Question

我正在执行以下代码，以使用javamail在gmail上发送电子邮件。

import java.util.Properties;
import javax.mail.*;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;

public class JavaApplication1 {
    public static void main(String[] args) {
        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");

        Session session = Session.getDefaultInstance(props,
            new javax.mail.Authenticator() {
                protected PasswordAuthentication getPasswordAuthentication() {
                    return new PasswordAuthentication("goods.ramesh","mypassword");
                }
            });

        try {

            Message message = new MimeMessage(session);
            message.setFrom(new InternetAddress("goods.ramesh@gmail.com"));
            message.setRecipients(Message.RecipientType.TO,
                    InternetAddress.parse("goods.ramesh@yahoo.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);
        }
    }
}

但我收到以下错误：堆栈跟踪：

java.lang.ClassFormatError: Absent Code attribute in method that is not native or abstract in class file javax/mail/MessagingException
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:791)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
    at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
    at java.lang.Class.getDeclaredMethods0(Native Method)
    at java.lang.Class.privateGetDeclaredMethods(Class.java:2442)
    at java.lang.Class.getMethod0(Class.java:2685)
    at java.lang.Class.getMethod(Class.java:1620)
    at sun.launcher.LauncherHelper.getMainMethod(LauncherHelper.java:484)
    at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:476)
Exception in thread "main" Java Result: 1

我没有得到MessagingException正在做什么以及它为什么会发生。任何人都可以帮助我摆脱这种例外吗？

Answer 1

我有同样的ClassNotFound问题。我已经解决了以下POM设置

    <dependency>
        <groupId>javax</groupId>
        <artifactId>javaee-api</artifactId>
        <version>6.0</version>
        <type>jar</type>
        <scope>provided</scope>            
    </dependency> 

    <dependency>
        <groupId>org.glassfish.main.extras</groupId>
        <artifactId>glassfish-embedded-all</artifactId>
        <version>3.1.2</version>
    </dependency>

我在EJB UnitTesting中使用了这个版本的 glassfish-embedded-all ，所以我的理解是这个jar包含了Java EE API所需的所有类

Answer 2

您可能使用了不包含任何内容的错误版本的javaee.jar。

看一下这篇文章：http://www.mkyong.com/hibernate/java-lang-classformaterror-absent-code-attribute-in-method-that-is-not-native-or-abstract-in-class-file/

微米。

javamail无法正常工作。 MessagingException出现了

2 个答案: