关于连接zookeeper的相关bug_caused by: java.lang.illegalstateexception: zookee

连接zookeeper相关bug

近日将ssm学完过后，需要进一步学习dubbo以及其所需要的注册中心zookeeper。但是在写入门案例时，遇到了bug，内容如下：

Caused by: java.lang.IllegalStateException: zookeeper not connected
	at org.apache.dubbo.remoting.zookeeper.curator.CuratorZookeeperClient.<init>(CuratorZookeeperClient.java:83)
	at org.apache.dubbo.remoting.zookeeper.curator.CuratorZookeeperTransporter.createZookeeperClient(CuratorZookeeperTransporter.java:26)
	at org.apache.dubbo.remoting.zookeeper.support.AbstractZookeeperTransporter.connect(AbstractZookeeperTransporter.java:68)
	at org.apache.dubbo.remoting.zookeeper.ZookeeperTransporter$Adaptive.connect(ZookeeperTransporter$Adaptive.java)
	at org.apache.dubbo.configcenter.support.zookeeper.ZookeeperDynamicConfiguration.<init>(ZookeeperDynamicConfiguration.java:62)
	at org.apache.dubbo.configcenter.support.zookeeper.ZookeeperDynamicConfigurationFactory.createDynamicConfiguration(ZookeeperDynamicConfigurationFactory.java:37)
	at org.apache.dubbo.configcenter.AbstractDynamicConfigurationFactory.getDynamicConfiguration(AbstractDynamicConfigurationFactory.java:33)
	at org.apache.dubbo.config.AbstractInterfaceConfig.getDynamicConfiguration(AbstractInterfaceConfig.java:315)
	at org.apache.dubbo.config.AbstractInterfaceConfig.prepareEnvironment(AbstractInterfaceConfig.java:290)
	at org.apache.dubbo.config.AbstractInterfaceConfig.startConfigCenter(AbstractInterfaceConfig.java:280)
	at org.apache.dubbo.config.AbstractInterfaceConfig.lambda$null$7(AbstractInterfaceConfig.java:636)
	at java.util.Optional.orElseGet(Optional.java:267)
	at org.apache.dubbo.config.AbstractInterfaceConfig.lambda$useRegistryForConfigIfNecessary$8(AbstractInterfaceConfig.java:620)
	at java.util.Optional.ifPresent(Optional.java:159)
	at org.apache.dubbo.config.AbstractInterfaceConfig.useRegistryForConfigIfNecessary(AbstractInterfaceConfig.java:618)
	at org.apache.dubbo.config.AbstractInterfaceConfig.checkRegistry(AbstractInterfaceConfig.java:208)
	at org.apache.dubbo.config.ReferenceConfig.createProxy(ReferenceConfig.java:378)
	at org.apache.dubbo.config.ReferenceConfig.init(ReferenceConfig.java:329)
	at org.apache.dubbo.config.ReferenceConfig.get(ReferenceConfig.java:250)
	at org.apache.dubbo.config.spring.beans.factory.annotation.ReferenceAnnotationBeanPostProcessor.getOrCreateProxy(ReferenceAnnotationBeanPostProcessor.java:246)
	at org.apache.dubbo.config.spring.beans.factory.annotation.ReferenceAnnotationBeanPostProcessor.doGetInjectedBean(ReferenceAnnotationBeanPostProcessor.java:143)
	at org.apache.dubbo.config.spring.beans.factory.annotation.AnnotationInjectedBeanPostProcessor.getInjectedObject(AnnotationInjectedBeanPostProcessor.java:359)
	at org.apache.dubbo.config.spring.beans.factory.annotation.AnnotationInjectedBeanPostProcessor$AnnotatedFieldElement.inject(AnnotationInjectedBeanPostProcessor.java:539)
	at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:90)
	at org.apache.dubbo.config.spring.beans.factory.annotation.AnnotationInjectedBeanPostProcessor.postProcessPropertyValues(AnnotationInjectedBeanPostProcessor.java:146)
	... 34 more
Caused by: java.lang.IllegalStateException: zookeeper not connected
	at org.apache.dubbo.remoting.zookeeper.curator.CuratorZookeeperClient.<init>(CuratorZookeeperClient.java:80)
	... 58 more

九月 21, 2021 10:14:54 上午 org.apache.catalina.core.StandardWrapperValve invoke
严重: Allocate exception for servlet springmvc
java.lang.IllegalStateException: zookeeper not connected
	at org.apache.dubbo.remoting.zookeeper.curator.CuratorZookeeperClient.<init>(CuratorZookeeperClient.java:80)
	at org.apache.dubbo.remoting.zookeeper.curator.CuratorZookeeperTransporter.createZookeeperClient(CuratorZookeeperTransporter.java:26)
	at org.apache.dubbo.remoting.zookeeper.support.AbstractZookeeperTransporter.connect(AbstractZookeeperTransporter.java:68)
	at org.apache.dubbo.remoting.zookeeper.ZookeeperTransporter$Adaptive.connect(ZookeeperTransporter$Adaptive.java)
	at org.apache.dubbo.configcenter.support.zookeeper.ZookeeperDynamicConfiguration.<init>(ZookeeperDynamicConfiguration.java:62)
	at org.apache.dubbo.configcenter.support.zookeeper.ZookeeperDynamicConfigurationFactory.createDynamicConfiguration(ZookeeperDynamicConfigurationFactory.java:37)
	at org.apache.dubbo.configcenter.AbstractDynamicConfigurationFactory.getDynamicConfiguration(AbstractDynamicConfigurationFactory.java:33)
	at org.apache.dubbo.config.AbstractInterfaceConfig.getDynamicConfiguration(AbstractInterfaceConfig.java:315)
	at org.apache.dubbo.config.AbstractInterfaceConfig.prepareEnvironment(AbstractInterfaceConfig.java:290)
	at org.apache.dubbo.config.AbstractInterfaceConfig.startConfigCenter(AbstractInterfaceConfig.java:280)
	at org.apache.dubbo.config.AbstractInterfaceConfig.lambda$null$7(AbstractInterfaceConfig.java:636)
	at java.util.Optional.orElseGet(Optional.java:267)
	at org.apache.dubbo.config.AbstractInterfaceConfig.lambda$useRegistryForConfigIfNecessary$8(AbstractInterfaceConfig.java:620)
	at java.util.Optional.ifPresent(Optional.java:159)
	at org.apache.dubbo.config.AbstractInterfaceConfig.useRegistryForConfigIfNecessary(AbstractInterfaceConfig.java:618)
	at org.apache.dubbo.config.AbstractInterfaceConfig.checkRegistry(AbstractInterfaceConfig.java:208)
	at org.apache.dubbo.config.ReferenceConfig.createProxy(ReferenceConfig.java:378)
	at org.apache.dubbo.config.ReferenceConfig.init(ReferenceConfig.java:329)
	at org.apache.dubbo.config.ReferenceConfig.get(ReferenceConfig.java:250)
	at org.apache.dubbo.config.spring.beans.factory.annotation.ReferenceAnnotationBeanPostProcessor.getOrCreateProxy(ReferenceAnnotationBeanPostProcessor.java:246)
	at org.apache.dubbo.config.spring.beans.factory.annotation.ReferenceAnnotationBeanPostProcessor.doGetInjectedBean(ReferenceAnnotationBeanPostProcessor.java:143)
	at org.apache.dubbo.config.spring.beans.factory.annotation.AnnotationInjectedBeanPostProcessor.getInjectedObject(AnnotationInjectedBeanPostProcessor.java:359)
	at org.apache.dubbo.config.spring.beans.factory.annotation.AnnotationInjectedBeanPostProcessor$AnnotatedFieldElement.inject(AnnotationInjectedBeanPostProcessor.java:539)
	at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:90)
	at org.apache.dubbo.config.spring.beans.factory.annotation.AnnotationInjectedBeanPostProcessor.postProcessPropertyValues(AnnotationInjectedBeanPostProcessor.java:146)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1416)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:592)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515)
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:845)
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:877)
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:549)
	at org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:701)
	at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:667)
	at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:715)
	at org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:590)
	at org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:529)
	at org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:169)
	at javax.servlet.GenericServlet.init(GenericServlet.java:160)
	at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1280)
	at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1193)
	at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:865)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:136)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:936)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1004)
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)
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其上的bug很多，但是归结一点就是

zookeeper not connected
1

之后我又上谷歌上搜了很多资料，解决以上方法主要归结于一下几点：

1.处于linux的zookeeper服务是否启动

在linux环境下输入命令

./zkServer.sh status
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该命令可以查看zookeeper是否已经启动，如出现一下代码，则表示zookeeper已经成功启动。

但是如果没有出现以上的代码，则需要启动zookeeper服务才行，代码如下

./zkServer.sh start
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该命令可以启动zookeeper，之后可去idea项目看看zookeeper是否连接成功！

2.设置最大timeout时间

如果方法一的zookeeper开启后还是不能正常连接zookeeper，可尝试以下方法

在dubbo中默认连接timeout时间为3000即为3秒，如果超出这个时间就会报错（zookeeper not connected ），这是我们可以延长最大超时时间为10秒，修改方式如下：

在applicationContext里配置dobbo的注册中心时，加上timeout属性即可

3.查看linux的防火墙是否关闭

我开始也不知道自己的防火墙是否关闭，我也不知道防火墙对于该连接有什么影响，自己也是硬着头皮去将linux的防火墙关闭了（防火墙是我的知识漏洞）

查看当前防火墙状态：

service iptables status
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如果出现以下代码，则表示防火墙已经关闭

那么如果linux的防火墙没有关闭，我们该执行怎样的命令呢？

//暂时关闭防火墙
systemctl stop firewalld

service  iptables stop

//永久关闭防火墙
systemctl disable firewalld

chkconfig iptables off
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什么时暂时关闭和永久关闭？
暂时关闭后linux重启防火墙会依然开启，永久关闭后linux重启后防火墙是关闭的

但是我又上网查了资料，防火墙的更新（开启或关闭）需要重启linux，所以我建议使用永久关闭防火墙的方法

chkconfig iptables off
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永久关闭防火墙后记得重启linux，防火墙的更新才会生效，重启后记得开启zookeeper服务并在idea测试是否能重新正常连接zookeeper。

4.查看自己在ieal配置zookeeper时linux的ip地址是否正确

有时候我们的ip地址可能写错了，请仔细检查
我们也可以在window下的cmd窗口ping一下我们的linux的ip地址，如果出现如下所示，表示我们ip是没有错误的

5.别忘了将每个maven项目install

当你对maven项目进行修改后，因为一些maven可能要依赖另一些maven，所以每次修改执行前，都要对maven进行install以更新或加载到本地仓库。（install会自动进行compile以检查错误）

以上是我在谷歌、百度上查到的解决方法的一个小总结，当然以上方法我都试过了，我的zookeeper依然还是连接不上。我还是不知到问题出在了哪儿，于是我将zookeeper安装到了windows本地，使用ip地址zookeeper://127.0.0.1:2181
查看是否能够连接到zookeeper，结果果然是连接成功了，没有报任何错误。所以我的bug依然是在是否能连接到linux的IP上。于是我又不断地对linux进行重启、关闭防火墙等操作，第一天还是没能成功，但是当我第二天打开linux后，ideal中居然成功地连接到了zookeeper，我也感到很神奇。
总之，如果使用以上5种方法后在ieal依然不能成功连接zookeeper，不妨今天就将linux关闭了，第二天开启linux和zookeeper服务，说不定就能成功连接到zookeeper注册中心了