AlbumenJ commented on issue #13675:
URL: https://github.com/apache/dubbo/issues/13675#issuecomment-2002771902
> > In org/apache/dubbo/config/deploy/DefaultModuleDeployer.java:183
>
> i think there is also exist the problem, the case is come from.
>
> ```java
> for (String serviceName : serviceNames) {
> List<Instance> instances =
> namingService.getAllInstances(serviceName,
getUrl().getGroup(Constants.DEFAULT_GROUP));
> notifySubscriber(url, serviceName, listener,
instances);
> }
> for (String serviceName : serviceNames) {
> subscribeEventListener(serviceName, url, listener);
> }
> ```
>
> **namingService.getAllInstances(serviceName,
getUrl().getGroup(Constants.DEFAULT_GROUP));**
>
> When there is no provider, The final effect of this code is to obtain the
instance and subscribe. the subscription at this time has side effects. The
reason is that the listener is not registered.
>
> Before the listener is registered, if the service provider registration
message is received, Then the message will be lost.
> The reason is that the listener is not registered.
Why?
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