Error in sending mail 2nd time, Where is the fault- Help Please

Question

Hi friends,
I had written a program to send mail. Everything is fine, when i send first time. But if I try to send mail 2nd time, It gives the error:
Exception in Connect: IOException while sending message
Here is the complete code what i had written, It successfully connects using t.connect();
the problem in t.send();
output on JBoss Console is :
Inside Action
After Transport t = session.getTransport(protocol)
before t.connect()
after t.connect()
Exception in Connect IOException while sending message
import java.io.*;
import java.util.*;
import javax.activation.*;
import javax.mail.*;
import javax.mail.internet.*;
import javax.servlet.http.*;
import org.apache.struts.action.*;
public class MsgSend extends Action {
     @Override
     public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request
               , HttpServletResponse response) throws Exception {
          response.setContentType("text/xml");
          PrintWriter out = response.getWriter();
          System.out.println("Inside Action");
            String to = request.getParameter("to");
         String bcc = request.getParameter("bcc");
         String cc = request.getParameter("cc");
         String subject = request.getParameter("sub");
         String user = request.getParameter("user");
         //String password = request.getParameter("pass");
         String message = request.getParameter("message");
         String from = user + "@domainname.com" ;
         /*Properties props = System.getProperties();
         props.put("mail.smtp.host", "smtp.vsginc.com");
          MailBean  bean = MailBean.getInstance();          
          Session session = bean.getSession();          
          String protocol = "smtp";
          Transport t = session.getTransport(protocol);
          System.out.println("After Transport t =              session.getTransport(protocol)");
         MimeMessage msg = new MimeMessage(session);
         msg.setFrom(new InternetAddress(from));
         InternetAddress[] address = {new InternetAddress(to)};
         msg.setRecipients(Message.RecipientType.TO, address);
         if(cc != null ){
               InternetAddress ccAddr[]  = InternetAddress.parse(cc);
               msg.setRecipients(Message.RecipientType.CC, ccAddr);
          if(bcc != null){
               InternetAddress bccAddr[] = InternetAddress.parse(bcc);
               msg.setRecipients(Message.RecipientType.BCC,bccAddr);
         msg.setSubject(subject);
         // create and fill the first message part
         MimeBodyPart messageBodyPart = new MimeBodyPart();
         messageBodyPart.setText(message);
         Multipart multipart = new MimeMultipart();
         multipart.addBodyPart(messageBodyPart);
         Attachment attachment = Attachment.getInstance();
         ArrayList<String> fileList = attachment.getFileNames();
         String parentFolder = null;
         for(String path:fileList){
              File attachmentFile = new File(path);
              messageBodyPart = new MimeBodyPart();
              DataSource source = new FileDataSource(attachmentFile);
              messageBodyPart.setDataHandler(new DataHandler(source));
              messageBodyPart.setFileName(attachmentFile.getName());
              multipart.addBodyPart(messageBodyPart);
              parentFolder = attachmentFile.getParent();
         // add the Multipart to the message
         msg.setContent(multipart);
         // set the Date: header
         msg.setSentDate(new Date());        
         try {
              System.out.println("before t.connect()");
               t.connect(bean.getSmtpServer(),bean.getUsername() ,bean.getPassword());
               System.out.println("after t.connect()");
               //Error is coming here in this Line.
               t.sendMessage(msg, msg.getAllRecipients());
               * System.gc(); will relese the fileHandles, if some resource
               * still holds it.               
               System.out.println("before System.gc()");
               System.gc();
               * Deleting All the Files from Attachment Folders.
              System.out.println("before attachmentFolder");
              File attachmentFolder = new File(parentFolder);
              System.out.println("Attachment Folder Name is : "+attachmentFolder.getAbsolutePath());
              if(attachmentFolder.isDirectory()){
                   File[] files = attachmentFolder.listFiles();
                   System.out.println("No of Files For Attachments are: "+files.length);
                   boolean deleteResult = false;
                   for(int i=0; i<files.length; i++ ){
                        deleteResult = files.delete();
                    System.out.println(files[i].getName() + " Delete Staus is :"+ deleteResult);
          System.out.println("All attachments Deleted");
          out.print("<result>Mail has been sent successfully</result>");
          } catch (Exception e) {
               out.print("<result>Mail sending failed</result>");
               System.out.println("Exception in Connect "+e.getMessage());
          }finally{
               t.close();               
          return null;
Problem only comes, when i send 2nd time or more. What is the problem? Please help me out.
Thanks for your response in advance. One more thing, Whether to send a mail & receive a mail, we need to create different sessions. one for sending & one for receiving mails.
Message was edited by:
Ashish.Mishra16

Answer 1

I don't see anything obviously wrong in your code. Try adding
session.setDebug(true);
You can use the same Session for sending and for reading.
A Session just encapsulates your configuration parameters,
so as long as they're the same for both usages, one Session
is fine.