Team, I am working on a project which refreshes the cache data on a timely manner. This piece of code sits on a java library and this java library is consumed by a Spring boot application. Now, as per the design, the refresh.interval should be set by the client(spring boot app). I want to design this in such a way that if client do not set this key refresh.interval, the scheduler should not even kick in. Currently the application is failing with an error message if key is not provided,

Encountered invalid @Scheduled method 'refresh': Could not resolve placeholder 'refresh.interval' in value "${refresh.interval}"

Library code:

@Component
public class Scheduler {

    @Value("${refresh.interval:#{null}}")
    private String refreshInterval;

    @Scheduled(fixedRateString = "${refresh.interval}")
    public void refresh() {
        if (StringUtils.isNotBlank(refreshInterval)) {
           Cache.refresh();
        }
    }
}

Team, I am working on a project which refreshes the cache data on a timely manner. This piece of code sits on a java library and this java library is consumed by a Spring boot application. Now, as per the design, the refresh.interval should be set by the client(spring boot app). I want to design this in such a way that if client do not set this key refresh.interval, the scheduler should not even kick in. Currently the application is failing with an error message if key is not provided,

Encountered invalid @Scheduled method 'refresh': Could not resolve placeholder 'refresh.interval' in value "${refresh.interval}"

Library code:

@Component
public class Scheduler {

    @Value("${refresh.interval:#{null}}")
    private String refreshInterval;

    @Scheduled(fixedRateString = "${refresh.interval}")
    public void refresh() {
        if (StringUtils.isNotBlank(refreshInterval)) {
           Cache.refresh();
        }
    }
}

• java
• spring
• spring-boot
• scheduler

1 Answer 1

You can use @ConditionalOnProperty to restrict startup conditions

@Component
@ConditionalOnProperty(name = "refresh.interval")
public class TestConfig {
    
    @Scheduled(fixedRateString = "${refresh.interval}")
    public void refresh() {
        System.out.println("refresh");
    }
}