App Engine Services - Beginning Java Google App Engine - page 190

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The Mail service works only on deployed App Engine applications. The code in
Listing 8-12, which you'll be using in this demonstration, will not send an e-mail
running locally on the development server. You're going to use the same Eclipse
project you used for the previous examples in this chapter. Create a new Java class
called MailServlet.java . Copy the code from Listing 8-12 to the new servlet.

Listing 8-12. MailServlet.java

package com.kyleroche.gaeservices;

import java.io.IOException;
import java.util.Properties;

import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.AddressException;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;