我正在开发一个应用程序，允许用户通过发送电子邮件与我联系（用户只输入消息，发送者和接收者的电子邮件都是我的）。我试图使用JavaMail API通过gmail实现这一点。但是，我在Transport.send(mimeMessage)行一直收到此错误。
以下是错误消息：
原因：java.lang.验证错误：拒绝尝试子类型化错误类com.sun.mail. handlers.handler_base的类com.sun.mail.handlers. text_plain（“com.sun.mail.handlers.text_plain”的声明出现在/data/app/~~T_TRkO9R_v9j4iEdr4K9Yg==/com.example. compusec-dPeAL 8DtGJvU 45 dJpt 8xxA ==/base.apk中）
原因：java.lang.验证错误：验证程序拒绝了类com.sun.mail.handlers.handler_base：无法验证以下内容：数据类型：[0x 4]无法解析返回的类型“未解析的引用：数据类型[]“或”引用：（“com.sun.mail.handlers.handler_base”的声明出现在/data/app/中）
下面是我的代码：

protected Void doInBackground(Void... voids) {
    Properties properties = new Properties();
    properties.put("mail.smtp.host", "smtp.gmail.com");
    properties.put("mail.smtp.socketFactory.port", "465");
    properties.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
    properties.put("mail.smtp.auth", "true");
    properties.put("mail.smtp.port", "465");

    session = javax.mail.Session.getInstance(properties, new javax.mail.Authenticator(){
        protected PasswordAuthentication getPasswordAuthentication(){
            return new PasswordAuthentication("sender@gmail.com","senderpass");
        }
    });

    session.setDebug(true);

    MimeMessage mimeMessage = new MimeMessage(session);
    try {
        mimeMessage.setFrom(new InternetAddress("sender@gmail.com"));
        mimeMessage.addRecipients(Message.RecipientType.TO, String.valueOf(new InternetAddress(email)));
        mimeMessage.setSubject(subject);
        mimeMessage.setText(message);
        Transport.send(mimeMessage);
    } catch (MessagingException e) {
        e.printStackTrace();
    }

    return null;
}

Gradle脚本：

plugins {
    id 'com.android.application'
}

android {
    compileSdkVersion 30
    buildToolsVersion "30.0.2"

    packagingOptions {
        pickFirst 'META-INF/LICENSE.txt' // picks the JavaMail license file
    }

    defaultConfig {
        applicationId "com.example.myapplication"
        minSdkVersion 23
        targetSdkVersion 30
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
}

repositories {
    jcenter()
    maven {
        url "https://maven.java.net/content/groups/public/"
    }
}

dependencies {

    implementation 'androidx.appcompat:appcompat:1.1.0'
    implementation 'com.google.android.material:material:1.1.0'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    compile 'com.sun.mail:android-mail:1.6.2'
    compile 'com.sun.mail:android-activation:1.6.2'
    testImplementation 'junit:junit:4.+'
    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
}