Javamail 传输错误

Question

我以前在几个项目中使用过 javamail，它一直运行良好，直到最近，(也许与升级到 java 8 有关？)现在它总是返回以下异常:

Exception in thread "main" javax.mail.MessagingException: Could not connect to SMTP host: smtp.gmail.com, port: 465;
  nested exception is:
    javax.net.ssl.SSLKeyException: RSA premaster secret error
    at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1963)
    at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:654)
    at javax.mail.Service.connect(Service.java:367)
    at javax.mail.Service.connect(Service.java:226)
    at javax.mail.Service.connect(Service.java:175)
    at javax.mail.Transport.send0(Transport.java:253)
    at javax.mail.Transport.send(Transport.java:124)
    at one.Demo.main(Demo.java:39)
Caused by: javax.net.ssl.SSLKeyException: RSA premaster secret error
    at sun.security.ssl.RSAClientKeyExchange.<init>(Unknown Source)
    at sun.security.ssl.ClientHandshaker.serverHelloDone(Unknown Source)
    at sun.security.ssl.ClientHandshaker.processMessage(Unknown Source)
    at sun.security.ssl.Handshaker.processLoop(Unknown Source)
    at sun.security.ssl.Handshaker.process_record(Unknown Source)
    at sun.security.ssl.SSLSocketImpl.readRecord(Unknown Source)
    at sun.security.ssl.SSLSocketImpl.performInitialHandshake(Unknown Source)
    at sun.security.ssl.SSLSocketImpl.startHandshake(Unknown Source)
    at sun.security.ssl.SSLSocketImpl.startHandshake(Unknown Source)
    at com.sun.mail.util.SocketFetcher.configureSSLSocket(SocketFetcher.java:528)
    at com.sun.mail.util.SocketFetcher.createSocket(SocketFetcher.java:333)
    at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:229)
    at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1927)
    ... 7 more
Caused by: java.security.NoSuchAlgorithmException: SunTlsRsaPremasterSecret KeyGenerator not available
    at javax.crypto.KeyGenerator.<init>(KeyGenerator.java:159)
    at javax.crypto.KeyGenerator.getInstance(KeyGenerator.java:208)
    at sun.security.ssl.JsseJce.getKeyGenerator(Unknown Source)
    ... 20 more

据我所知，错误似乎源自传输类的发送方法。这是我遇到的问题的 MCVE。它使用 Gmail stmp 服务器。

import java.util.Date;
import java.util.Properties;

import javax.mail.*;
import javax.mail.internet.*;

public class Demo {

  public static void main(String[] args) throws MessagingException {
    Properties props = new Properties();
    props.put("mail.smtp.host", "smtp.gmail.com");
    props.put("mail.smtp.port", 465);
    props.put("mail.smtp.ssl.enable", true);
    props.put("mail.smtp.auth", true);
    Authenticator auth = new Authenticator() {
      private PasswordAuthentication pa = new PasswordAuthentication(
        "my_email",
        "my_password");
      public PasswordAuthentication getPasswordAuthentication(){
        return pa;
      }
    };
    Session session = Session.getInstance(props, auth);
    session.setDebug(false);

    MimeMessage message = new MimeMessage(session);

    Address address = new InternetAddress("other_email");
    message.addRecipient(Message.RecipientType.TO, address);

    message.setFrom(new InternetAddress("my_email"));
    message.setSubject("Test");
    message.setText("This is a test of the Javamail API.");
    message.setSentDate(new Date());

    Transport.send(message);
  }

}

Answer 1

看看是否this post帮助。看起来有些问题与 JDK 的安装或配置有关。另外，您是否要通过代理服务器或防火墙？