IllegalArgumentException: Invalid character found in method name

Я новичек. Помогите исправить ошибку:

Дополняю. Вот код html-страницы:

<form action="ContactServlet" method="post">
    Name: <input name="name" />
    Email: <input name="email"type="email" />
    Message: <input name="message" />
    <input name="submit" type="submit" value="Отправить" />
</form>

И код сервлета:

public void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException {

    String name = request.getParameter("name");
    String email = request.getParameter("email");
    String message = request.getParameter("message");
    PrintWriter writer = response.getWriter();

    if(!message.equals(null)){
        String host = "smtp.gmail.com";
        int port = 587;
        String username = "[email protected]";
        String password = "***";

        Properties props = new Properties();
        props.put("mail.smtp.auth", "true");
        props.put("mail.smtp.starttls.enable", "true");
        Session session = Session.getDefaultInstance(props, null);

        String body = message;

        try {
            MimeMessage m = new MimeMessage(session);
            m.setSubject(name);
            m.setFrom(new InternetAddress(email, null));
            m.setText(body);
            m.addRecipient(MimeMessage.RecipientType.TO, new InternetAddress(username, "me"));


            Transport transport = session.getTransport("smtp");
            transport.connect(host, port, username, password);

            Transport.send(m);

        } catch (AddressException e) {
            e.printStackTrace();
        } catch (javax.mail.MessagingException e) {
            e.printStackTrace();
        }


        try {
            writer.println("Message send!");
        } finally {
            writer.close();
        }

    }
}

Ошибка: