MIME消息内容设置为null

Question

我正在尝试发送一封电子邮件，其中包含otp作为内容。没有得到什么问题，内容设置为空。

    public Boolean sendAdminLoginOtp(final CHEMRAdminLoginDetails details)
        throws CHEMRException {
    if (M_LOG.isDebugEnabled()) {
        M_LOG.debug("CHEMRMailerServiceImpl.sendOtpToUserForResetPassword");
    }
    try {
        final String fname = details.getFirstName();
        final String lname = details.getLastName();
        final Long otp = details.getOtp();
        final String email = details.getEmail();
        final Session emailSession = getEmailerSession();
        final Message message = new MimeMessage(emailSession);
        message.setFrom(new InternetAddress(
                m_mailerBundle.getString("emrMailerUserName")));
        message.setRecipients(Message.RecipientType.TO,
                InternetAddress.parse(email));
        message.setSubject("noreply-Mail");
        /*
         * message.setContent("Hi" + details.getFirstName() + " " +
         * details.getLastName() +
         * ".\n\nYour OTP to Login into your account : " + details.getOtp()
         * + "\n\n " + "\n\nThanks\nSupport Team", "text/plain");
         */
        
        message.setContent( "<p>Hi " + fname +" "+ lname + ", " 
                + "<br><br>Your OTP to Login into your account : " + otp
                + "<br><br>Thanks,Support Team.</p>", "text/html");
        Transport.send(message);
        return true;
    } catch (final Exception e) {
        final String[] replacmentObject = new String[] { e.getMessage() };
        M_LOG.error(
                "CHEMRMailerServiceImpl Failed to sendOtpToUserForResetPassword.."
                        + e.getMessage());
        final ErrorRecorder _errorRecorder = m_chemrServicesObjectFactory
                .getErrorRecorder();
        _errorRecorder.addError(CHEMRErrorCodes.EMRMAILER4001,
                replacmentObject);
        throw new CHEMRException("ERROR in Manager Layer ::",
                _errorRecorder.getErrors());
    }

}

上面的是我尝试过的代码

我经过调试，才知道内容设置为空。

以上是我得到的例外。希望有人可以帮助我