Spring Fix @Configuration class's setBeanFactory method is called multiple times

@Configuration class's setBeanFactory method is called multiple times.

• First point is AbstractAutowireCapableBeanFactory#invokeAwareMethods.
• Second point is ImportAwareBeanPostProcessor#postProcessProperties.

So, I think we can clean some code.

I don't know if I am right, I am looking forward to your answer.

Comment From: chenqimiao

Maybe I need to provide a sample code.

@Configuration
public class AppConfig implements BeanFactoryAware {

    @Override
    public void setBeanFactory(BeanFactory beanFactory) throws BeansException {
        System.out.println("Call AppConfig#beanFactory method ");
    }
}

public class TestApplication {

    public static void main(String args[]) {
       new AnnotationConfigApplicationContext(AppConfig.class);    
    }
}

Run main method of TestApplication class, the string of "Call AppConfig#beanFactory method" will be printed two times.

Comment From: sbrannen

I've edited your comments to improve the formatting. You might want to check out this Mastering Markdown guide for future reference.

Comment From: chenqimiao

@sbrannen Thanks, I will pay attention to my format in the future.

Comment From: snicoll

Thanks for the PR and the proposal. None of the Aware callback APIs have a contract that the callback is only called once. What can be seen as an optimization is more complex than this, with other code path where the code you've removed would be the only time where we get a chance to set the BeanFactory.