### Environment
* Dubbo version: 2.7.4.1
* Operating System version: Win7
* Java version: jdk8
### Steps to reproduce this issue
1. Dubbo 2.7.4.1 Use zookeeper registry, generic call reports an error:
'zookeeper not connected '.
2. Dubbo 2.7.3 no such problem
### Expected Result
Interface accessed successfully
### Actual Result
java.lang.IllegalStateException: zookeeper not connected
If there is an exception, please attach the exception trace:
```
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
org.apache.dubbo.config.AbstractInterfaceConfig$$Lambda$38/1374066265.get(Unknown
Source)
at java.util.Optional.orElseGet(Optional.java:267)
at
org.apache.dubbo.config.AbstractInterfaceConfig.lambda$useRegistryForConfigIfNecessary$8(AbstractInterfaceConfig.java:620)
at
org.apache.dubbo.config.AbstractInterfaceConfig$$Lambda$37/1704237553.accept(Unknown
Source)
at java.util.Optional.ifPresent(Optional.java:159)
at
org.apache.dubbo.config.AbstractInterfaceConfig.useRegistryForConfigIfNecessary(AbstractInterfaceConfig.java:618)
at
org.apache.dubbo.config.AbstractInterfaceConfig.checkRegistry(AbstractInterfaceConfig.java:208)
at
org.apache.dubbo.config.ReferenceConfig.createProxy(ReferenceConfig.java:378)
at
org.apache.dubbo.config.ReferenceConfig.init(ReferenceConfig.java:329)
at org.apache.dubbo.config.ReferenceConfig.get(ReferenceConfig.java:250)
```
### Sample code
```
ApplicationConfig application = new ApplicationConfig();
application.setName("api-generic-consumer");
ReferenceConfig<GenericService> reference = new ReferenceConfig<>();
reference.setVersion("1.0.0");
RegistryConfig registry = new RegistryConfig();
registry.setProtocol(Constants.REGISTRY_ZOOKEEPER);
registry.setAddress("192.168.0.58:2181,192.168.0.59:2181,192.168.0.60:2181");
reference.setRegistry(registry);
reference.setTimeout(2000);
reference.setGeneric(true);
reference.setApplication(application);
reference.setInterface("com.xxxxx.api.IXxxService");
GenericService genericService = reference.get();
Object obj = genericService.$invoke("getXxx", new
String[]{Long.class.getName()}, new Long[]{1L});
String json = JsonUtils.toJson(obj);
System.out.println(json);
```
[ Full content available at: https://github.com/apache/dubbo/issues/5276 ]
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