117) ~[spring-webmvc-5.3.22.jar:5.3.22]
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:895) ~[spring-webmvc-5.3.22.jar:5.3.22]
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:808) ~[spring-webmvc-5.3.22.jar:5.3.22]
	at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.3.22.jar:5.3.22]
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1070) ~[spring-webmvc-5.3.22.jar:5.3.22]
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:963) ~[spring-webmvc-5.3.22.jar:5.3.22]
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.3.22.jar:5.3.22]
	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898) ~[spring-webmvc-5.3.22.jar:5.3.22]
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:655) ~[tomcat-embed-core-9.0.65.jar:4.0.FR]
	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.3.22.jar:5.3.22]
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:764) ~[tomcat-embed-core-9.0.65.jar:4.0.FR]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:227) ~[tomcat-embed-core-9.0.65.jar:9.0.65]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.65.jar:9.0.65]
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.65.jar:9.0.65]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.65.jar:9.0.65]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.65.jar:9.0.65]
	at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.3.22.jar:5.3.22]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.22.jar:5.3.22]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.65.jar:9.0.65]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.65.jar:9.0.65]
	at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.3.22.jar:5.3.22]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.22.jar:5.3.22]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.65.jar:9.0.65]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.65.jar:9.0.65]
	at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.doFilterInternal(WebMvcMetricsFilter.java:96) ~[spring-boot-actuator-2.7.3.jar:2.7.3]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.22.jar:5.3.22]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.65.jar:9.0.65]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.65.jar:9.0.65]
	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.3.22.jar:5.3.22]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.22.jar:5.3.22]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.65.jar:9.0.65]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.65.jar:9.0.65]
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:197) ~[tomcat-embed-core-9.0.65.jar:9.0.65]
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97) [tomcat-embed-core-9.0.65.jar:9.0.65]
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541) [tomcat-embed-core-9.0.65.jar:9.0.65]
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:135) [tomcat-embed-core-9.0.65.jar:9.0.65]
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) [tomcat-embed-core-9.0.65.jar:9.0.65]
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78) [tomcat-embed-core-9.0.65.jar:9.0.65]
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:360) [tomcat-embed-core-9.0.65.jar:9.0.65]
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:399) [tomcat-embed-core-9.0.65.jar:9.0.65]
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) [tomcat-embed-core-9.0.65.jar:9.0.65]
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:890) [tomcat-embed-core-9.0.65.jar:9.0.65]
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1789) [tomcat-embed-core-9.0.65.jar:9.0.65]
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-9.0.65.jar:9.0.65]
	at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191) [tomcat-embed-core-9.0.65.jar:9.0.65]
	at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) [tomcat-embed-core-9.0.65.jar:9.0.65]
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-9.0.65.jar:9.0.65]
	at java.lang.Thread.run(Thread.java:748) [na:1.8.0_181]

2022-10-27 17:14:28.773  INFO 24200 --- [ent-executor-44] com.alibaba.nacos.common.remote.client   : [110166af-3fe6-4d8d-b8f6-facc6a2fe601] Receive server push request, request = NotifySubscriberRequest, requestId = 42
2022-10-27 17:14:28.773  INFO 24200 --- [ent-executor-44] com.alibaba.nacos.common.remote.client   : [110166af-3fe6-4d8d-b8f6-facc6a2fe601] Ack server push request, request = NotifySubscriberRequest, requestId = 42

沃妮马, 老子试出来了, 我吧 loadbalancer, ribbon, openfeign 的版本从3.xx(从cloud dependency 继承过来的), 降到 2.2.9 RELEASE, 然后加了一个 比较关键的配置

spring.cloud.loadbalancer.ribbon.enabled=false
spring.cloud.loadbalancer.nacos.enabled=true

神奇般的好了, 代码版本 tag: 沃妮马, 老子试出来了

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本着科学严谨的态度, 使用控制变量法, 上一把应该是两个动作然后好使了, 现在将 loadbalancer, ribbon, openfeign 的版本还原, 看是版本的问题还是那个配置的问题
于是报了这么一个错误
Param ‘serviceName‘ is illegal, serviceName is blank
然后又加了一步, 加了bootstrap的依赖, 神奇般的好了, 非常的舒适

        <dependency>
            <groupId>org.springframework.cloudgroupId>
            <artifactId>spring-cloud-starter-bootstrapartifactId>
        dependency>

对应代码tag: 沃妮马, 老子试出来了2

---

继续上一步的控制变量法, 注释 那两个配置
#spring.cloud.loadbalancer.ribbon.enabled=false
#spring.cloud.loadbalancer.nacos.enabled=true
然后又不好使了, 报错:

这两个配置的字面意思是
禁用 ribbon 的负载均衡, 启用 nacos 的负载均衡, ??? 难道nacos也有负载均衡??? 为什么注释之后会报错??? 是时候了解一下 ribbon nacos 还有注册中心的内部原理了
顺便说一下, 这个配置是从官方文档里找到的, 在章节3.5.1, 看了看文档, 抱着试一试的态度,发现加了配置后就好使了