java.lang.noclassdeffounderror：使用javax.mail jar时

Question

基本上，我正在尝试使用带有以下代码的mailgun发送电子邮件，它可以正常编译，但是在运行.class文件时出现以下错误：

  

错误：无法初始化主类EmailClient   原因：java.lang.NoClassDefFoundError：javax / mail / Message

我在同一目录中下载了activation.jar，javax.mail.jar，mail.jar文件，并将编译参数设置为javac EmailClient.java -cp .:activation.jar:javax.mail.jar:mail.jar和java EmailClient -cp .:activation.jar:javax.mail.jar:mail.jar，但仍然出现错误。 / p>

我的代码：

import javax.mail.*;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import java.util.Properties;

public class EmailClient {
  private static final String senderEmail = "test@logicbig.com";//change with your sender email
  private static final String senderPassword = "12345678";//change with your sender password

  public static void sendAsHtml(String to, String title, String html) throws MessagingException {
  System.out.println("Sending email to " + to);

  Session session = createSession();

  //create message using session
  MimeMessage message = new MimeMessage(session);
  prepareEmailMessage(message, to, title, html);

  //sending message
  Transport.send(message);
  System.out.println("Done");
  }

  private static void prepareEmailMessage(MimeMessage message, String to, String title, String html)
      throws MessagingException {
  message.setContent(html, "text/html; charset=utf-8");
  message.setFrom(new InternetAddress(senderEmail));
  message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(to));
  message.setSubject(title);
  }

  private static Session createSession() {
  Properties props = new Properties();
  props.put("mail.smtp.auth", "true");//Outgoing server requires authentication
  props.put("mail.smtp.starttls.enable", "true");//TLS must be activated
  props.put("mail.smtp.host", "smtp.1and1.com"); //Outgoing server (SMTP) - change it to your SMTP server
  props.put("mail.smtp.port", "587");//Outgoing port

  Session session = Session.getInstance(props, new javax.mail.Authenticator() {
      protected PasswordAuthentication getPasswordAuthentication() {
          return new PasswordAuthentication(senderEmail, senderPassword);
      }
  });
  return session;
  }

  public static void main(String[] args) throws MessagingException {
  EmailClient.sendAsHtml("testreceiver10@gmail.com",
          "Test email",
          "<h2>Java Mail Example</h2><p>hi there!</p>");
  }
}