将电子邮件发送到以下服务器失败（Apache Commons-Java）

Question

我正在尝试在Java程序中使用Apache Commons发送HTML电子邮件。 这是我的代码：

HtmlEmail email = new HtmlEmail();
email.setHostName("mail.axc.nl");
email.setSslSmtpPort("465");
email.setAuthenticator(new DefaultAuthenticator("username", "password"));
email.setSSLOnConnect(true);
email.addTo(emailadr, name);
email.setFrom("noreply@smartfix.me", "SmartFix");
email.setSubject("Subject");
email.setHtmlMsg("here goes my message");
email.send();

现在，这就像在台式机（运行Windows 8）上的超级按钮一样。 现在，在我的服务器（运行Windows Server 2012）上，它失败了。 它总是会出现以下异常：

Sending the email to the following server failed: mail.axc.nl:465

我检查了我的凭证十次，它们没有错。 我无法弄清楚为什么这在我的服务器上不起作用，尽管在我的桌面上也可以正常使用：S

更新：似乎每次编译并运行程序时都会发生错误。 当我的代码在netbeans中运行时，它就可以正常工作。 这是堆栈跟踪：

C:\inetpub\tracking>java.exe -jar SmartFixGUI.jar
SmartFix Tracking Terminal - loaded successfully.
Currently tracking null
71QJD73I3I is a smartphone.
Currently tracking 71QJD73I3I
71QJD73I3I is a smartphone.
org.apache.commons.mail.EmailException: Sending the email to the following serve
r failed : mail.axc.nl:465
        at org.apache.commons.mail.Email.sendMimeMessage(Email.java:1410)
        at org.apache.commons.mail.Email.send(Email.java:1437)
        at smartfixgui.trackingNumber.sendMail(trackingNumber.java:378)
        at smartfixgui.infoViewer.jButton2ActionPerformed(infoViewer.java:262)
        at smartfixgui.infoViewer.access$200(infoViewer.java:19)
        at smartfixgui.infoViewer$3.actionPerformed(infoViewer.java:149)
        at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
        at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
        at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
        at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
        at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Sour
ce)
        at java.awt.Component.processMouseEvent(Unknown Source)
        at javax.swing.JComponent.processMouseEvent(Unknown Source)
        at java.awt.Component.processEvent(Unknown Source)
        at java.awt.Container.processEvent(Unknown Source)
        at java.awt.Component.dispatchEventImpl(Unknown Source)
        at java.awt.Container.dispatchEventImpl(Unknown Source)
        at java.awt.Component.dispatchEvent(Unknown Source)
        at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
        at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
        at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
        at java.awt.Container.dispatchEventImpl(Unknown Source)
        at java.awt.Window.dispatchEventImpl(Unknown Source)
        at java.awt.Component.dispatchEvent(Unknown Source)
        at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
        at java.awt.EventQueue.access$200(Unknown Source)
        at java.awt.EventQueue$3.run(Unknown Source)
        at java.awt.EventQueue$3.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Sour
ce)
        at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Sour
ce)
        at java.awt.EventQueue$4.run(Unknown Source)
        at java.awt.EventQueue$4.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Sour
ce)
        at java.awt.EventQueue.dispatchEvent(Unknown Source)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
        at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
        at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
        at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
        at java.awt.EventDispatchThread.run(Unknown Source)
Caused by: javax.mail.MessagingException: IOException while sending message;
  nested exception is:
        javax.activation.UnsupportedDataTypeException: no object DCH for MIME ty
pe multipart/mixed;
        boundary="----=_Part_0_1999183509.1389954279345"
        at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:1182)
        at javax.mail.Transport.send0(Transport.java:254)
        at javax.mail.Transport.send(Transport.java:124)
        at org.apache.commons.mail.Email.sendMimeMessage(Email.java:1400)
        ... 41 more
Caused by: javax.activation.UnsupportedDataTypeException: no object DCH for MIME
 type multipart/mixed;
        boundary="----=_Part_0_1999183509.1389954279345"
        at javax.activation.ObjectDataContentHandler.writeTo(Unknown Source)
        at javax.activation.DataHandler.writeTo(Unknown Source)
        at javax.mail.internet.MimeBodyPart.writeTo(MimeBodyPart.java:1593)
        at javax.mail.internet.MimeMessage.writeTo(MimeMessage.java:1839)
        at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:1134)
        ... 44 more

更新2：似乎我的build.xml中可能有问题...运行jar的“未打包”版本（我的代码在jar中，而Apache / javax在单独的jar中，在lib文件夹中），一切工作正常。 当运行“组合发行版”（Apache，javax和我的代码打包在一个jar中）时，它出错了。

有人在我的build.xml中发现错误吗？ 我已经使用了一段时间了，从来没有任何问题：/

<?xml version="1.0" encoding="UTF-8"?>
<project name="SmartFixGUI" default="default" basedir=".">
    <description>Builds, tests, and runs the project SmartFixGUI.</description>
    <import file="nbproject/build-impl.xml"/>
<target name="-post-jar">
    <jar jarfile="dist/Combined-dist.jar">
    <zipfileset src="${dist.jar}" excludes="META-INF/*" />
    <zipfileset src="lib/commons-email-1.3.2.jar" excludes="META-INF/*" />
    <zipfileset src="lib/javax.mail.jar" excludes="META-INF/*" />
    <manifest>
        <attribute name="Main-Class" value="smartfixgui.main"/>
    </manifest>
  </jar>
</target>
</project>

Answer 1

感谢Gerald Schneider，我找到了解决方案。

进一步搜索DCH异常，发现在创建Email对象之前添加此代码可以解决该问题！

MailcapCommandMap mc = (MailcapCommandMap) CommandMap.getDefaultCommandMap();
        mc.addMailcap("text/html;; x-java-content-handler=com.sun.mail.handlers.text_html");
        mc.addMailcap("text/xml;; x-java-content-handler=com.sun.mail.handlers.text_xml");
        mc.addMailcap("text/plain;; x-java-content-handler=com.sun.mail.handlers.text_plain");
        mc.addMailcap("multipart/*;; x-java-content-handler=com.sun.mail.handlers.multipart_mixed");
        mc.addMailcap("message/rfc822;; x-java-content-handler=com.sun.mail.handlers.message_rfc822");
        CommandMap.setDefaultCommandMap(mc);