java – Android Studio：NoClassDefFoundError

I'm trying to build an application that uses JavaMail and Gmail's SMTP service to send e-mail, but when I run it, it will crash when calling session.getinstance. After debugging, it looks like it's NoClassDefFoundError about com.sun.mail.util.maillogger. I read elsewhere. I have to add an older mail package to get it, But I still get errors

This is my content in Android Studio:

 // Get system properties
    Properties properties = System.getProperties();

    // Setup mail server
    properties.put("mail.smtp.host", host);
    properties.put("mail.smtp.auth", "true");
    properties.put("mail.smtp.starttls.enable", "true");
    properties.put("mail.transport.protocol","smtp");
    properties.put("mail.smtp.port", "587");

    authenticator = getAuthenticator();
    /* What getAuthenticator looks like:
    return new javax.mail.Authenticator() {
        protected PasswordAuthentication getpasswordAuthentication() {
            return new PasswordAuthentication("myemail@gmail.com ", "password");
        }
    };
    */

    // Get the default Session object, with authentication
    try {
        session = Session.getInstance(properties, authenticator);
    } catch (Error e) {
        // Unnecessary code for debugging
        int hold = 0;
    }

    // Create a default MimeMessage object.
    MimeMessage message = new MimeMessage(session);

    try {
        // Set From: header field of the header.
        message.setFrom(new InternetAddress(from));

        // Set To: header field of the header.
        message.addRecipient(Message.RecipientType.TO, new InternetAddress(to));

        // Set Subject: header field
        message.setSubject(subject);

        // Now set the actual message
        message.setText(content);

        // Send message
        Transport.send(message);
    } catch (AddressException e) {
        throw new Error("bad address");
    } catch (MessagingException e){
        throw new Error("bad message data");
    }

My build looks like this:

apply plugin: 'com.android.application'
android {
     compileSdkVersion 22
     buildToolsVersion "22.0.1"

     defaultConfig {
         applicationId "com.bsitpa.myfirstapp"
         minSdkVersion 15
         targetSdkVersion 22
         versionCode 1
         versionName "1.0"
     }
     buildTypes {
         release {
             minifyEnabled false
             proguardFiles getDefaultProguardFile('proguard-android.txt'),    'proguard-rules.pro'
         }
     }
     packagingOptions {
        exclude 'Meta-INF/LICENSE.txt'
     }
}

dependencies {
    compile fileTree(include: ['*.jar'], dir: 'libs')
    compile 'com.android.support:appcompat-v7:22.2.1'
    compile 'javax.mail:javax.mail-api:1.5.3'
    //compile 'javax.mail:mail:1.5.0-b01'
    compile files('mail-1.5.0-b01.jar')
}

Debugging error: "java.lang.noclassdeffounderror: parsing of LCOM / sun / mail / util / maillogger failed"

And you know, I'm completely unfamiliar with Android studio and gradle

Thank you very much, Ryan

resolvent:

I'm not sure if you've solved this problem, but I find you need to use the Android specific java mail library

compile 'com.sun.mail:android-mail:1.5.5'
compile 'com.sun.mail:android-activation:1.5.5'

I encountered your errors and other similar errors using the latest java mail library, but switching to these fixes all of them

https://java.net/projects/javamail/pages/Android