[GitHub] [dubbo] pinxiong commented on issue #8225: 关于 @DubboReference 注解中不配置URL问题

[GitBox <gi...@apache.org>]

pinxiong commented on issue #8225:
URL: https://github.com/apache/dubbo/issues/8225#issuecomment-890278065


   > org.apache.dubbo.rpc.RpcException: Failed to invoke the method sayHello in the service cn.raysonblog.shopservice.api.service.RpcShopService. No provider available for the service cn.raysonblog.shopservice.api.service.RpcShopService:1.0.0 from registry 192.168.0.20:8848 on the consumer 192.168.0.20 using the dubbo version 3.0.1. Please check if the providers have been started and registered.
   
   I have downloaded the [demo](https://wws.lanzoui.com/iRgEPrzde0j) you provided, and want to reproduce the issue you reported. 
   
   ```java
   org.apache.dubbo.rpc.RpcException: Failed to invoke the method sayHello in the service cn.raysonblog.shopservice.api.service.RpcShopService. No provider available for the service cn.raysonblog.shopservice.api.service.RpcShopService:1.0.0 from registry 192.168.31.167:8848 on the consumer 192.168.31.167 using the dubbo version 3.0.1. Please check if the providers have been started and registered.
   	at org.apache.dubbo.rpc.cluster.support.AbstractClusterInvoker.checkInvokers(AbstractClusterInvoker.java:288) ~[dubbo-3.0.1.jar:3.0.1]
   	at org.apache.dubbo.rpc.cluster.support.FailoverClusterInvoker.doInvoke(FailoverClusterInvoker.java:59) ~[dubbo-3.0.1.jar:3.0.1]
   	at org.apache.dubbo.rpc.cluster.support.AbstractClusterInvoker.invoke(AbstractClusterInvoker.java:265) ~[dubbo-3.0.1.jar:3.0.1]
   	......
   ```
   
   I'm sure that there are something wrong with `Nacos` when exporting the provider, because the exception doesn't throw in `NacosRegistry`
   
   ```java
   private void execute(NamingServiceCallback callback) {
       try {
           callback.callback(namingService);
       } catch (NacosException e) {
           // don't throw any exception 
           if (logger.isErrorEnabled()) {
               logger.error(e.getErrMsg(), e);
           }
       }
   }
   ```
   
   By contrast, all exception will throw in `ZookeeperRegistry`, I'll provide a PR to fix this problem in `NacosRegistry` later
   ```java
   public void doRegister(URL url) {
       try {
           zkClient.create(toUrlPath(url), url.getParameter(DYNAMIC_KEY, true));
       } catch (Throwable e) {
           throw new RpcException("Failed to register " + url + " to zookeeper " + getUrl() + ", cause: " + e.getMessage(), e);
       }
   }
   ```
   
   Now, I need your help to provide more detailed error log, you can get it in `logs/nacos/remote.log` file


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