如何在NetBeans中查看完整的输出错误消息

Question

我成功地构建了我的代码，然后我有一个问题。

这是我的代码:

package EmailSending;
import java.util.*;
import javax.mail.*;
import javax.mail.internet.*;
import javax.activation.*;
public class launcher {
    public static void main(String[] args){
      final String username = "[e-mail]";
      final String password = "my-password";
      String to = "[e-mail]";
      String from = "[e-mail]";
      String host = "localhost";
      Properties properties = System.getProperties();
      properties.put("mail.smtp.auth", "true");
      properties.put("mail.smtp.starttls.enable", "true");
      properties.put("mail.smtp.host", host);
      Session session = Session.getInstance(properties);
      try{
         MimeMessage message = new MimeMessage(session);
         message.setFrom(new InternetAddress(from));
         message.addRecipient(Message.RecipientType.TO,
                                  new InternetAddress(to));
         message.setSubject("This is the Subject Line!");
         message.setText("This is actual message");
         Transport.send(message);
         System.out.println("Sent message successfully....");
      }catch (MessagingException mex) {
         mex.printStackTrace();
      }
   }
}

这行有一个错误:
Session session = Session.getInstance(properties);

这是一条输出消息:

run:
    Exception in thread "main" java.lang.NoClassDefFoundError: com/sun/mail/util/MailLogger
    at javax.mail.Session.initLogger(Session.java:227)
    at javax.mail.Session.<init>(Session.java:212)
    at javax.mail.Session.getInstance(Session.java:265)
    at EmailSending.launcher.main(launcher.java:34)
    Caused by: java.lang.ClassNotFoundException: com.sun.mail.util.MailLogger
    at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
    ... 4 more
Java Result: 1

我如何在NetBeans中观看完整的输出错误消息?如何扩大"……4多"?

Answer 1

如果您还没有弄清楚，那么该异常的原因是您没有将正确的JavaMail库添加到项目中。请看这个JavaMail FAQ条目。

如果您正在使用Maven，您可能希望引用这里列出的JavaMail的Maven坐标。你想要com.sun.mail:javax.mail.