Spring-cloud EureKa部分与Spring-boot2.2.X版本不兼容问题

近期由于电脑重装了系统导致之前的东西都需要重新安装 

在安装 idea 时候 抛弃了2017  选择了2019最新版的idea  , 然后jdk 版本1.8  

心想先和也是闲着不如搭建个分布式项目玩玩 做点小功能 , 于是乎然后就有了如下场景

 

问题一 : Eureka 与springboot 较高版本不兼容问题  

1 . 创建SpringBoot  项目  然后作为Eureka 服务注册

笔者这里由于安装的新版本idea  , 然后Spring-boot 的版本为 2.2.6  ,划重点  2.2.6

项目创建好后 , 下一步需要做的就是引入    Spring-cloud  的相关 pom 文件 以及 springboot 整合eureka 的 pom文件

代码如下(注意Spring-boot 版本)可直接拷贝使用

    4.0.0
    
        org.springframework.boot
        spring-boot-starter-parent
         
        2.2.6.RELEASE
         
    
    com.hk
    microservice-eureka
    0.0.1-SNAPSHOT
    microservice-eureka
    Demo project for Spring Boot

    
        1.8
    
    
        
            
            
                org.springframework.cloud
                spring-cloud-dependencies
                Finchley.SR1
                pom
                import
            
        
    
    
        
            org.springframework.boot
            spring-boot-starter
        
        
        
            org.springframework.cloud
            spring-cloud-starter-netflix-eureka-server
        
        
            org.springframework.boot
            spring-boot-starter-test
            test
            
                
                    org.junit.vintage
                    junit-vintage-engine
                
            
        
    

    
        
            
                org.springframework.boot
                spring-boot-maven-plugin
            
        
    

2 . pom 文件整理好之后 , 在启动类加上注解  声明这是一个Eureka注册服务

@EnableEurekaServer

3 . 然后配置相应端口 以及  eureka 的一些相关注册配置 

由于eureka注册服务 , 本身也是个服务 , 所以直接去启动的话 , 它会向自己 注册自己 

所以在这里需要配置一下 register-with-eureka: false  是否将自己注册 , 默认是true  这里选择false

里面有提到 集群时候 可以为true , 原因是因为 , 在集群环境中 , 你不可能只有一个eureka 服务注册中心 , 所以说 还需要eureka之间相互注册 , 来确保服务的可用性.

server:
  port: 8200
spring:
  application:
    name: eureka
eureka:
  instance:
    hostname: 127.0.0.1 #注册中心地址
  client: #客户端调用地址
    serviceUrl:
      defaultZone: http://${eureka.instance.hostname}:8200/eureka/
    #是否将自己注册到Eureka服务中,因为该应用本身就是注册中心，不需要再注册自己（集群的时候为true）
    register-with-eureka: false
    #是否从Eureka中获取注册信息,因为自己为注册中心,不会在该应用中的检索服务信息
    fetch-registry: false

至此  Eureka 逐步搭建就结束了  , 然后可以试启动 ,  笔者出现如下报错信息 , 为了方便查看  索性全复制了 ..... 

报错信息就笔者认为 , 是模糊的  是不好定位问题的 (个人认为 :) )

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2020-04-13 12:58:05.422 ERROR 2844 --- [           main] o.s.boot.SpringApplication               : Application run failed

org.springframework.context.ApplicationContextException: Unable to start web server; nested exception is org.springframework.boot.web.server.WebServerException: Unable to start embedded Tomcat
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:156) ~[spring-boot-2.2.6.RELEASE.jar:2.2.6.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:544) ~[spring-context-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:141) ~[spring-boot-2.2.6.RELEASE.jar:2.2.6.RELEASE]
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:747) [spring-boot-2.2.6.RELEASE.jar:2.2.6.RELEASE]
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) [spring-boot-2.2.6.RELEASE.jar:2.2.6.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) [spring-boot-2.2.6.RELEASE.jar:2.2.6.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) [spring-boot-2.2.6.RELEASE.jar:2.2.6.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215) [spring-boot-2.2.6.RELEASE.jar:2.2.6.RELEASE]
	at com.hk.MicroserviceEureka2Application.main(MicroserviceEureka2Application.java:13) [classes/:na]
Caused by: org.springframework.boot.web.server.WebServerException: Unable to start embedded Tomcat
	at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.initialize(TomcatWebServer.java:126) ~[spring-boot-2.2.6.RELEASE.jar:2.2.6.RELEASE]
	at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.(TomcatWebServer.java:88) ~[spring-boot-2.2.6.RELEASE.jar:2.2.6.RELEASE]
	at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getTomcatWebServer(TomcatServletWebServerFactory.java:438) ~[spring-boot-2.2.6.RELEASE.jar:2.2.6.RELEASE]
	at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getWebServer(TomcatServletWebServerFactory.java:191) ~[spring-boot-2.2.6.RELEASE.jar:2.2.6.RELEASE]
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.createWebServer(ServletWebServerApplicationContext.java:180) ~[spring-boot-2.2.6.RELEASE.jar:2.2.6.RELEASE]
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:153) ~[spring-boot-2.2.6.RELEASE.jar:2.2.6.RELEASE]
	... 8 common frames omitted
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'traceFilterRegistration' defined in class path resource [org/springframework/cloud/netflix/eureka/server/EurekaServerAutoConfiguration.class]: Unsatisfied dependency expressed through method 'traceFilterRegistration' parameter 0; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'javax.servlet.Filter' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Qualifier(value=httpTraceFilter)}
	at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:798) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:539) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1338) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1177) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:557) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:323) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:207) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.boot.web.servlet.ServletContextInitializerBeans.getOrderedBeansOfType(ServletContextInitializerBeans.java:211) ~[spring-boot-2.2.6.RELEASE.jar:2.2.6.RELEASE]
	at org.springframework.boot.web.servlet.ServletContextInitializerBeans.getOrderedBeansOfType(ServletContextInitializerBeans.java:202) ~[spring-boot-2.2.6.RELEASE.jar:2.2.6.RELEASE]
	at org.springframework.boot.web.servlet.ServletContextInitializerBeans.addServletContextInitializerBeans(ServletContextInitializerBeans.java:96) ~[spring-boot-2.2.6.RELEASE.jar:2.2.6.RELEASE]
	at org.springframework.boot.web.servlet.ServletContextInitializerBeans.(ServletContextInitializerBeans.java:85) ~[spring-boot-2.2.6.RELEASE.jar:2.2.6.RELEASE]
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.getServletContextInitializerBeans(ServletWebServerApplicationContext.java:253) ~[spring-boot-2.2.6.RELEASE.jar:2.2.6.RELEASE]
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.selfInitialize(ServletWebServerApplicationContext.java:227) ~[spring-boot-2.2.6.RELEASE.jar:2.2.6.RELEASE]
	at org.springframework.boot.web.embedded.tomcat.TomcatStarter.onStartup(TomcatStarter.java:53) ~[spring-boot-2.2.6.RELEASE.jar:2.2.6.RELEASE]
	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5140) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1384) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1374) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
	at java.util.concurrent.FutureTask.run$$$capture(FutureTask.java:266) ~[na:1.8.0_101]
	at java.util.concurrent.FutureTask.run(FutureTask.java) ~[na:1.8.0_101]
	at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
	at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:134) ~[na:1.8.0_101]
	at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:909) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:841) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1384) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1374) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
	at java.util.concurrent.FutureTask.run$$$capture(FutureTask.java:266) ~[na:1.8.0_101]
	at java.util.concurrent.FutureTask.run(FutureTask.java) ~[na:1.8.0_101]
	at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
	at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:134) ~[na:1.8.0_101]
	at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:909) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:262) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.catalina.core.StandardService.startInternal(StandardService.java:421) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:930) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.catalina.startup.Tomcat.start(Tomcat.java:468) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.initialize(TomcatWebServer.java:107) ~[spring-boot-2.2.6.RELEASE.jar:2.2.6.RELEASE]
	... 13 common frames omitted
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'javax.servlet.Filter' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Qualifier(value=httpTraceFilter)}
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoMatchingBeanFound(DefaultListableBeanFactory.java:1700) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1256) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1210) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:885) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:789) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	... 55 common frames omitted

 既然出现了问题那就就去解决 , 首先笔者根据报错信息在网上搜了一大堆解决办法 , 后来发现要么是瞎写 ,

要么就是根据根据自己的项目版本   然后就断言 自己的是   "2.X.X  通用解决办法"  , 很是鸡肋 , 全然没用

 

最终笔者决定下调Springboot 版本  , 至于为什么决定下调版本  , 因为在Spring-bloud 官方文档上有提到 , euraka 与Spring 版本的一些具描述  ,  但描述信息旧  , 不适应最新版本 , 不过仍可作为问题原因参考 . 

于是乎就准备改下pom , 下调Spring-boot 版本  , 但也不想一下降太多 , 索性就试试 , 不得不说 , 笔者还是幸运的 ,  在第一次下调版本 , 便是下调至 2.0.6  ,  改完配置文件 , 清理下缓存 , 重启项目  ,直接成功 ,,,,,,,,,,   

 Started MicroserviceEurekaApplication in 10.773 seconds (JVM running for 12.446)

笔者心里也是莫名其妙.........  幸福来得太突然 ....   , 该问题描述 , 只是阐述笔者所遇到的问题 , 断然不敢以偏概全 , 妄下定论, 故,再出现问题时候 , 一定不要慌 , 先去看报错信息 , 然后搜索 , 如若仍旧没结果  , 可尝试 阅读官方文档 . 或求助于他人 , 以免浪费不必要的时间 , 做无用功!!!!