Dubbo注册到zookeeper报错

╰半橙微兮° 2021-12-22 06:23 235阅读 0赞

最近在学习Dubbo的知识，就做一个入门小demo，但是一直报错，很懊恼。

本来是一个简单的客户端调用服务端的例子，但是一直访问不到。报错如下

严重: StandardWrapper.Throwable
    org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userController' defined in file [G:\idea_file\DubboxDemoWeb\target\classes\com\company\dubbox\controller\UserController.class]: Initialization of bean failed; nested exception is org.springframework.beans.factory.BeanInitializationException: Failed to init remote service reference at filed userService in class com.company.dubbox.controller.UserController; nested exception is java.lang.IllegalStateException: Failed to check the status of the service com.company.dubbox.service.UserService. No provider available for the service com.company.dubbox.service.UserService from the url zookeeper://127.0.0.1:2181/com.alibaba.dubbo.registry.RegistryService?application=DubboxDemoWeb&dubbo=2.8.4&interface=com.company.dubbox.service.UserService&methods=getName&pid=9280&side=consumer&timestamp=1561779657577 to the consumer 192.168.0.101 use dubbo version 2.8.4
    	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:553)
    	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)
    	at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
    	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
    	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
    	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
    	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:772)
    	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:839)
    	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:538)
    	at org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:668)
    	at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:634)
    	at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:682)
    	at org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:553)
    	at org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:494)
    	at org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:136)
    	at javax.servlet.GenericServlet.init(GenericServlet.java:160)

从报错可以看出来是spring没有办法通过反射创建UserService对象，但是为什么呢？明明已经注册了

--------------------

根据报错的信息去网上查询资料的时候，发现大多数网友的建议都是检查zookeeper的地址是否有错之类的，并不能解决。

然后根据自己的实际问题出发，重新梳理一遍问题。

--------------------

查看zookeeper的日志，发现一个报错，报错节点重复了

- INFO  [ProcessThread(sid:0 cport:-1)::PrepRequ
    estProcessor@645] - Got user-level KeeperException when processing sessionid:0x1
    6ba138baf40007 type:create cxid:0x10 zxid:0x63 txntype:-1 reqpath:n/a Error Path
    :/dubbo/com.company.dubbox.service.UserService Error:KeeperErrorCode = NodeExist
    s for /dubbo/com.company.dubbox.service.UserService

从报错信息可以看到有两个UserService，但是为什么呢？明明是写了一下

通过zookeeper的可视化工具来看，确实也是有两个，并且路径是不一样的，很奇怪

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3ljZzMz_size_16_color_FFFFFF_t_70][]

查看代码，发现了大坑

服务端

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3ljZzMz_size_16_color_FFFFFF_t_70 1][]

客户端

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3ljZzMz_size_16_color_FFFFFF_t_70 2][]

服务端UserService的路径写错了，应该是在service包下的

解决办法：修改服务端UserService的路径，然后重新启动

修改服务端UserService的路径

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3ljZzMz_size_16_color_FFFFFF_t_70 3][]

重启项目，访问正常

![20190629115827122.png][]

## 总结 ##

遇到问题的时候，需要弄清楚问题的根本原因，才容易解决问题。

比如对于这个问题，自己并没有想到是代码的路径写错了，可能是晚上困了【哈哈哈~】，看错了idea的目录树层级结构。然后就一直查看zookeeper的配置相关的内容。但是没有解决。第二天早上，重新梳理问题，查看zookeeper日志，找到了是因为重复注册了不同路径的UserService,然后就去查看自己代码，问题得以解决。

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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3ljZzMz_size_16_color_FFFFFF_t_70 1]: /images/20211220/273a67e9f183476083eb5e273d52795d.png
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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3ljZzMz_size_16_color_FFFFFF_t_70 3]: /images/20211220/63431b96afc84ea388063bc35991fae4.png
[20190629115827122.png]: /images/20211220/114a57bb992e4fcba5d223b62ac8fa4f.png