我在james中注册的用户名是admin,密码是admin。为什么运行接收邮件报Authentication failed错误，已经找了好久的原因，一直没解决，邮件系统继续不下去了。望高手予以解答。谢谢。
完整代码如下：
public class ReceiveMail {
public static void getMail(){   
    String host = "localhost";   
    final String username = "admin";   
    final String password = "admin";   

    // 创建Properties 对象   
    Properties props = new Properties();   

    // 创建邮件会话   
    Session session = Session.getDefaultInstance(props, new Authenticator(){      
        public PasswordAuthentication getPasswordAuthentication() {   
            return new PasswordAuthentication(username, password);   
        }   
            
    });   

        
    try {   
        // 获取邮箱的pop3存储   
        Store store = session.getStore("pop3");   
        store.connect(host, username, password);   

        // 获取inbox文件   
        Folder folder = store.getFolder("INBOX");   
        folder.open(Folder.READ_ONLY);  //打开，打开后才能读取邮件信息   

        // 获取邮件消息   
        Message message[] = folder.getMessages();   

        for (int i=0, n=message.length; i<n; i++) {   
            System.out.println(i + ": " + message[i].getFrom()[0]   
                                           + "\t" + message[i].getSubject());   
            try {   
                message[i].writeTo(System.out);   
            } catch (IOException e) {   
                e.printStackTrace();   
            }   

        }   

        // 关闭资源   
        folder.close(false);   
        store.close();   
            
    } catch (MessagingException e) {   
        e.printStackTrace();   
    }   
        
    System.out.println("GetMail Process Over!");   

}   


public static void main(String[] args) {
    ReceiveMail.getMail();
}
}

怎么没人回复啊。