Java listen ContextRefreshedEvent

Question

I have class X in my spring application in which I want to find out if all spring beans have been initialized. For this, I'm trying to listen to ContextRefreshedEvent.

So far I have the following code, but I'm not sure if this is enough.

import org.springframework.context.ApplicationListener; import org.springframework.context.event.ContextRefreshedEvent; public classX implements ApplicationListener<ContextRefreshedEvent> { @Override public void onApplicationEvent(ContextRefreshedEvent event) { //do something if all apps have initialised } } 

• Is this approach right to find out if all beans were initials?
• What else do I need to do to listen to ContextRefreshedEvent? Do I need to register class X somewhere in xml files?

Answer 1

A ContextRefreshEvent occurs

when ApplicationContext initialized or updated.

so that you are on the right track.

What you need to do is declare a bean definition for classX .

Either using @Component or through component scan of a component in

 @Component public classX implements ApplicationListener<ContextRefreshedEvent> { @Override public void onApplicationEvent(ContextRefreshedEvent event) { //do something if all apps have initialised } } 

or with the declaration <bean>

 <bean class="some.pack.classX"></bean> 

Spring will detect that the bean is of type ApplicationListener and register it without any additional configuration.

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Just FYI, Java has naming conventions for types, variables, etc. For classes, the convention is that their names begin with an uppercase alphabetic character.

Answer 2

Spring> = 4.2

You can use an annotation driven event listener as shown below:

 @Component public class classX { @EventListener public void handleContextRefresh(ContextRefreshedEvent event) { } } 

The ApplicationListener that you want to register is defined in the method signature .