MethodValidationPostProcessor conflict with Scheduler

[Zheaoli]

I use the Spring Boot v2.0.5.RELEASE which depends on Spring 5.0.9 Release

I got a problem when I need both MethodValidationPostProcessor and Scheduled

here's the detail.

When I just use Scheduled like below

@SpringBootApplication
@EnableConfigServer
@EnableScheduling
public class SpringConfigServerApplication {
    public static void main(String[] args) {
        SpringApplication.run(SpringConfigServerApplication.class, args);
    }

    @Scheduled(fixedDelay = 5000)
    public void test() {
        System.out.println("Demo");
    }
}

the scheduler works well as what I want. But when I add a MethodValidationPostProcessor like below

@SpringBootApplication
@EnableConfigServer
@EnableScheduling
public class SpringConfigServerApplication {
    public static void main(String[] args) {
        SpringApplication.run(SpringConfigServerApplication.class, args);
    }

    @Bean
    public MethodValidationPostProcessor methodValidationPostProcessor() {
        MethodValidationPostProcessor methodValidationPostProcessor = new MethodValidationPostProcessor();
        methodValidationPostProcessor.setProxyTargetClass(true);
        return methodValidationPostProcessor;
    }

    @Scheduled(fixedDelay = 5000)
    public void test() {
        System.out.println("Demo");
    }
}

the scheduler doesn't work. I have already checked the org.springframework.scheduling.config.ScheduledTaskRegistrar, the scheduler inits as well, but there isn't any task in all of the task variables such as fixedRateTasks, fixedDelayTasks and etc.

Is there any chance that we can use MethodValidationPostProcessor and the scheduler together?

[snicoll]

@Zheaoli the post-processor method should be static to prevent early initialization of the whole chain. You also should have a message in the log stating that some beans couldn't be post-processed. This is the reason why scheduling doesn't work with such arrangement. If moving it to static doesn't fix the problem, please share a small sample (zip or github repo) we can run ourselves and we can reconsider.

[Zheaoli]

Your suggestion is working! thanks! BTW, is there any chance to add a tips in documentation? I think this chain make many people confuse