JavaMail send 9M pdf attach through Gmail

Question

Hello Everyone,
I have this issue while trying to send email with attach (an pdf of 9M) . In the beginning I can see in the console that packets are sent really fast. Everything seem OK, but in time the speed decrease, Thus in about 10 minutes or more it barely sends anything. No errors whatsoever.
If I am sending smaller attachments (under 900K) they work fine, i receive them, open them...all is great.
I performed this test, sending the same content with the same attach directly from gmail web mail and it was uploaded in about 10 minutes- which i find it acceptable. Why does JavaMail take so long?
My application is a standalone app , a swing app. I tried sending the mail both from GUI's main thread and from a distinct thread. No big difference.
Anyone any idea? Someone hit this issue before?
Here is some code:
Properties props = new Properties();
          props.put("mail.smtp.user", userName);
props.put("mail.smtp.host", host);
if(!"".equals(port))
props.put("mail.smtp.port", port);
//if(!"".equals(starttls))
//props.put("mail.smtp.starttls.enable",starttls);
props.put("mail.smtp.auth", auth);
if(debug)
props.put("mail.smtp.debug", "true");
else
props.put("mail.smtp.debug", "false");          
          if(!"".equals(port))
props.put("mail.smtp.socketFactory.port", port);
          if(!"".equals(socketFactoryClass))
props.put("mail.smtp.socketFactory.class",socketFactoryClass);
          //if(!"".equals(fallback))
//props.put("mail.smtp.socketFactory.fallback", fallback);
try
Session session = Session.getDefaultInstance(props, null);
session.setDebug(debug);
MimeMessage msg = new MimeMessage(session);
//msg.setText(text);
msg.setSubject(subject);
msg.setFrom(new InternetAddress("[email protected]"));
for(int i=0;i<to.length;i++)
msg.addRecipient(Message.RecipientType.TO, new InternetAddress(to));
for(int i=0;i<cc.length;i++)
msg.addRecipient(Message.RecipientType.CC, new InternetAddress(cc[i]));
for(int i=0;i<bcc.length;i++)
msg.addRecipient(Message.RecipientType.BCC, new InternetAddress(bcc[i]));
// create the message part
MimeBodyPart messageBodyPart = new MimeBodyPart();
messageBodyPart.setText(text);
Multipart multipart = new MimeMultipart();
multipart.addBodyPart(messageBodyPart);
messageBodyPart = new MimeBodyPart();
DataSource source = new FileDataSource("f:/__BOOKS__/1000_Java_Tips_low.pdf");
messageBodyPart.setDataHandler(new DataHandler(source));
messageBodyPart.setFileName("1000_Java_Tips_low.pdf");
messageBodyPart.setFileName(source.getName());
//messageBodyPart.attachFile("f:/__BOOKS__/J2EE JSF Tutorial.pdf");
multipart.addBodyPart(messageBodyPart);
msg.setContent(multipart);
msg.saveChanges();
Transport transport = session.getTransport("smtp");
transport.connect(host, userName, passWord);
transport.sendMessage(msg, msg.getAllRecipients());
transport.close();
return true;
Thanks and best regards,
Ionut.

Answer 1

Off course, i let the application run just to see it manage to send the mail. But after about an hour or more i get this error:
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java.net.SocketException: Connection reset by peer: socket write error
at java.net.SocketOutputStream.socketWrite0(Native Method)
at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:92)
at java.net.SocketOutputStream.write(SocketOutputStream.java:136)
at com.sun.net.ssl.internal.ssl.OutputRecord.writeBuffer(OutputRecord.java:295)
at com.sun.net.ssl.internal.ssl.OutputRecord.write(OutputRecord.java:284)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.writeRecordInternal(SSLSocketImpl.java:727)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.writeRecord(SSLSocketImpl.java:715)
at com.sun.net.ssl.internal.ssl.AppOutputStream.write(AppOutputStream.java:59)
at com.sun.mail.util.TraceOutputStream.write(TraceOutputStream.java:114)
at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:65)
at java.io.BufferedOutputStream.write(BufferedOutputStream.java:109)
at com.sun.mail.util.CRLFOutputStream.write(CRLFOutputStream.java:84)
at com.sun.mail.smtp.SMTPOutputStream.write(SMTPOutputStream.java:87)
at com.sun.mail.util.CRLFOutputStream.write(CRLFOutputStream.java:75)
at com.sun.mail.util.BASE64EncoderStream.write(BASE64EncoderStream.java:140)
at javax.activation.DataHandler.writeTo(DataHandler.java:322)
at javax.mail.internet.MimeBodyPart.writeTo(MimeBodyPart.java:1403)
at javax.mail.internet.MimeBodyPart.writeTo(MimeBodyPart.java:874)
at javax.mail.internet.MimeMultipart.writeTo(MimeMultipart.java:444)
at com.sun.mail.handlers.multipart_mixed.writeTo(multipart_mixed.java:102)
at javax.activation.ObjectDataContentHandler.writeTo(DataHandler.java:897)
at javax.activation.DataHandler.writeTo(DataHandler.java:330)
at javax.mail.internet.MimeBodyPart.writeTo(MimeBodyPart.java:1403)
at javax.mail.internet.MimeMessage.writeTo(MimeMessage.java:1745)
at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:636)
at ro.crm.johnny.mail.Mailer.sendMail(Mailer.java:160)
at ro.crm.johnny.mail.Mailer.sendit(Mailer.java:45)
at ro.crm.johnny.MainFrame.cmdSendEmailActionPerformed(MainFrame.java:1306)
at ro.crm.johnny.MainFrame.access$2100(MainFrame.java:65)
at ro.crm.johnny.MainFrame$22.actionPerformed(MainFrame.java:811)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1849)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2169)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:420)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:258)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)
at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:231)
at java.awt.Component.processMouseEvent(Component.java:5517)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3135)
at java.awt.Component.processEvent(Component.java:5282)
at java.awt.Container.processEvent(Container.java:1966)
at java.awt.Component.dispatchEventImpl(Component.java:3984)
at java.awt.Container.dispatchEventImpl(Container.java:2024)
at java.awt.Component.dispatchEvent(Component.java:3819)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4212)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3892)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3822)
at java.awt.Container.dispatchEventImpl(Container.java:2010)
at java.awt.Window.dispatchEventImpl(Window.java:1791)
at java.awt.Component.dispatchEvent(Component.java:3819)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:463)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)
javax.mail.MessagingException: IOException while sending message;
nested exception is:
java.net.SocketException: Connection reset by peer: socket write error
at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:676)
at ro.crm.johnny.mail.Mailer.sendMail(Mailer.java:160)
Anyone, Any idea yet?