title: Spring Boot App runs scheduled job twice
body: <p>My Problem is that the scheduled method "updateMembers" is called twice.
  I googled for hours now and all i found was that the Problem may is that the class Scheduler is initialized twice but i don't know how to fix this.
  Any suggestions?</p>
  
  <pre><code>@Configuration
  @EnableScheduling
  public class Scheduler {
  
  @Autowired
  PersistenceService persistenceService;
  
  @Scheduled(cron = "* */15 * * * *")
  public void updateMembers(){
      try {
          persistenceService.updateMembers();
      }catch (IOException e){
          Logger.getLogger(Application.class.getName())
                  .error("Scheduled updating of guildmembers failed due to: " + e.getMessage());
      }
  }
  </code></pre>
  
  <p>Maybe the Problem is somewhere else? 
  On my local machine this behaviour didn't occur. On my webserver the second call is fired up after ~47 seconds. The job needs about 2 minutes</p>