如何修复ClassNotFoundException:com。太阳邮政util。邮件记录器？

Question

我想发送电子邮件，我的代码如下

public static void main(String[] args) {

    final String username = "[e-mail]";
    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("[e-mail]"));
        message.setRecipients(Message.RecipientType.TO,
            InternetAddress.parse("[e-mail]"));
        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);
    }
}

xml

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

但有例外

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)

Answer 1

解决方案是使用正确的依赖关系。对于gradle：

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

Answer 2

这与java中的问题重复。lang.NoClassDefFoundError:com/sun/mail/util/MailLogger for JUnit Java mail测试用例和对我有用的答案：

        <dependency>
            <groupId>com.sun.mail</groupId>
            <artifactId>javax.mail</artifactId>
            <version>1.6.2</version>
        </dependency>

看见https://stackoverflow.com/a/16808343/1355930

Answer 3

尝试从以下更改：

<groupId>javax.mail</groupId>

收件人：

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