Re: java mail and thread

Knute Johnson <>
Thu, 24 Oct 2013 15:07:45 -0700
On 10/24/2013 14:28, wrote:

Good evening to all .
I'm designing an application that has the task of sending the email automatically taking the recipients from a db.
To send email I created a special class that receives the string with the recipient's address and sends mail.
The instruction to send the message:

Transport.send (msg ) ;

I noticed that this statement takes a bit of seconds before releasing
flow and therefore are unable to use the other functions of the application . I thought , therefore, to use a technology where each object of the class that sends the email implements Runnable and then i use it like a thread.
I noticed , however, that there are problems because sometimes 20 over 50 emails fail and the instruction that give me the error is

Transport.send (msg ) ; : Connection closed by remote host

and seems to be the fact that the thread dies too fast after the statement
Transport.send (msg ) ;
So I inserted a Thread.sleep ( 10000 ) ;
but sometimes I goes equally mistaken, then I tried to employ
t.join ();
but it blocks the flow (basically waiting for the thread to end it all before giving way to another )
What can I do ?
If you need I can write a few lines of code to make you understand how I'm implementing the functionality described

I look forward ideas


I think your plan to use a separate thread to spool the messages out
makes perfect sense.

I'm curious what is causing the SocketException. I looked at some of my
code and I don't catch SocketExceptions when sending mail.

 From the docs on Transport "Note that send is a static method that
creates and manages its own connection. Any connection associated with
any Transport instance used to invoke this method is ignored and not
used. This method should only be invoked using the form
Transport.send(msg);, and should never be invoked using an instance


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