JavaMail的傳輸錯誤

Question

我已經在多個項目中使用的JavaMail之前，它一直運作良好，直到最近，（也許一些與升級做java的8？），當它現在總是返回以下異常：

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 

從我所做的看來，錯誤是由傳輸類的send方法派生的。這是我遇到的問題的一個MCVE。它使用Gmail stmp服務器。

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this post有幫助。它看起來像是有關安裝或配置JDK的一些問題。另外，你是否正在通過代理服務器或防火牆？