Calendaring body being ignored of more than one mail sent out via threaded mailer

[Iain Emsley]

I'm trying to send a calendaring email to a group of people via a threaded mailer and for some reason I can get the first email coming out with the relevant ics headers seen in MS Outlook 2007 but any subsequent emails are seen as plain text and the calendaring part of the mime message is ignored. Is there anything that I am missing or doing incorrectly? Thanks in advance for any pointers.

The mail Entity that is called by the programme:

public void init(boolean debug) throws CalFacadeException {
    this.debug = debug;

    Properties props = new Properties();
    getConfig();

    props.put("mail." + config.getProtocol() + ".class", config.getProtocolClass());
    props.put("mail." + config.getProtocol() + ".host", config.getServerIp());

    //  add handlers for main MIME types
    MailcapCommandMap mc = (MailcapCommandMap)CommandMap.getDefaultCommandMap();
    mc.addMailcap("text/html;; x-java-content-handler=com.sun.mail.handlers.text_html");
    mc.addMailcap("text/xml;; x-java-content-handler=com.sun.mail.handlers.text_xml");
    mc.addMailcap("text/plain;; x-java-content-handler=com.sun.mail.handlers.text_plain");
    mc.addMailcap("text/calendar;; x-java-content-handler=com.sun.mail.handlers.text_html");
    mc.addMailcap("multipart/*;; x-java-content-handler=com.sun.mail.handlers.multipart_mixed");
    mc.addMailcap("message/rfc822;; x-java-content-handler=com.sun.mail.handlers.message_rfc822");
    CommandMap.setDefaultCommandMap(mc); 

    sess = Session.getInstance(props);
    sess.setDebug(debug);
    
  }

  /* 
   * mailEntity(net.fortuna.ical4j.model.Calendar, java.lang.String, java.util.Collection, java.lang.String)
   */
  
  public boolean mailEntity(Calendar cal,
                            String originator,
                            Collection<String>recipients,
                            String subject) throws CalFacadeException {
	  
	  Connection conn = null;
	  Statement stmt = null;
	  
	  pool = Executors.newFixedThreadPool(10);
	  
	  String recip = null;
	  String split = null;
	  
	  if (debug) {
        debugMsg("mailEntity called with " + cal);
      }

      getConfig();

      if (config.getDisabled()) {
         return false;
      }

      try {

    	  Iterator it = recipients.iterator();
          while (it.hasNext()) {
    	     recip = it.next().toString();

    	    conn = DriverManager.getConnection("jdbc:apache:commons:dbcp:");;
    	    stmt = conn.createStatement();
    	    ResultSet rs = stmt.executeQuery("SELECT user FROM name WHERE name='" + recip +"'"); 
    	  
            String domain = "foo.com";

             if (originator == null) {
	      	 originator = config.getFrom();
	      	 }
	      if (subject == null) {
	      	 subject = config.getSubject();
	      	 }
	      tr = sess.getTransport(config.getProtocol());      
	      String[] splitting = recip.split("@");
    	      split = splitting[1];
    	      if (split.equals(domain)) {
    	         while (rs.next()) {
        	    pool.submit(new buildMail(sess, cal, originator, rs.getString(1), subject, tr));
    	            }
    	         rs.close();  
    	      } else {          
    	      pool.submit(new buildMail(sess, cal, originator, recip, subject, tr));  
    	      }
            }	  	
      } catch (Throwable t) {
    	   if (debug) {
    	     t.printStackTrace();
    	   }
    	    throw new CalFacadeException(t);
    	 } finally {
    		 try {
    		    stmt.close();
   	            conn.close();
    		 } catch (Exception e) {
    			 e.printStackTrace();
    		 }
    	 }
     return true;
  } 

and the callable() is section is:

public MimeMessage call() {		
		try {

			//iterating through the members array to create individual messages for sendMessage
			msg = new MimeMessage(sess);
                       msg.addHeaderLine("text/calendar;method=REQUEST;charset=\"UTF-8\"");
			msg.setFrom(new InternetAddress(from));
		      	      
		      	msg.setRecipient(javax.mail.Message.RecipientType.TO, new InternetAddress(to));
	        	msg.setSubject(subject);
		      	msg.setSentDate(new Date());

		      	Multipart multipart = new MimeMultipart();
		      	
		      	 //added in to prevent spam filters thinking this is spam due to no text body. 
		        MimeBodyPart textBodyPart = new MimeBodyPart();
		     	String textBody = "This email is a scheduling event from " + from;
		      	textBodyPart.setText(textBody);
		        multipart.addBodyPart(textBodyPart);
		        
		      	//set the calendar as a string inside body of email
		      	MimeBodyPart messageBodyPart = new MimeBodyPart();
                        CalendarOutputter co = new CalendarOutputter(false);
		        Writer wtr =  new StringWriter();
		      	co.output(cal, wtr);
		      	String content = wtr.toString();
		      	messageBodyPart.setContent(content, "text/calendar;method=REQUEST;charset=\"UTF-8\"");
		      	multipart.addBodyPart(messageBodyPart);

			msg.setContent(multipart);

		        tr.connect();
		        tr.sendMessage(msg, msg.getRecipients(javax.mail.Message.RecipientType.TO));
		} catch (Exception e) {
			e.printStackTrace();
                }