Null exception while send mail in Spring Boot?

Question

My function to send email

    @Autowired
    private MailService mailService;[![enter image description here][2]][2]
    public void sendMailConfirm(String receiverAddress, int orderId) {
        Mail mail = new Mail();
        mail.setMailFrom(senderAddress);
        mail.setMailTo(receiverAddress);
        mail.setMailSubject(mailSubject);
        mail.setMailContent(mailContent + "\n\nOrder ID: " + orderId);

        mailService.sendMail(mail);
    }

My Mail class


public class Mail {
    private String mailFrom;

    private String mailTo;

    private String mailSubject;

    private String mailContent;

    private String contentType;

    private List<Object> attachments;

    getter & setter

I wrote this in an API. But when I test this. It returns a null exception. Please help me!

                //  send mail to notif success order
                Manager manager = new Manager();
                manager.sendMailConfirm(orderVM.getEmail(), order.getId());

Error stack please . Also the use of new suggests you are not using spring the correct way — R.G
– R.G, Commented Feb 5, 2020 at 8:31
The information shared is not adequate to help you. Here the order or mailService could be null, but that is a guess. Could you please share all the code that will reproduce this issue . Please try to improve the question with enough information to help you out — R.G
– R.G, Commented Feb 5, 2020 at 10:34
@R.G I don't understand. the orderVM.getEmail() and order.getId() always return result not null. Why the function can get null? — 泉泉占柱
– 泉泉占柱, Commented Feb 5, 2020 at 10:52

Jan Held · Accepted Answer · 2020-02-05 10:57:13Z

1

The NullPointerException apparently occur here:

 mailService.sendMail(mail);

Make sure that the mailService in your Manager class is not null.

If you are in a Spring Boot context the Manager probably should not be initialized manually but that's just an assumption, as I don't know the rest of the code.

edited Feb 5, 2020 at 10:57

answered Feb 5, 2020 at 10:53

Jan Held

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6 Comments

泉泉占柱 Over a year ago

But I autowired it.

Jan Held Over a year ago

I mean, you create Manager manager = new Manager(); by yourself. Or did I miss something?

Jan Held Over a year ago

As soon as you create the the Manager by yourself, nothing within it gets autowired. But you could autowire the Manager itself. Then the MailService will be probably injected.

泉泉占柱 Over a year ago

How can my mailService can be null? I don't understand

泉泉占柱 Over a year ago

I resolved. I wrote that function into MailService class then I can use it correctly. Thanks!

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