Dubbo连接Zookeeer：zookeeper not connected

dubbo连接Zookeeer：zookeeper not connected

首先，贴出报错问题

Exception in thread "main" 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:70)
	at org.apache.dubbo.configcenter.support.zookeeper.ZookeeperDynamicConfigurationFactory.createDynamicConfiguration(ZookeeperDynamicConfigurationFactory.java:37)
	at org.apache.dubbo.common.config.configcenter.AbstractDynamicConfigurationFactory.lambda$getDynamicConfiguration$0(AbstractDynamicConfigurationFactory.java:39)
	at java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1660)
	at org.apache.dubbo.common.config.configcenter.AbstractDynamicConfigurationFactory.getDynamicConfiguration(AbstractDynamicConfigurationFactory.java:39)
	at org.apache.dubbo.common.config.configcenter.DynamicConfiguration.getDynamicConfiguration(DynamicConfiguration.java:223)
	at org.apache.dubbo.config.bootstrap.dubboBootstrap.prepareEnvironment(dubboBootstrap.java:815)
	at org.apache.dubbo.config.bootstrap.dubboBootstrap.startConfigCenter(dubboBootstrap.java:560)
	at org.apache.dubbo.config.bootstrap.dubboBootstrap.useRegistryAsConfigCenterIfNecessary(dubboBootstrap.java:624)
	at org.apache.dubbo.config.bootstrap.dubboBootstrap.initialize(dubboBootstrap.java:508)
	at org.apache.dubbo.config.bootstrap.dubboBootstrap.start(dubboBootstrap.java:698)
	at org.apache.dubbo.config.spring.context.dubboBootstrapApplicationListener.onContextRefreshedEvent(dubboBootstrapApplicationListener.java:52)
	at org.apache.dubbo.config.spring.context.dubboBootstrapApplicationListener.onApplicationContextEvent(dubboBootstrapApplicationListener.java:45)
	at org.apache.dubbo.config.spring.context.OneTimeExecutionApplicationContextEventListener.onApplicationEvent(OneTimeExecutionApplicationContextEventListener.java:40)
	at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172)
	at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165)
disconnected from the target VM, address: '127.0.0.1:51893', transport: 'socket'
	at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139)
	at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:393)
	at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:347)
	at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:883)
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:546)
	at org.springframework.context.annotation.AnnotationConfigApplicationContext.<init>(AnnotationConfigApplicationContext.java:84)
	at com.lagou.dubboPureMain.main(dubboPureMain.java:21)
Caused by: java.lang.IllegalStateException: zookeeper not connected
	at org.apache.dubbo.remoting.zookeeper.curator.CuratorZookeeperClient.<init>(CuratorZookeeperClient.java:80)
	... 26 more
Exception in thread "dubboShutdownHook" java.lang.RuntimeException: java.lang.NullPointerException
	at org.apache.dubbo.common.function.ThrowableAction.execute(ThrowableAction.java:48)
	at org.apache.dubbo.common.lang.ShutdownHookCallbacks.lambda$callback$0(ShutdownHookCallbacks.java:70)
	at java.lang.Iterable.forEach(Iterable.java:75)
	at org.apache.dubbo.common.lang.ShutdownHookCallbacks.callback(ShutdownHookCallbacks.java:70)
	at org.apache.dubbo.config.dubboShutdownHook.callback(dubboShutdownHook.java:81)
	at org.apache.dubbo.config.dubboShutdownHook.run(dubboShutdownHook.java:69)
Caused by: java.lang.NullPointerException
	at org.apache.dubbo.config.bootstrap.dubboBootstrap.unexportMetadataService(dubboBootstrap.java:857)
	at org.apache.dubbo.config.bootstrap.dubboBootstrap.destroy(dubboBootstrap.java:996)
	at org.apache.dubbo.config.bootstrap.dubboBootstrap$1.callback(dubboBootstrap.java:190)
	at org.apache.dubbo.common.function.ThrowableAction.execute(ThrowableAction.java:46)
	... 5 more

可以看出，zookeeper连接不上，但是服务器的zk明明以及启动

并且用zkClient或者其他API方式都可以正常连接zk，很纳闷！！！
这是本地的dubbo连接zk的代码

  public static void main(String[] args) throws Exception{
        // 启动环境，基于标注的上下文环境  AnnotationConfigApplicationContext
        AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(ProviderConfiguration.class);
        context.start();
        system.in.read();

    }

    @Configuration
    @Enabledubbo(scanBasePackages = "com.lagou.service.impl")
    @PropertySource("classpath:/dubbo-provider.properties")
    static class ProviderConfiguration{

        @Bean
        public RegistryConfig registryConfig(){
            RegistryConfig registryConfig = new RegistryConfig();
            registryConfig.setAddress("zookeeper://本地虚拟机地址:2181");
            return registryConfig;
        }
    }

dubbo的配置文件如下：

dubbo.application.name=service-provider
dubbo.protocol.name=dubbo
dubbo.protocol.port=20880

后来经过查找资料，找到问题原因所在，因为zk的超时连接设置，
解决方案如下：
1. 调用本地的zk注册中心
2. 调整zk的超时连接时间，如下：我是这样解决的，在dubbo配置文件中修改zk的连接超时时间
3.
配置文件修改为如下：问题解决

dubbo.application.name=service-provider
dubbo.protocol.name=dubbo
dubbo.protocol.port=20880
dubbo.config-center.timeout=6000

希望可以帮助到你！