SpringBoot ordinary classes are null when injected with @Autowired

1. The problems encountered, ordinary class use

@Autowired

private static ICDahuaService cDahuaService;

cDahuaService is null

 2. Solution

Now cDahuaService is not empty

注意：StartServiceCallBack.CDahuaService = cDahuaService;

Where StartServiceCallBack is the class name of the current class