Message listener sending e-mails

MailingListener.java

package org.ubdynamics.testapp.ejb.service;

import java.io.ByteArrayOutputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Locale;

import javax.activation.DataHandler;
import javax.activation.DataSource;
import javax.annotation.Resource;
import javax.ejb.ActivationConfigProperty;
import javax.ejb.EJB;
import javax.ejb.MessageDriven;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageListener;
import javax.jms.ObjectMessage;
import javax.mail.MessagingException;
import javax.mail.Session;
import javax.mail.Transport;
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;

import jxl.Workbook;
import jxl.WorkbookSettings;
import jxl.write.Label;
import jxl.write.Number;
import jxl.write.WritableSheet;
import jxl.write.WritableWorkbook;
import jxl.write.WriteException;
import jxl.write.biff.RowsExceededException;

import org.ubdynamics.testapp.ejb.type.MailRequest;
import org.ubdynamics.testapp.jpa.entity.User;
import org.ubdynamics.testapp.jpa.entity.Document;

/**
 * Message-Driven Bean implementation class for: MailingListener
 * 
 */
@MessageDriven(mappedName = "jms/TestQ", activationConfig = 
  { 
		@ActivationConfigProperty(propertyName = "destinationType", 
			propertyValue = "javax.jms.Queue") 
	}
)
public class MailingListener implements MessageListener {

	@EJB
	private GeneralService generalService;

	@Resource(mappedName = "mail/TestSession")
	private Session mailSession;

	public MailingListener() {
		System.out.println("Listener starting...");
	}

	public void onMessage(Message message) {

		System.out.println("Got message: " + message);

		MailRequest mailRequest;

		try {
			mailRequest = (MailRequest) ((ObjectMessage) message)
					.getObject();
		} catch (JMSException e) {
			System.out.println(e);
			return;
		}

		User user = mailingRequest.getUser();

		List<Document> documents = new ArrayList<Document>();

		Document document;

		try {
			document = getDocument(user);
		} catch (RowsExceededException e) {
			System.out.println(e);
			return;
		} catch (FileNotFoundException e) {
			System.out.println(e);
			return;
		} catch (WriteException e) {
			System.out.println(e);
			return;
		} catch (IOException e) {
			System.out.println(e);
			return;
		}

		documents.add(document);

		OutgoingMail outgoingMail = new OutgoingMail();

		String body = "Dear " + user.getName();
		body += "\n\n";
		body += "We are hereby attaching document ";
		body += "\n\n";

		outgoingMail.setTitle("Mail subject");
		outgoingMail.setContent(body);
		outgoingMail.setReceiver(user.getEmail());
		outgoingMail.setAttachments(documents);

		try {

			System.out.println("Mail session: " + mailSession);

			MimeMessage mailMessage = new MimeMessage(mailSession);

			mailMessage.setFrom(new InternetAddress(mailSession
					.getProperty("mail.from")));
			mailMessage.setRecipients(javax.mail.Message.RecipientType.TO,
					InternetAddress.parse(outgoingMail.getReceiver()));
			mailMessage.setSubject(outgoingMail.getTitle());

			MimeMultipart messageParts = new MimeMultipart();

			MimeBodyPart textPart = new MimeBodyPart();
			textPart.setText(outgoingMail.getContent());

			messageParts.addBodyPart(textPart);

			List<Document> attachments = outgoingMail.getAttachments();

			for (Document attachment : attachments) {

				DataSource dataSource = new ByteArrayDataSource(
						attachment.getContent(), attachment.getContentType());

				MimeBodyPart attachmentPart = new MimeBodyPart();
				attachmentPart.setDataHandler(new DataHandler(dataSource));
				attachmentPart.setFileName(attachment.getName());
				messageParts.addBodyPart(attachmentPart);
			}

			mailMessage.setContent(messageParts);

			Transport.send(mailMessage);

			System.out.println("Done");

		} catch (MessagingException e) {

			System.out.println(e);
		}

		System.out.println(outgoingMail);
	}

	private Document getDocument(User user) throws FileNotFoundException,
			IOException, RowsExceededException, WriteException {

		ByteArrayOutputStream outputStream = new ByteArrayOutputStream();

		WorkbookSettings wbSettings = new WorkbookSettings();
		wbSettings.setLocale(new Locale("en", "EN"));

		WritableWorkbook workbook = Workbook.createWorkbook(outputStream,
				wbSettings);

		workbook.createSheet("Sheet 1", 0);

		WritableSheet excelSheet = workbook.getSheet(0);

		// TODO Populate Excel document

		workbook.write();
		workbook.close();

		Document document = new Document();

		document.setName(user.getUsername() + ".xls");
		document.setCreatedDate(new Date());
		document.setContent(outputStream.toByteArray());
		document.setContentType("application/octet-stream");

		return document;

	}

}