通过javamail应用程序读取电子邮件时出错

Question

我正在尝试阅读电子邮件内容并通过我的Java应用程序打印内容。但是其拍摄没有初始内容异常错误。请指导。

我将其作为示例代码（https://docs.oracle.com/cd/E18930_01/html/821-2418/fwfiy.html）并尝试运行它。

    final String username = "username";
    final String password = "username"; 

    InitialContext ic = new InitialContext();
    String snName = "java:comp/env/mail/MyMailSession";
    Session session = (javax.mail.Session)ic.lookup(snName);

    Properties props = session.getProperties();
    props.put("mail.from", "abc@xyz.com");

    Store store = session.getStore();
    store.connect("smtpmail.de.xyz.com", username, password);

    Folder folder = store.getFolder("INBOX");
    Message[] messages = folder.getMessages();

    for (Message message : messages) {
        System.out.println(message.getDescription());
    }
}}

Exception in thread "main" javax.naming.NoInitialContextException: Need to specify class name in environment or system property, or as an applet parameter, or in an application resource file:  java.naming.factory.initial
    at javax.naming.spi.NamingManager.getInitialContext(Unknown Source)
    at javax.naming.InitialContext.getDefaultInitCtx(Unknown Source)
    at javax.naming.InitialContext.getURLOrDefaultInitCtx(Unknown Source)
    at javax.naming.InitialContext.lookup(Unknown Source)
    at EmailToString.main(EmailToString.java:23)