我使用 Spring Boot Mail Sender 得到了 SSLHandshakeException答案

【问题标题】：I got the SSLHandshakeException by using Spring Boot Mail Sender我使用 Spring Boot Mail Sender 得到了 SSLHandshakeException
【发布时间】：2020-10-29 09:03:21
【问题描述】：

我使用 Spring Boot Mail Sender API 得到了 SSLHandshakeException。我已经指定了我在下面编写的所有代码 sn-ps 和属性文件。我应该怎么做才能修复这个错误？

日志错误

Mail sending is started
Error occured: Mail server connection failed; nested exception is javax.mail.MessagingException: Could not convert socket to TLS;
  nested exception is:
    javax.net.ssl.SSLHandshakeException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target. Failed messages: javax.mail.MessagingException: Could not convert socket to TLS;
  nested exception is:
    javax.net.ssl.SSLHandshakeException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target

Process finished with exit code 0

应用程序属性

spring.mail.host=smtp.gmail.com
spring.mail.port=587
spring.mail.username= myemail
spring.mail.password= mypass
spring.mail.properties.mail.smtp.auth=true
spring.mail.properties.mail.smtp.starttls.enable=true

服务层

@Service
public class SendEmailService {

    @Autowired
    private JavaMailSender javaMailSender;

    public void sendEmail(String to, String body, String topic){
        try {
            System.out.println("Mail sending is started");
            SimpleMailMessage simpleMailMessage = new SimpleMailMessage();
            simpleMailMessage.setFrom("mail@mail.com");
            simpleMailMessage.setTo(to);
            simpleMailMessage.setSubject(topic);
            simpleMailMessage.setText(body);
            javaMailSender.send(simpleMailMessage);
            System.out.println("Mail sending is completed");
        }catch (Exception e){
            System.out.println("Error occured: "+e.getMessage());
        }
    }
}

SpringBootApplication 类

@SpringBootApplication
public class MailSenderApplication {

    @Autowired
    SendEmailService sendEmailService;

    public static void main(String[] args) {
        SpringApplication.run(MailSenderApplication.class, args);
    }

    @EventListener(ApplicationReadyEvent.class)
    public void triggerWhenStarts(){
        sendEmailService.sendEmail("mutlueren01@gmail.com","This e-mail has sending by Spring Boot","Spring Boot Mail Sender TEST");
    }
}

【问题讨论】：

标签： java spring spring-boot

【解决方案1】：

您需要将 SMTP 证书添加到 java 密钥库：How to import a .cer certificate into a java keystore?

或禁用证书检查（不推荐）：How to bypass ssl certificate checking in java

【讨论】：

【解决方案2】：

您可以将您的邮件服务提供商添加为受信任的：

spring.mail.properties.mail.smtp.ssl.trust=smtp.gmail.com

此行应添加到 application.properties 文件中。解决方案适用于 Java 11。

【讨论】：