Yes, I understood that I need to post a piece of code.
All the code is straightforward and all in doGet() - without nothing from
JavaMail being even mentioned in the init():
public void doGet (...)
[...]
Properties props = System.getProperties ();
props.put ("mail.smtp.host", mySmtpServer);
Session session = Session.getInstance (props, null);
MimeMessage message = new MimeMessage (session);
[... fill the message data ...]
Transport.send (message);
I feel there exists some _implicit_ networking initialization that happens
when servlet is started. And its results may probably need being
overridden... But I cannot figure out what it can be...
Regards,
Sergey
----- Original Message -----
From: "Nitin Borwankar" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Saturday, June 02, 2001 3:43 AM
Subject: Re: Reinitializing JavaMail networking environment
> Sergey,
>
> I think the following will work, not 100% sure, am just getting back to
> using JavaMail after a
> 3 year absence (I used the v1.0 in 1998 and haven't since)
>
> Not clear where in your Servlet lifecycle you are creating the
> javax.mail.Session.
> If in the servlet init(), then you may have to get it out of there.
>
> You are probably doing
>
> javax.mail.Session mailsession =
> javax.mail.Session.getDefaultInstance(properties, null)
>
> somewhere.
>
> This initializes the mail session and everything else follows from here.
> If the mail session is null, everything else (Message creation,
> Transport.send(msg) ..) will fail.
>
> You need to re instantiate the javax.mail.Session, AFTER you are sure
> you have
> a valid connection to your ISP. So repeat the steps starting with
>
> javax.mail.Session mailsession = Session.getDefaultInstance(...) all the
> way to Transport.send()
>
> This should solve the problem.
>
> If this is happening inside servlet init, you may need to get the code
> out of there and
> invoke it through some other mechanism as servlet init is invoked ONCE
> at servlet lifecycle begin by the
> servlet container. Then the servlet will probablly stay in memory and
> init() will not be invoked every future servlet invocation.
>
> Alternatively, you may want to throw a ServletException inside init() if
> your mail session is not initialized, then the servlet will not
> be instantiated and the next time it is invoked ( hopefully there is a
> connection to your ISP by this time) the servlet will instantiate the
> mail session successfully and will itself be instantiated successfully
> and all will be well.
> If this is not clear send me the code and I may be able to help further.
>
>
> Nitin Borwankar.
>
>
> "Ushakov, Sergey N" wrote:
> >
> > Hi,
> >
> > sorry for probable (but I hope not 100% :) offtopic, but it is my last
> > resort as I could not get response at jGuru and Sun forums. And I did
not
> > dare to ask at James developer's forum...
> >
> > It's a programmer's question: how can one re-initialize JavaMail
networking
> > enviromnent just before sending mail?
> >
> > I use JavaMail in a servlet with Tomcat, and everything works perfectly
if
> > my ISP connection was up when the servlet was launched. Otherwize
> > Transport.send() fails with "javax.mail.MessagingException: Unknown SMTP
> > host" at javax.mail.Transport.send0(Transport.java:219) - even when ISP
> > connection is available. How can I make JavaMail "forgive the offense"
that
> > originates from its startup?
> >
> > Regards,
> > Sergey Ushakov
> >
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