Spring, instance variable visibility in new thread started from @PostConstruct

Question

Does spring garantee visibility of 'sleepInterval' and 'businessLogic' instance variables in case below?

import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;

import javax.annotation.PostConstruct;

@Service
public class SomeService implements Runnable {

  @Value("${sleepInterval}")
  private Long sleepInterval;

  @Autowired
  private BusinessLogicService businessLogic;

  @PostConstruct
  public void postConstruct() {
      new Thread(this).start();
  }

  @Override
  public void run() {
      while (true) {
          try {
              Thread.sleep(sleepInterval);

              businessLogic.doSomeBusinessLogic();

          } catch (InterruptedException e) {
              //handle error
          }
      }
  }
}

I think there should be a visibility problem. But I couldn't reproduce it.

Answer 1

There won't be a visibility problem. The Java Memory Model guarantees that everything done (or visible due to a happens-before relationship) in one thread before a call to Thread.start will be seen by the thread that was started:

From the specification in the JLS section 17.4.5 :

A call to start() on a thread happens-before any actions in the started thread.