How can I fix ClassNotFoundException: com.sun.mail.util.MailLogger?

问题

I want to send email, My code is below

public static void main(String[] args) {

    final String username = "emailId@gmail.com";
    final String password = "password";

    Properties props = new Properties();
    props.put("mail.smtp.auth", "true");
    props.put("mail.smtp.starttls.enable", "true");
    props.put("mail.smtp.host", "smtp.gmail.com");
    props.put("mail.smtp.port", "587");

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

    try {

        Message message = new MimeMessage(session);
        message.setFrom(new InternetAddress("from-email@gmail.com"));
        message.setRecipients(Message.RecipientType.TO,
            InternetAddress.parse("email1@google.com"));
        message.setSubject("Testing Subject");
        message.setText("Dear Mail Crawler,"
            + "\n\n No spam to my email, please!");

        Transport.send(message);

        System.out.println("Done");

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

POM.xml

<dependency>
    <groupId>javax.mail</groupId>
    <artifactId>javax.mail-api</artifactId>
    <version>1.5.5</version>
</dependency>

But getting exception

Exception in thread "main" java.lang.NoClassDefFoundError: com/sun/mail/util/MailLogger
at javax.mail.Session.initLogger(Session.java:230)
at javax.mail.Session.<init>(Session.java:214)
at javax.mail.Session.getInstance(Session.java:251)
at com.smart21.spring.utils.MailTest.main(MailTest.java:26)
Caused by: java.lang.ClassNotFoundException: com.sun.mail.util.MailLogger
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)

回答1:

Try changing from:

<groupId>javax.mail</groupId>

to:

<groupId>com.sun.mail</groupId>

回答2:

The solution is to use correct dependency. For gradle:

// https://mvnrepository.com/artifact/javax.mail/mail
compile group: 'javax.mail', name: 'mail', version: '1.5.0-b01'

回答3:

Try taking activation.jar and mail.jar from the Oracle website. This would help you resolve the error ClassNotFoundException: com.sun.mail.util.MailLogger.

来源：https://stackoverflow.com/questions/45311884/how-can-i-fix-classnotfoundexception-com-sun-mail-util-maillogger

标签

java

javamail