Attachment erron when send an e-mail

Question

We've implemented a page in a portal to allow users send e-mails to support center. We've developed a java component for this purpose. The page, contained in an iView, supplies typical things of an e-mail, attachments box too.
The problem is the attachment. When users send an e-mail without attachment, e-mail is received fine.
But when users send an e-mail with attachment, e-mail is received but empty (without attachment and without descriptions).
I've reviewed the Java Component for sending e-mails, but I can not find the error. Could somebody review this java code to look for the error or give me some idea about this error, please? 
Thank you very much
<b><u>CODE:</u></b>
package ContactUsComponent.utils;
import com.sapportals.portal.prt.component.*;
import com.sapportals.portal.prt.logger.ILogger;
import com.sapportals.portal.prt.runtime.PortalRuntime;
import com.sapportals.htmlb.FileUpload;
import javax.activation.DataHandler;
import javax.activation.DataSource;
import javax.mail.*;
import javax.mail.internet.*;
import java.io.BufferedInputStream;
import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.util.*;
public class MailUtils implements IComponentConstants {
     private static ILogger logger = PortalRuntime.getLogger();
     public static void sendMail (IPortalComponentRequest request, String firstName,
                     String lastName, String email,     String subject, String phone, String text, FileUpload file) throws Exception {
          try {          
               //logger.severe("1");
               Properties props = System.getProperties();
               //logger.severe("2");
               props.put("mail.smtp.host", getPropertyPortalApp(request.getComponentContext(),SMTP_SERVER));
               //logger.severe("3");               
               Session session = Session.getDefaultInstance(props, null);
               //logger.severe("4");
               // -- Create a new message --
               Message msg = new MimeMessage(session);
               //logger.severe("5");
               // -- Set the FROM and TO fields --
               msg.setFrom(new InternetAddress(email));
               msg.setRecipients(Message.RecipientType.TO, InternetAddress.parse(getPropertyPortalApp(request.getComponentContext(),EMAIL_TO), false));
               //logger.severe("6");
               // -- Set the subject and body text --
               msg.setSubject(getPropertyString(request,"SUBJECT") + subject);
               //logger.severe("7");
               // -- Set some other header information --
               //msg.setHeader("X-Mailer", getPropertyString(request,"X_MAILER"));
               msg.setSentDate(new Date());          
               // Create the message part
                BodyPart messageBodyPart = new MimeBodyPart();
               //logger.severe("8");
               // Fill the message          
               messageBodyPart.setText(createEmailText(request,firstName,lastName,email,subject,phone,text));
               //logger.severe("9");
               Multipart multipart = new MimeMultipart();
               multipart.addBodyPart(messageBodyPart);
               //logger.severe("10");
               // Part two is the attachment
               if ((file != null) && (file.getFile() != null)) {
                    //logger.severe("11");
                    // get the file
                    String mimetype = file.getFile().getContentType();
                    String fileName = file.getFile().getFileName();
                    // If the fileName is empty, don't attach
                    if ((fileName == null) && (fileName.equals(IComponentConstants.EMPTY_STRING))) {
                         FileInputStream fis = null;
                         try {
                              fis = new FileInputStream(file.getFile().getFile().getAbsolutePath());
                         } catch (FileNotFoundException ex) {
                              // TODO: Deal with exception. Show error message to user
                              throw ex;
                         BufferedInputStream bis = new BufferedInputStream(fis);
                         ByteArrayOutputStream baos = new ByteArrayOutputStream();
                         int ch;
                         while ((ch = bis.read()) != -1) {
                           baos.write(ch);
                         //byte[] buffer = baos.toByteArray();
                         DataSource source = new FormDataSource(baos,mimetype);
                         messageBodyPart.setDataHandler(new DataHandler(source));
                         messageBodyPart.setFileName(fileName);                    
                         multipart.addBodyPart(messageBodyPart);
               //logger.severe("20");
               // Put parts in message
               msg.setContent(multipart);
               //logger.severe("21");
               // -- Send the message --
               Transport.send(msg);
          } catch (Exception ex) {
               logger.severe("Exception sending e-mail: " + ex);
               throw ex;
     private static String createEmailText (IPortalComponentRequest request, String firstName, String lastName,
                               String email, String subject, String phone, String text) {
          String emailText = "";
          emailText += "[Abstract] " + subject;
          emailText += "\n[Product] " + getPropertyString(request,"PRODUCT");
          emailText += "\n[Last Name] " + lastName;
          emailText += "\n[First Name] " + firstName;
          emailText += "\n[Work Phone] " + phone;
          emailText += "\n[Account] " + getPropertyString(request,"ACCOUNT");
          emailText += "\n[Long Description] " + text;
          emailText += "\n[Email] " + email;
          emailText += "\n[Status] " + getPropertyString(request,"STATUS");
          emailText += "\n[Priority] " + getPropertyString(request,"PRIORITY");
          emailText += "\n[Source] " + getPropertyString(request,"SOURCE");
          return (emailText);
     public static String getPropertyString (IPortalComponentRequest request, String resource_key) {
          try     {
               ResourceBundle bundle = request.getResourceBundle();
               if (bundle != null) {
                    return (bundle.getString(resource_key));
               return (null);
           } catch (MissingResourceException e) {
               return (e.getMessage());
     /** returns a property from portallapp.xml/iView-Config
@param context
@return
    private static String getPropertyPortalApp (IPortalComponentContext context, String property) {
       return context.getProfile().getProperty(property);

Answer 1

Hi, Dipankar:
Thanks for your reply. But I have no idea about how to group parameter from all uploaded file to "Send an E-Mail in Background with Attachment" CO?
For the situation, I write a background CO program to get all uploaded file (from first three block) and grouping this customized CO parameter with "Send an E-Mail in Background with Attachment" CO.