Javamail无法将套接字转换为TLS GMail

Question

我正在尝试通过Gmail SMTP服务器使用JavaMail发送电子邮件。代码如下：

final String username = "[e-mail]";
final String password = "mygmailpassword";

Properties props = new Properties();
props.put("mail.smtp.auth", true);
props.put("mail.smtp.starttls.enable", true);
props.put("mail.smtp.host", "smtp.gmail.com");
props.put("mail.smtp.port", "587");

Session session = Session.getInstance(props,
    new javax.mail.Authenticator() {
        protected PasswordAuthentication getPasswordAuthentication() {
            return new PasswordAuthentication(username, password);
        }
    }
);

try {
    Message message = new MimeMessage(session);
    message.setFrom(new InternetAddress("[e-mail]"));
    message.setRecipients(Message.RecipientType.TO,
                        InternetAddress.parse("[e-mail]"));
    message.setSubject("Testing Subject");
    message.setText("Dear Mail Crawler," + "\n\n No spam to my email, please!");
    Transport.send(message);
    System.out.println("Done");
} catch (MessagingException e) {
    throw new RuntimeException(e);
}

返回此错误：

无法将套接字转换为TLS；

完整的堆栈跟踪：

异常线程"main"javax.mail.RuntimeException：ervice.connectMessagingException：无法将套接字转换为TLS；嵌套异常是：ervice.java:176SSLHandshakeException：sun.security.validator.ValidatorException： PKIX路径构建失败：sun.security.provider.certpath.SunCertPathBuilderException：无法找到有效的认证路径到请求的目标在Test.main（Tjavax.mail.）原因：ransport.sendMessagingException：无法将套接字转换为TLS；嵌套异常是：ransport.java:194SSLHandshakeException：javax.mail.ValidatorException： PKIX路径构建失败：ransport.sendSunCertPathBuilderException：无法找到有效的认证路径到请求的目标在ransport.java:124SMTPTest.mainTLS（SMTPTransport.java:1907）在com.sun.mail.smtp.SMTPTransport.protocolConnect（SMTPTransport.java:666）在javax.mail.Service.connect（Service.java:317）在java.lang.Sjavax.mail.（Sjavax.net.ssl.）在est.java:43Tjavax.mail.0（Tjavax.net.ssl.）在sun.security.validator.Tsun.security.provider.certpath.（Tcom.sun.mail.smtp.）在Transport.start（Test. java： 38）原因： javax. net. sssl. SSLHandshakeExceptionValidatorException：PKIX路径构建失败：sun. security. Provider. certpath。SunCertPathBuilderException：无法在com. sun. net. ssl.内在. ssl找到请求目标的有效认证路径。com. sun. net. ssl.内在. ssl的警报. getSSLException（Alerts. java： 174）。SSLSocketInp.致命的（SSLSocketInp. java： 1649）在com. sun. net. ssl.内在. sl。Handshaker.致命的（Handshaker. java： 241）在com. sun. net. ssl.内在. sl。Handshaker.致命的（Handshaker. java： 235）在com. sun. net. ssl.内在. ssl。ClientHandshaker. server证书（ClientHandshaker. java： 1206）在com. sun. net. slal. ssl。ClientHandshaker. Process消息（ClientHandshaker. jPKIXValidator. doBuild（PKIXValidator. java： 323）在sun. security. validator。PKIXValidator.工程验证（PKIXValidator. java： 217）在sun. security. validator. validator。验证（Validator. java： 218）在com. sun. net. ssl. interal. ssl。X509TrustManagerInp。验证（X509TrustManagerInp. java： 126）在com. sun. net. ssl. interl. ssl。X509TrustManagerInp. check ServerTrusted（X509TrustManagerInp. java： 209）在com. sun. net. ssl. interal. ssl。客户握手服务器

Answer 1

确保防病毒程序没有干扰，并确保在防火墙中添加排除。

Answer 2

我禁用了avast antivirus 10分钟，并使其正常工作。

Answer 3

props.put("mail.smtp.ssl.trust", "smtp.gmail.com");