问Outlook :访问JavaMail时的NullPointerException

EN

public void readAllMsgsFromOutlook() throws FileNotFoundException, IOException, MessagingException

{
    //String host = "smtp-mail.outlook.com";

    String emailID = props.getEmail();
    String password = props.getPassword();
    Properties props = new Properties();

    props.setProperty("mail.store.protocol", "imaps");



    try {
        Session session = Session.getInstance(props, null);

        Store store = session.getStore("imaps");
        store.connect("imap-mail.outlook.com", emailID, password);
        Folder inbox = store.getFolder("INBOX");

        inbox.open(Folder.READ_ONLY);

        Message[] msgs = inbox.getMessages();

        System.out.println("Number of New Emails: " + msgs.length);


        for (int msgCounter = 0; msgCounter < msgs.length; msgCounter++) 

        {


            Message msg  = msgs[msgCounter];
            Address[] sender = msg.getFrom();
            Multipart mp =  (Multipart) msg.getContent(); // Throws null pointer exception 
            BodyPart bp = mp.getBodyPart(0);
            Date sentdate = msg.getSentDate();
            String subject = msg.getSubject();
            String content = bp.getContent().toString();


            System.out.println("SENDER: " + sender);
            System.out.println("SENT DATE: " + sentdate.getDate());
            System.out.println("SUBJECT: " + subject);
            System.out.println("CONTENT: " + content);

        }


    } catch (Exception mex) {
        // TODO Auto-generated catch block
        mex.printStackTrace();
    }

}

Number of New Emails: 2
java.lang.NullPointerException
    at javax.mail.internet.ParameterList.set(ParameterList.java:561)
    at com.sun.mail.imap.protocol.BODYSTRUCTURE.parseParameters(BODYSTRUCTURE.java:404)
    at com.sun.mail.imap.protocol.BODYSTRUCTURE.<init>(BODYSTRUCTURE.java:224)
    at com.sun.mail.imap.protocol.FetchResponse.parse(FetchResponse.java:158)
    at com.sun.mail.imap.protocol.FetchResponse.<init>(FetchResponse.java:67)
    at com.sun.mail.imap.protocol.IMAPResponse.readResponse(IMAPResponse.java:136)
    at com.sun.mail.imap.protocol.IMAPProtocol.readResponse(IMAPProtocol.java:270)
    at com.sun.mail.iap.Protocol.command(Protocol.java:313)
    at com.sun.mail.imap.protocol.IMAPProtocol.fetch(IMAPProtocol.java:1529)
    at com.sun.mail.imap.protocol.IMAPProtocol.fetch(IMAPProtocol.java:1521)
    at com.sun.mail.imap.protocol.IMAPProtocol.fetchBodyStructure(IMAPProtocol.java:1221)
    at com.sun.mail.imap.IMAPMessage.loadBODYSTRUCTURE(IMAPMessage.java:1307)
    at com.sun.mail.imap.IMAPMessage.getDataHandler(IMAPMessage.java:623)
    at javax.mail.internet.MimeMessage.getContent(MimeMessage.java:1454)
    at JavaMailAPI.readAllMsgsFromOutlook(JavaMailAPI.java:65)
    at Main.main(Main.java:163)