YunWZ opened a new issue, #11645:
URL: https://github.com/apache/dubbo/issues/11645

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   ## Ask your question here
   
   I try to start `dubbo-samples-annotation` project, but failed.
   
   First, I start `AnnotationProviderBootstrap`, that is ok.
   and output log :
   ```text
   [24/02/23 12:38:13:013 CST] main  INFO server.Server:  [DUBBO] qos-server 
bind localhost:22222, dubbo version: 3.2.0-beta.5-SNAPSHOT, current host: 
192.168.31.232
   ```
   
   And then, I try  to start `AnnotationConsumerBootstrap`, it's failed! The 
output log below:
   ```text
   [24/02/23 12:51:28:028 CST] DubboShutdownHook  WARN 
integration.RegistryProtocol:  [DUBBO] null, dubbo version: 
3.2.0-beta.5-SNAPSHOT, current host: 192.168.31.232, error code: 99-0. This may 
be caused by unknown error in registry module, go to 
https://dubbo.apache.org/faq/99/0 to find instructions. 
   java.lang.NullPointerException
        at 
org.apache.dubbo.registry.integration.RegistryProtocol$ExporterChangeableWrapper.unexport(RegistryProtocol.java:913)
        at 
org.apache.dubbo.registry.integration.RegistryProtocol$DestroyableExporter.unexport(RegistryProtocol.java:695)
        at 
org.apache.dubbo.config.ServiceConfig.unexport(ServiceConfig.java:195)
        at 
org.apache.dubbo.config.deploy.DefaultModuleDeployer.postDestroy(DefaultModuleDeployer.java:241)
        at 
org.apache.dubbo.rpc.model.ModuleModel.onDestroy(ModuleModel.java:109)
        at org.apache.dubbo.rpc.model.ScopeModel.destroy(ScopeModel.java:115)
        at 
org.apache.dubbo.rpc.model.ApplicationModel.onDestroy(ApplicationModel.java:260)
        at org.apache.dubbo.rpc.model.ScopeModel.destroy(ScopeModel.java:115)
        at 
org.apache.dubbo.config.DubboShutdownHook.doDestroy(DubboShutdownHook.java:123)
        at 
org.apache.dubbo.config.DubboShutdownHook.run(DubboShutdownHook.java:78)
   ```


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