Spring 和 JavaMail 连接超时

Question

I'm trying to do email confirmation via gmail host. And i continue getting "Connection timeout 500 error" I tried change params in app properties, and in configuration class. Change port to 465 insteed 587, and nothing helped me.

If you found this page unreadable, which might be... there's link on full project with full stack trace ---> https://github.com/OlegSokolyk/sweater

here's my app prop:

spring.mail.host=smtp.gmail.com
spring.mail.username=mailsendtestsweater@gmail.com
spring.mail.password=vhmixskurxwrymtu
spring.mail.port=587
spring.mail.properties.mail.smtp.auth=true
spring.mail.properties.mail.smtp.starttls.enable=true
mail.debug=true

MailConfig class:

@Configuration
public class MailConfig {

    @Value("${spring.mail.host}")
    private String host;

    @Value("${spring.mail.username}")
    private String username;

    @Value("${spring.mail.password}")
    private String password;

    @Value("${spring.mail.port}")
    private int port;

    @Value("${mail.debug}")
    private String debug;

    @Bean
    public JavaMailSender getMailSender() {
        JavaMailSenderImpl mailSender = new JavaMailSenderImpl();

        mailSender.setHost(host);
        mailSender.setPort(port);
        mailSender.setUsername(username);
        mailSender.setPassword(password);

        Properties properties = mailSender.getJavaMailProperties();

        properties.put("mail.transport.protocol", "smtp");
        properties.put("mail.smtp.auth", "true");
        properties.put("mail.smtp.starttls.enable", "true");
        properties.put("mail.debug", debug);

        return mailSender;
    }
}

MailSender service:

@Service
public class MailSender {
    @Autowired
    private JavaMailSender mailSender;

    @Value("${spring.mail.username}")
    private String username;


    public void send(String emailTo, String subject, String message) {

        try {
            SimpleMailMessage mailMessage = new SimpleMailMessage();

            mailMessage.setFrom(username);
            mailMessage.setTo(emailTo);
            mailMessage.setSubject(subject);
            mailMessage.setText(message);

            mailSender.send(mailMessage);
        } catch (MailException e) {
            e.printStackTrace();
        }
    }
}

Registration method:

public boolean addUser(User user) {
        User userFromDB = userRepository.findByUsername(user.getUsername());

        if(userFromDB != null) {
            return false;
        }

        user.setActive(true);
        user.setRoles(Collections.singleton(Role.USER));
        user.setActivationCode(UUID.randomUUID().toString());

        userRepository.save(user);

        if (!StringUtils.isEmpty(user.getEmail())) {
            String message = String.format(
                    "Hello, %s! \n " +
                            "Welcome to Sweater. Please, visit next link: http://localhost:8080/activate/%s",
                    user.getUsername(),
                    user.getActivationCode()
            );

            mailSender.send(user.getEmail(), "Activation code", message);
        }

        return true;
    }

Registration controller:

@PostMapping("/registration")
    public String addUser(User user, Model model) {

        if (!userService.addUser(user)) {
            model.addAttribute("message", "User exists");
            return "registration";
        }

        return "redirect:/login";
    }

Stack trace:

org.springframework.mail.MailSendException: Mail server connection failed; nested exception is com.sun.mail.util.MailConnectException: Couldn't connect to host, port: smtp.gmail.com, 587; timeout -1;
nested exception is: java.net.ConnectException: Connection timed out: connect. Failed messages: com.sun.mail.util.MailConnectException: Couldn't connect to host, port: smtp.gmail.com, 587; timeout -1;
nested exception is:

Answer 1

spring.mail.properties.mail.smtp.connectiontimeout=5000 spring.mail.properties.mail.smtp.writetimeout=5000

try adding above two properties

Answer 2

The reason was my internet provider. I tried the same code in antoher one and it worked!