Execute method on startup in spring

Is there any Spring 3 feature to execute some methods when the application starts for the first time? I know that I can do the trick of setting a method with @Scheduled annotation and it executes just after the startup, but then it will execute periodically.

Thanks.

---

If by "application startup" you mean "application context startup", then yes, there are many ways to do this, the easiest (for singletons beans, anyway) being to annotate your method with @PostConstruct . Take a look at the link to see the other options, but in summary they are:

Methods annotated with @PostConstruct

afterPropertiesSet() as defined by the InitializingBean callback interface

A custom configured init() method

Technically, these are hooks into the bean lifecycle, rather than the context lifecycle, but in 99% of cases, the two are equivalent.

If you need to hook specifically into the context startup/shutdown, then you can implement the Lifecycle interface instead, but that's probably unnecessary.

---

This is easily done with an ApplicationListener . I got this to work listening to Spring's ContextRefreshedEvent :

import org.springframework.context.ApplicationListener;
import org.springframework.context.event.ContextRefreshedEvent;
import org.springframework.stereotype.Component;

@Component
public class StartupHousekeeper implements ApplicationListener<ContextRefreshedEvent> {

  @Override
  public void onApplicationEvent(final ContextRefreshedEvent event) {
    // do whatever you need here 
  }
}

Application listeners run synchronously in Spring. If you want to make sure you're code is executed only once, just keep some state in your component.

UPDATE

Starting with Spring 4.2+ you can also use the @EventListener annotation to observe the ContextRefreshedEvent (thanks to @bphilipnyc for pointing this out):

import org.springframework.context.ApplicationListener;
import org.springframework.context.event.ContextRefreshedEvent;
import org.springframework.stereotype.Component;

@Component
public class StartupHousekeeper {

  @EventListener(ContextRefreshedEvent.class)
  public void contextRefreshedEvent() {
    // do whatever you need here 
  }
}

---

在Spring 4.2中，你现在可以简单地做到：

@Component
class StartupHousekeeper {

    @EventListener(ContextRefreshedEvent.class)
    void contextRefreshedEvent() {
        //do whatever
    }
}

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