java.lang.NoClassDefFoundError:javax.activation.DataHandler [英] java.lang.NoClassDefFoundError: javax.activation.DataHandler

问题描述

我的android项目遇到了问题，基本上我正在尝试发送电子邮件并收到错误消息:

I'm facing a problem with my android project, basically I'm trying to send an email and got the error:

public class ConnectEmail {
    private Session session;
    private Properties properties;
    private final String password;
    private final String username;

    public ConnectEmail(String username, String password) {
        this.username = username;
        this.password = password;
    }

    public boolean getSession() {
        boolean result = false;
        properties = getProperties();
        try {
            session = Session.getDefaultInstance(properties,
                    new javax.mail.Authenticator() {
                        protected PasswordAuthentication getPasswordAuthentication() {
                            return new PasswordAuthentication(username,
                                    password);
                        }
                    });
            Log.i("Check", "Got session");
            result = true;
        } catch (Exception e) {
            System.out.println(e.toString() + "Session: Unknown Exception");
        }

        return result;
    }

    public Properties getProperties() {

        Properties props = new Properties();
        props.put("mail.smtp.host", "smtp.gmail.com");
        props.put("mail.smtp.socketFactory.port", "465");
        props.put("mail.smtp.socketFactory.class",
                "javax.net.ssl.SSLSocketFactory");
        props.put("mail.smtp.auth", "true");
        props.put("mail.smtp.port", "465");
        Log.i("Check", "Got properties");
        return props;
    }

    public void sendEmail(String recipients, String subject, String content) {
        String finalString = "";

        boolean result = getSession();

        if (result) {
            try {
                Message message = new MimeMessage(session);
                message.setFrom(new InternetAddress(username));
                message.setDataHandler(handler);
                Log.i("Check", "creating message");

                message.setRecipients(Message.RecipientType.TO,
                        InternetAddress.parse(recipients));
                message.setSubject(subject);
                message.setText(content);

                 Log.i("check", "transport");
                    Transport transport = session.getTransport("smtp");
                    Log.i("check", "connecting");
                    transport.connect("smtp.gmail.com",username , password);
                    Log.i("check", "wana send");
                    transport.sendMessage(message, message.getAllRecipients());
                    transport.close();

                    Log.i("check", "sent");



            } catch (MessagingException e) {
                throw new RuntimeException(e);

        }} else
            System.out.println("Invalid session...");

    }
}

我的LogCat说:

11-16 15:33:38.000: E/AndroidRuntime(19426): FATAL EXCEPTION: main
11-16 15:33:38.000: E/AndroidRuntime(19426): java.lang.NoClassDefFoundError: javax.activation.DataHandler
11-16 15:33:38.000: E/AndroidRuntime(19426):    at javax.mail.internet.MimeMessage.setContent(MimeMessage.java:1454)
11-16 15:33:38.000: E/AndroidRuntime(19426):    at javax.mail.internet.MimeBodyPart.setText(MimeBodyPart.java:1075)
11-16 15:33:38.000: E/AndroidRuntime(19426):    at javax.mail.internet.MimeMessage.setText(MimeMessage.java:1493)
11-16 15:33:38.000: E/AndroidRuntime(19426):    at javax.mail.internet.MimeMessage.setText(MimeMessage.java:1477)
11-16 15:33:38.000: E/AndroidRuntime(19426):    at com.example.emailontime.control.ConnectEmail.sendEmail(ConnectEmail.java:83)
11-16 15:33:38.000: E/AndroidRuntime(19426):    at com.example.emailontime.activities.LoginActivity$1.onClick(LoginActivity.java:45)
11-16 15:33:38.000: E/AndroidRuntime(19426):    at android.view.View.performClick(View.java:4211)
11-16 15:33:38.000: E/AndroidRuntime(19426):    at android.view.View$PerformClick.run(View.java:17362)
11-16 15:33:38.000: E/AndroidRuntime(19426):    at android.os.Handler.handleCallback(Handler.java:725)
11-16 15:33:38.000: E/AndroidRuntime(19426):    at android.os.Handler.dispatchMessage(Handler.java:92)
11-16 15:33:38.000: E/AndroidRuntime(19426):    at android.os.Looper.loop(Looper.java:137)
11-16 15:33:38.000: E/AndroidRuntime(19426):    at android.app.ActivityThread.main(ActivityThread.java:5227)
11-16 15:33:38.000: E/AndroidRuntime(19426):    at java.lang.reflect.Method.invokeNative(Native Method)
11-16 15:33:38.000: E/AndroidRuntime(19426):    at java.lang.reflect.Method.invoke(Method.java:511)
11-16 15:33:38.000: E/AndroidRuntime(19426):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:795)
11-16 15:33:38.000: E/AndroidRuntime(19426):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:562)
11-16 15:33:38.000: E/AndroidRuntime(19426):    at dalvik.system.NativeStart.main(Native Method)

我看到了一些问题，人们通常说问题出在构建路径中，我试图重新安装mail.jar，清理项目，但什么也没做. 谢谢.

I saw some questions and people usually says that the problem is in the build path, I tried to reinstall the mail.jar, clean the project but nothing. Thanks.

推荐答案

Android不是Java.请向Google投诉.告诉他们Android应该与Java兼容.

Android isn't Java. Please complain to Google. Tell them that Android should be Java Compatible.

同时，如果您添加了 additionnal.jar 和此处)，但仍无法正常工作，说明您做错了事.

In the mean time, if you've added additionnal.jar and activation.jar to your application (as described here) and it's still not working, you're doing something wrong.

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