[I] 使用泛化示例，dubbo-go3.1.1 调用 java server 2.6.x，提示 No provider available for the service [dubbo-go-samples]

[via GitHub]

liusese opened a new issue, #729:
URL: https://github.com/apache/dubbo-go-samples/issues/729

   ```
   import(
     "dubbo.apache.org/dubbo-go/v3/config"
     "dubbo.apache.org/dubbo-go/v3/config/generic"
     _ "dubbo.apache.org/dubbo-go/v3/imports"
     hessian "github.com/apache/dubbo-go-hessian2"
   )
   ```
   
   ```
   regConf := &config.RegistryConfig{
     Protocol:  "zookeeper",
     Timeout:   "3s",
     Group:     "zk_srver_admin",
     Namespace: "zk_srver",
     Address:   "xxxx:2181,xxxx1:2181,xxxx2:2181,xxx3:2181,xxxx4:2181",
     RegistryType: "interface",
   }
   ```
   
   ```
   refConf := config.ReferenceConfig{
     InterfaceName: "com.domain.test.info.api.TestQueryApi",
     Cluster:       "failover",
     Protocol:      dubbo.DUBBO,
     RegistryIDs: []string{"zk"},
     ProvidedBy:  "providers",
     Generic:     "true",
     Version:     "1.0.0",
   }
   ```
   
   ```
   rootConf := config.NewRootConfigBuilder().
     SetApplication(&config.ApplicationConfig{
        Name:  "app_name",
        Owner: "xxxx",
     }).
     AddRegistry("zk", regConf).
     Build()
   
   if err := config.Load(config.WithRootConfig(rootConf)); err != nil {
   panic(err)
   }
   
   _ = refConf.Init(rootConf)
   refConf.GenericLoad("app_name")
   ```
   
   ```
   resp, err := refConf.GetRPCService().(*generic.GenericService).Invoke(
     context.TODO(),
     "getTestInfo",
     []string{"java.util.List"},
     []hessian.Object{
        []hessian.Object{
                map[string]hessian.Object{"testId": "testId001", "serId": 
"1710394936000"},
                map[string]hessian.Object{"testId": "testId002", "serId": 
"1710748418000"},
        },
     },
   )
   
   if err != nil {
     panic(err)
   }
   ```
   
   启动后，有三个 warn 信息
   
   ```
   ### 1
   
   extension/registry_directory.go:60      registry directory zookeeper does 
not exist, make sure you have import the package, will use the default 
directory type.
   ```
   
   ```
   ### 2
   
   tag/router.go:52        [tag router] invokers from previous router is empty.
   ```
   
   ```
   ### 3 error
   
   proxy/proxy.go:212      [CallProxy] received rpc err: Failed to invoke the 
method $invoke. No provider available for the service 
dubbo://:@:/?interface=com.domain.test.info.api.TestQueryApi&group=&version=1.0.0
 from registry 
zookeeper://xxxx:2181?registry=zookeeper&registry.group=zk_srver_admin&registry.label=true&registry.namespace=zk_server&registry.preferred=false&registry.role=0&registry.timeout=3s&registry.ttl=15m&registry.weight=0&registry.zone=&remote-client-name=dubbo.registries-zookeeper-xxx%3A2181%2Cxxxx1%3A2181%2Cxxxx2%3A2181%2Cxxxx3%3A2181%2Cxxxx4%3A2181&simplified=false
 on the consumer xxx.xxx.xxx.xxx using the dubbo version 3.1.1 .Please check if 
the providers have been started and registered.
   ```
   
   还请大佬帮看看是什么问题呢？


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