java.lang.IllegalStateException: Encountered invalid @Scheduled method: Could not resolve placeholder @PropertySource("classpath:dev.yml")

Question

I'm trying to load the following cron-execution-expression:

---
####################### Cron-Job Every 2mins every day #######################
cron:
  exe:
    expression: 0 0/2 * * * ?

The catch is, the above cron-expression is in a Spring-Cloud-Config (Let's say Springboot Project A, running on port: 8001) github repository. named: microservice-dev.yml

Project B (port: 8002) loads all the configurations provided by Project A at startup & I'm happy with that. But how do I locate this expression?

${cron.exe.expression}

@Component
//Couldn't get it to work with Spring-Cloud-Config
@PropertySource("classpath:microservice-dev.yml")
public class MergeCachedRecordsToDBImpl {
    private static final Logger LOGGER = LoggerFactory.getLogger(MergeCachedRecordsToDBImpl.class);

    //Couldn't get it to work with Spring-Cloud Config
    @Scheduled(cron = "${cron.exe.expression}")
    public void purgeExpired() {
        LOGGER.info("Cron-Job Notification....");
        LOGGER.info("Cron-Job executed at: {}", new Timestamp(new Date().getTime()));
    }
}

At some point, I got it to work, but I'm not sure how? I'm trying to retrace my steps.

Now I'm getting this exception:

Caused by: java.lang.IllegalStateException: Encountered invalid @Scheduled method 'purgeExpired': Could not resolve placeholder 'cron.exe.expression' in value "${cron.exe.expression}"

Answer 1

Ok, got it to work again with the .yml file. Happy Days.

In the following .yml file:

src/main/resources/bootstrap.yml

has the following contents:

---
spring:
  application:
    name: leaderboard
  profiles:
    active: dev

server:
  port: 8004

---
####################### Cron-Job Every 2mins every day #######################
cron:
  exe:
    expression: 0 0/2 * * * ?

in the code, I annotated my class and method with following annotations:

@PropertySource("classpath:bootstrap.yml")
public class CronClass{
private static final Logger LOGGER = LoggerFactory.getLogger(CronClass.class);

   @Scheduled(cron = "${cron.exe.expression}")
   private void cornJob(){
        LOGGER.info("Cron-Job Notification....");
        LOGGER.info("Cron-Job executed at: {}", new Timestamp(new Date().getTime()));
   }
}

Results:

2018-09-29 11:19:00.007  INFO [leaderboard,66037f3d8052cf6b,66037f3d8052cf6b,false] 7937 --- [   scheduling-1] i.s.l.task.CronClass    : Cron-Job Notification....
2018-09-29 11:19:00.007  INFO [leaderboard,66037f3d8052cf6b,66037f3d8052cf6b,false] 7937 --- [   scheduling-1] i.s.l.task.CronClass    : Cron-Job executed at: 2018-09-29 11:19:00.007

---

2018-09-29 11:20:00.000  INFO [leaderboard,25cab214549b76a6,25cab214549b76a6,false] 7937 --- [   scheduling-1] i.s.l.task.CronClass    : Cron-Job Notification....
2018-09-29 11:20:00.000  INFO [leaderboard,25cab214549b76a6,25cab214549b76a6,false] 7937 --- [   scheduling-1] i.s.l.task.CronClass    : Cron-Job executed at: 2018-09-29 11:20:00.0

---

2018-09-29 11:21:00.000  INFO [leaderboard,c2f241d8a806fd26,c2f241d8a806fd26,false] 7937 --- [   scheduling-1] i.s.l.task.CronClass    : Cron-Job Notification....
2018-09-29 11:21:00.000  INFO [leaderboard,c2f241d8a806fd26,c2f241d8a806fd26,false] 7937 --- [   scheduling-1] i.s.l.task.CronClass    : Cron-Job executed at: 2018-09-29 11:21:00.0