chickenlj commented on issue #9422:
URL: https://github.com/apache/dubbo/issues/9422#issuecomment-994558226
```java
public void preDestroy() {
if (!this.isStopping() && !this.isStopped()) {
this.onStopping();
this.unRegisterShutdownHook();
if (this.asyncMetadataFuture != null) {
this.asyncMetadataFuture.cancel(true);
}
this.unregisterServiceInstance();
this.unexportMetadataService();
}
}
```
ApplicationModel.java
```java
protected void onDestroy() {
if (this.deployer != null) {
this.deployer.preDestroy();
}
Iterator var1 = (new ArrayList(this.moduleModels)).iterator();
while(var1.hasNext()) {
ModuleModel moduleModel = (ModuleModel)var1.next();
if (moduleModel != this.internalModule) {
moduleModel.destroy();
}
}
this.internalModule.destroy();
if (defaultInstance == this) {
Class var5 = ApplicationModel.class;
synchronized(ApplicationModel.class) {
this.frameworkModel.removeApplication(this);
defaultInstance = null;
}
} else {
this.frameworkModel.removeApplication(this);
}
if (this.deployer != null) {
this.deployer.postDestroy();
}
this.notifyDestroy();
if (this.environment != null) {
this.environment.destroy();
this.environment = null;
}
if (this.configManager != null) {
this.configManager.destroy();
this.configManager = null;
}
if (this.serviceRepository != null) {
this.serviceRepository.destroy();
this.serviceRepository = null;
}
this.frameworkModel.tryDestroy();
}
```
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