我在另一个stackoverflow线程中找到了这个代码的基础（肯定会引用我的项目但是留在学校的url）并且得到的代码在学校计算机上完美地工作（使用587端口）然而当我在同一软件（JCreator）上尝试相同的代码，该程序不再工作，并给出此错误：
<pre> <code>
--------------------Configuration: <Default>--------------------
Exception in thread "main" java.lang.RuntimeException: javax.mail.MessagingException: Could not convert socket to TLS;
nested exception is:
javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
at SendEmail.<init>(SendEmail.java:86)
at SendEmail.main(SendEmail.java:93)
Caused by: javax.mail.MessagingException: Could not convert socket to TLS;
nested exception is:
javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
at com.sun.mail.smtp.SMTPTransport.startTLS(SMTPTransport.java:1907)
at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:666)
at javax.mail.Service.connect(Service.java:317)
at javax.mail.Service.connect(Service.java:176)
at javax.mail.Service.connect(Service.java:125)
at javax.mail.Transport.send0(Transport.java:194)
at javax.mail.Transport.send(Transport.java:124)
at SendEmail.<init>(SendEmail.java:78)
... 1 more
Caused by: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
at sun.security.ssl.Alerts.getSSLException(Alerts.java:192)
at sun.security.ssl.SSLSocketImpl.fatal(SSLSocketImpl.java:1886)
at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:276)
at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:270)
at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1341)
at sun.security.ssl.ClientHandshaker.processMessage(ClientHandshaker.java:153)
at sun.security.ssl.Handshaker.processLoop(Handshaker.java:868)
at sun.security.ssl.Handshaker.process_record(Handshaker.java:804)
at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:1016)
at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1312)
at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1339)
at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1323)
at com.sun.mail.util.SocketFetcher.configureSSLSocket(SocketFetcher.java:549)
at com.sun.mail.util.SocketFetcher.startTLS(SocketFetcher.java:486)
at com.sun.mail.smtp.SMTPTransport.startTLS(SMTPTransport.java:1902)
... 8 more
Caused by: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
at sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:385)
at sun.security.validator.PKIXValidator.engineValidate(PKIXValidator.java:292)
at sun.security.validator.Validator.validate(Validator.java:260)
at sun.security.ssl.X509TrustManagerImpl.validate(X509TrustManagerImpl.java:326)
at sun.security.ssl.X509TrustManagerImpl.checkTrusted(X509TrustManagerImpl.java:231)
at sun.security.ssl.X509TrustManagerImpl.checkServerTrusted(X509TrustManagerImpl.java:126)
at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1323)
... 18 more
Caused by: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
at sun.security.provider.certpath.SunCertPathBuilder.engineBuild(SunCertPathBuilder.java:196)
at java.security.cert.CertPathBuilder.build(CertPathBuilder.java:268)
at sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:380)
... 24 more
Process completed.
</code> </pre>
如果它更容易，这就是代码。代码最初出现在一个巨大的main方法中但是我试图改变它以便有一个方法（没有工作）所以我做了一个巨大的构造函数......是吗？此外，它使用Java API
<pre> <code>
import java.io.UnsupportedEncodingException;
import java.util.Properties;
import javax.mail.*;
import javax.mail.internet.*;
import javax.activation.*;
import javax.swing.*;
import java.util.*;
import java.io.*;
/**
SendEmail Class
By: Jana Dbouk
June 06, 2014
ICS 4U0 - Mr. Campos
SendEmail Class Functions:
* Volunteer student enters custom email message
* Program sends email to Mr. Makridis
* Self Testing Main Method
*/
public class SendEmail
{
public SendEmail ()
{
final String username = "jaebear.x0@gmail.com";
final String password = "sugarcakes";
String host = "smtp.gmail.com";
// Connects to the email host
Properties emailProperties = new Properties ();
emailProperties .put("mail.smtp.starttls.enable", "true");
emailProperties.put("mail.smtp.host", host);
emailProperties.put("mail.smtp.user", username);
emailProperties.put("mail.smtp.password", password);
emailProperties.put("mail.smtp.port", "587");
emailProperties .put("mail.smtp.auth", "true");
// Checks to see if student volunteer's email/password are correct
Session session = Session.getInstance (emailProperties,
new javax.mail.Authenticator ()
{
protected PasswordAuthentication getPasswordAuthentication ()
{
return new PasswordAuthentication (username, password);
}
}
);
// Send a email to the teacher
try
{
Message emailToTeacher = new MimeMessage (session);
// Volunteer student's email
emailToTeacher.setFrom (new InternetAddress ("jaebear.x0@gmail.comm"));
// Teacher's email
emailToTeacher.setRecipients (Message.RecipientType.TO,
InternetAddress.parse ("acentius@outlook.com"));
// Subject Title
emailToTeacher.setSubject ("New Email from Breakfast Club");
// Text within email
String emailMessage = JOptionPane.showInputDialog ("Enter the email message.");
emailToTeacher.setText (emailMessage);
// Sends emailToTeacher to teacher
Transport.send (emailToTeacher);
// Let's the student know the emailToTeacher has been sent
JOptionPane.showMessageDialog (null, "Email successfully sent to Mr. Makridis.");
}
catch (MessagingException e)
{
throw new RuntimeException (e); // Error message
}
} // Self testing main method
public static void main (String[] args)
{
new SendEmail ();
}
} </code> </pre>
答案 0 :(得分：2)
这是证书错误，而不是代码错误。
几年前我写了一篇关于它的博客文章：