Attaching more than one file to an email - google-app-engine

Question

I have been struggling with this for a while and I could not find the answer for my problem.
The scenario is the following:
One web application using play framework lunched on Google app engine. Attempting to attach 2 pdf file to the email and send it. With one file it is working perfectly. With two I get errors.
Here is the code:
package app;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.Properties;
import javax.activation.DataHandler;
import javax.activation.DataSource;
import javax.activation.MimeType;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Multipart;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.AddressException;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;
import javax.mail.util.ByteArrayDataSource;
public class Mailer {
public static void sendEmail(String to, String subject, String body, byte[] pdf1, byte[] pdf2)
throws AddressException, MessagingException, UnsupportedEncodingException{
Properties props = new Properties();
Session session = Session.getDefaultInstance(props, null);
Message msg = new MimeMessage(session);
msg.setFrom(new InternetAddress("myAddress#gmail.com", "John Smith"));
msg.addRecipient(Message.RecipientType.TO, new InternetAddress(to, to));
msg.setSubject(subject);
msg.setText(body);
Multipart mp = new MimeMultipart();
MimeBodyPart htmlPart = new MimeBodyPart();
htmlPart.setContent(body, "text/html");
mp.addBodyPart(htmlPart);
//Attaching first pdf
MimeBodyPart attachment = new MimeBodyPart();
attachment.setFileName("pdf1.pdf");
DataSource src = new ByteArrayDataSource(pdf1, "application/pdf");
attachment.setDataHandler(new DataHandler(src));
mp.addBodyPart(attachment);
//Attaching second pdf
attachment = new MimeBodyPart();
attachment.setFileName("pdf2.pdf");
src = new ByteArrayDataSource(badgePDF, "application/pdf");
attachment.setDataHandler(new DataHandler(src));
mp.addBodyPart(attachment);
msg.setContent(mp);
Transport.send(msg);
}
}
Unfortunately I have no error message even if I print the caught exception's stackTrack, but I my guess is that there is an issue with the DataSource object. I appreciate any kind of help.

Answer 1

You should use FileDataSource for your DataSource type instead of using ByteArrayDataSource. Try the following:
Multipart mp = new MimeMultipart();
MimeBodyPart htmlPart = new MimeBodyPart();
htmlPart.setContent(body, "text/html");
mp.addBodyPart(htmlPart);
File[] attachments = new File[2];
atts[1] = new File("pdf1.pdf");
atts[2] = new File("pdf2.pdf");
for( int i = 0; i < attachments.length; i++ ) {
messageBodyPart = new MimeBodyPart();
FileDataSource fileDataSource =new FileDataSource(attachments[i]);
messageBodyPart.setDataHandler(new DataHandler(fileDataSource));
messageBodyPart.setFileName(attachments[i].getName());
mp.addBodyPart(messageBodyPart);
}
msg.setContent(mp);
Transport.send(msg);