我在这里和其他地方搜索了几个相关的帖子，但没有一个解决了我的问题。我有一个程序使用“javamail API”向一组人发送电子邮件。它工作得很好。今天我再次需要，但我无法发送任何电子邮件...我的sendEmail方法如下：
public void sendEmail(String userName, String password, String toAddress,
String subject, String message, String[] attachFiles)
throws AddressException, MessagingException {
// sets SMTP properties
Properties properties = new Properties();
properties.put("mail.smtp.host", "smtp.gmail.com");
properties.put("mail.smtp.port", "587");
properties.put("mail.smtp.auth", "true");
properties.put("mail.smtp.starttls.enable", "true");
properties.put("mail.user", userName);
properties.put("mail.password", password);
// creates a new session with an authenticator
Authenticator auth = new SMTPAuthenticator(userName, password);
Session session = Session.getInstance(properties, auth);
// creates a new e-mail message
MimeMessage msg = new MimeMessage(session);
try {
msg.setFrom(new InternetAddress(userName, "My name"));
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
InternetAddress[] toAddresses = {new InternetAddress(toAddress)};
msg.setRecipients(Message.RecipientType.TO, toAddresses);
msg.setSubject(subject);
msg.setSentDate(new Date());
// creates message part
MimeBodyPart messageBodyPart = new MimeBodyPart();
messageBodyPart.setContent(message, "text/html");
// creates multi-part
Multipart multipart = new MimeMultipart();
multipart.addBodyPart(messageBodyPart);
// adds attachments
if (attachFiles != null && attachFiles.length > 0) {
for (String filePath : attachFiles) {
addAttachment(multipart, filePath);
}
}
// sets the multi-part as e-mail's content
msg.setContent(multipart);
// sends the e-mail
Transport.send(msg);
}
所以，现在尝试调用此方法我得到以下错误 （我正在使用jdk 1.7.0_21）：
Sending email Failed...
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: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 EmailSender.sendEmail(EmailSender.java:86)
at CFP_LaWasp_EmailSender.sendCFPLaWasp(CFP_LaWasp_EmailSender.java:178)
at CFP_LaWasp_EmailSender.main(CFP_LaWasp_EmailSender.java:220)
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:528)
at com.sun.mail.util.SocketFetcher.startTLS(SocketFetcher.java:465)
at com.sun.mail.smtp.SMTPTransport.startTLS(SMTPTransport.java:1902)
... 9 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)
... 19 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)
... 25 more
我不知道如何解决这个问题，因为之前它曾经工作过...而且，我不知道我的Gmail是否与此有关（如果它阻止了此访问...）< / p>
我感谢任何帮助。
答案 0 :(得分：31)
关键错误是：
引起：sun.security.provider.certpath.SunCertPathBuilderException：无法找到所请求目标的有效证书路径
由于您要连接到Gmail，因此不应该这样。最可能的原因是：
答案 1 :(得分：6)
我一直在努力解决这个错误几个小时。我尝试使用Bil Shannon提供的答案安装服务器证书。没有任何效果。
我的问题是AVAST Antivirus。一旦我禁用了Avast Mail Shield，我就可以通过我的网络应用程序通过gmail帐户发送邮件。
答案 2 :(得分：3)
我在java 8中遇到了这个问题。更新此属性后问题解决了
properties.put（＆＃34; mail.smtp.ssl.trust＆＃34;，＆＃34; smtp.gmail.com＆＃34;）
如果在application.property中使用spring boot
spring.mail.properties.mail.smtp.ssl.trust = smtp.gmail.com
答案 3 :(得分：0)
我的问题已解决：
properties.put("mail.smtp.ssl.trust", "smtp.gmail.com")
当我使用Spring Boot时
spring.mail.properties.mail.smtp.ssl.trust = smtp.gmail.com