Question

I have the following class that is in a library:

public class TaskExecutor {
  @PostConstruct
  public void postConstruct() {
    // should fail if <task:annotation-driven /> is not set,
    // because execute() needs to run
  }

  @Scheduled(fixedDelay = 1000)
  public void execute() {
    // do stuff that always needs to run
  }
}

I want to fail the PostConstruct if task:annotation-driven is not set in the spring context. The idea is that a developer using this library will fail hard on spring start if the setting is missing, instead of soft after deployment.

Answer 1

I’d advise against that because you’re tying your app to Spring more than necessary, but:

I think you can do it by injecting the ApplicationContext and asking it for the existence of a bean that is always set by <task:annotation-driven />, e.g.
AsyncAnnotationBeanPostProcessor