@Scheduled methods in @Lazy beans are not scheduled [SPR-12872]

[spring-projects-issues]

Ivan Bovin opened SPR-12872 and commented

If we have a @Scheduled method in a @Lazy bean, it will be added to ScheduledTaskRegistrar (e.g. using a addFixedDelayTask method) but not scheduled in the taskScheduler.

Example:

@Lazy
@Component
public class SampleBean {
    @Scheduled(fixedDelay = 500)
    public void task() {
        System.out.println("-");
    }
}

---

Affects: 4.1.5

Issue Links:

• ScheduledAnnotationBeanPostProcessor should unregister tasks on destruction of individual beans [SPR-12216] #16830 ScheduledAnnotationBeanPostProcessor should unregister tasks on destruction of individual beans
• @Scheduled methods in @Lazy beans are not scheduled [SPR-17587] #22119 @Scheduled methods in @Lazy beans are not scheduled
• Performance regression when scheduling is enabled and context contains URL beans [SPR-14666] #19230 Performance regression when scheduling is enabled and context contains URL beans
• Improve reference documentation for Task Execution and Scheduling about bean scopes [SPR-14167] #18739 Improve reference documentation for Task Execution and Scheduling about bean scopes

Referenced from: commits ab478d1

[spring-projects-issues]

Juergen Hoeller commented

This is unfortunately a known limitation at this point: @Scheduled only really works on non-lazy singletons. We'll revisit this for 4.2.

Juergen

[spring-projects-issues]

Juergen Hoeller commented

As of 4.3 RC2, ScheduledAnnotationBeanPostProcessor features a revised registration mechanism capable of tracking individual bean instances, both on creation for beans of any scope and on destruction of each individual bean. In other words, @Scheduled works on any Spring-managed bean now, not just on non-lazy singleton beans anymore.