connection failure exception

[gayathri murugesan]

i have an application where unread messages must be retrieved from the gmail server inbox whenever it arrives.

while(true)
{
try {
           Folder folder = store.getFolder("INBOX");
            //System.out.println("AFTER FOLDER");
            folder.open(Folder.READ_ONLY);
            
            FlagTerm ft = new FlagTerm(new Flags(Flags.Flag.SEEN), false);

            Message message[] = folder.search(ft);

            //Retrieve message headers for each message in folder.
            FetchProfile profile = new FetchProfile();
            profile.add(FetchProfile.Item.ENVELOPE);
            folder.fetch(message, profile);
             System.out.println("the count of unread ones:"+folder.getUnreadMessageCount());
            if(folder.getUnreadMessageCount()>0)
            {
            
            
             for (int i=0, n=message.length; i<n; i++) {

            msg=message[i].getSubject();
            Object content = message[i].getContent();
            Address[] senders = message[i].getFrom();
            System.out.println("FROM:"+senders[0].toString());
      System.out.println("DATE:"+message[i].getSentDate());
      final2=senders[0].toString()+"\t"+message[i].getSubject()+"\t"+message[i].getSentDate()+"\t";
        if (content instanceof Multipart) {
            StringBuffer messageContent = new StringBuffer();
            Multipart multipart = (Multipart) content;
            for (int j= 0; j < multipart.getCount(); j++) {
               
                Part part = (Part) multipart.getBodyPart(j);
                if (part.isMimeType("text/plain")) {
                  
                     messageContent.append(part.getContent().toString());
                }
            }
            System.out.println("$$$$$$$$$$$$$$$"+messageContent.toString()+"$$$$$$$$$$$$$$$");
            final1=msg+" "+messageContent.toString();
              final2=final2+messageContent.toString();
            
        } else {
              System.out.println("***********"+content.toString()+"*****************");
               final1=msg+" "+content.toString();
               final2=final2+content.toString();
          
            
            
        }
        //finalMessage.add(final1);
        Classifier c=new Classifier();
        c.separator(final1,final2);

        final1="";
        
      // System.out.println(message[i].getContent().toString());
       //if (content.length() > 200) {
         //content = content.substring(0, 200);
       }
       //System.out.println(content);
       }
           
             Thread.sleep(10000);
            
             
            } catch (Exception e) {
            // Close the downloading dialog.
            
             e.printStackTrace();
            // Show error dialog.
            showError("Unable to download messages.", true);
           
        }
}       
}

the loop is executing for 15 times and the unread messages are retrieved but after 15 times i am getting exception


javax.mail.MessagingException: connection failure
at com.sun.mail.imap.IMAPStore.getProtocol(IMAPStore.java:775)
at com.sun.mail.imap.IMAPFolder.open(IMAPFolder.java:910)
at EmailClient$Checker.run(EmailClient.java:721)
at java.lang.Thread.run(Unknown Source)


why is it so.is there any other way to do the same.