春季启动批处理进程ItemProcessor impl自动连线为空

Question

我试图在ItemProcessorImpl中使用@Autowired EmailSerive，但是它抛出空指针异常

示例

@Component
public class PeopleItemProcessor implements ItemProcessor<People, People> {

    private static final Logger log = LoggerFactory.getLogger(PeopleItemProcessor.class);

        @Autowired
        EmailService emailService;


    @Override
    public People process(People item) throws Exception {

        People people = new People();
        emailService.emailServiceHTML(item.getEmail(), "Test Email");
        log.debug("-------mail trigger or not----");
        people.setId(item.getId());
        people.setDate(new Date());
        people.setIsSent(Boolean.TRUE);
        people.setEmail(item.getEmail());
        people.setFirstName(item.getFirstName());
        people.setLastName(item.getLastName());
        return people;
    }      
}

EmailService

@Component 
public class EmailService {

    @Autowired
    private JavaMailSender mailSender;

    public void emailServiceHTML(String to, String subject) throws MessagingException {

            MimeMessage message = mailSender.createMimeMessage();
            MimeMessageHelper helper = new MimeMessageHelper(message);       
            helper.setTo(to);
            helper.setText("hi ", true); // set to html
            helper.setSubject(subject);
            mailSender.send(message);
    }
}