using @postconstruct and @Scheduled annotation together

Question

I am new learner and using spring annotation for configuration Can i use both @PostConstruct and @Scheduled(fixedRate = 60L * 1000L) on same method as given below ? if yes what should be the annotation to class ?

@Component
public class Cache {

     @PostConstruct
     @Scheduled(fixedRate = 60L * 1000L)
     public void refreshCache() {
     ...
     }

}

Answer 1

Yes, your annotations in the class are correct. But you better use:

@Scheduled(fixedRate = 60L * 1000L, initialDelay=0)
public void refreshCache() {

without the @PostConstruct because:

1. Only one method in the class can be annotated with @PostConstruct .
2. You can not throw checked exceptions from the method using @PostConstruct .
3. Others will not have autowired this component.

There are more causes but I stop here.

Answer 2

If you do not use any xml, this example should be what you want, which actually is a spring boot application. https://github.com/soiff-spring/spring-boot-example

---

My full example is here: https://github.com/soiff-spring/spring-mvc-example

Please pay attention to following file and class:

1. hello-servlet.xml
2. HelloScheduler

Packaing this project and put it in your tomcat container and start your tomcat, you'll see the log as following:

20:06:53.003 [pool-1-thread-1] INFO xyz.cloorc.example.springmvc.HelloScheduler - 1480594013001 : hello world ...
20:06:54.001 [pool-1-thread-1] INFO xyz.cloorc.example.springmvc.HelloScheduler - 1480594014001 : hello world ...
20:06:55.001 [pool-1-thread-1] INFO xyz.cloorc.example.springmvc.HelloScheduler - 1480594015001 : hello world ...
20:06:56.002 [pool-1-thread-1] INFO xyz.cloorc.example.springmvc.HelloScheduler - 1480594016002 : hello world ...
20:06:57.000 [pool-1-thread-1] INFO xyz.cloorc.example.springmvc.HelloScheduler - 1480594017000 : hello world ...
20:06:58.002 [pool-1-thread-1] INFO xyz.cloorc.example.springmvc.HelloScheduler - 1480594018002 : hello world ...

Enjoy yourself.