A team, of which I am a member, is in the process of moving several
applications from Websphere App server to Tomcat. I've had an email function
in my application for a long while with no trouble. Now, I have an
intermittent problem occurring when I try to use JavaMail to send email. It
works sometimes and not others. The exception says something about
connecting to the localhost, but I set mail.smtp.host to a remote host.

It appears to be related to system resources in some way because the problem
tends to arise after the server has been running for a few hours. I
increased the heap size and the MaxPermSize, but there doesn't really seem
to be a shortage in memory according to Lambda Probe. It still happens on
and off. There are also a few other web apps running on this Tomcat instance
as well.

Any ideas on how to make this more stable would be appreciated. Are there
Tomcat specific things I need to do for JavaMail?

Thanks so much for any help,
Matt


Below are the stack trace and a snippet of the JavaMail code.

Properties props = System.getProperties();
props.put("mail.smtp.host", this.smtpServer);
Session session = Session.getDefaultInstance(props, null);
Message msg = new MimeMessage(session);
msg.setFrom(new InternetAddress(this.from));
msg.setRecipients(Message.RecipientType.TO, InternetAddress.parse(this.to));
msg.setSubject(this.subject);
msg.setText(this.body);
msg.setSentDate(new Date());
Transport.send(msg);


ERROR 2007-01-26 11:14:37,913 (ComplicatedEmail.java:send:125) -
javax.mail.MessagingException: Could not connect to SMTP host: localhost,
port: 25;
nested exception is:
java.net.ConnectException: Connection refused: connect
javax.mail.MessagingException: Could not connect to SMTP host: localhost,
port: 25;
nested exception is:
java.net.ConnectException: Connection refused: connect
at com.sun.mail.smtp.SMTPTransport.openServer (SMTPTransport.java:1282)
at com.sun.mail.smtp.SMTPTransport.protocolConnect (SMTPTransport.java:370)
at javax.mail.Service.connect (Service.java:275)
at javax.mail.Service.connect (Service.java:156)
at javax.mail.Service.connect (Service.java:105)
at javax.mail.Transport.send0 (Transport.java:168)
at javax.mail.Transport.send (Transport.java:98)
at
com.nuhorizons.rosettanet.www.ComplicatedEmail.send(ComplicatedEmail.java:11
2)
at
com.nuhorizons.rosettanet.util.AlertEmailUtil.sendEmail(AlertEmailUtil.java:
265)
at
com.nuhorizons.rosettanet.util.AlertEmailUtil.sendDesignEmail(AlertEmailUtil
.java:242)
at
com.nuhorizons.rosettanet.util.AlertEmailUtil.send5C2SentSuccessfully(AlertE
mailUtil.java:148)
at
com.nuhorizons.rosettanet.controller.transmit.remote.RemoteRequestRegistrati
onTransmitter.sendSuccessAlert(RemoteRequestRegistrationTransmitter.java:150
)
at
com.nuhorizons.rosettanet.controller.transmit.remote.RemoteMessageTransmitte
r.doPost(RemoteMessageTransmitter.java:107)
at javax.servlet.http.HttpServlet.service (HttpServlet.java:709)
at javax.servlet.http.HttpServlet.service (HttpServlet.java:802)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application
FilterChain.java:252)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh
ain.java:173)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.ja
va:213)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.ja
va:178)
at
org.apache.catalina.core.StandardHostValve.invoke (StandardHostValve.java:126
)
at
org.jstripe.tomcat.probe.Tomcat55AgentValve.invoke(Tomcat55AgentValve.java:2
0)
at
org.apache.catalina.valves.ErrorReportValve.invoke (ErrorReportValve.java:105
)
at org.apache.catalina.valves.AccessLogValve.invoke (AccessLogValve.java:541)

at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java
:107)
at
org.apache.catalina.connector.CoyoteAdapter.service (CoyoteAdapter.java:148)
at
org.apache.coyote.http11.Http11Processor.process (Http11Processor.java:869)
at
org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processC
onnection(Http11BaseProtocol.java:664)
at
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.jav
a:527)
at
org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWo
rkerThread.java:80)
at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.jav
a:684)
at java.lang.Thread.run (Thread.java:595)
Caused by: java.net.ConnectException: Connection refused: connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect (PlainSocketImpl.java:333)
at java.net.PlainSocketImpl.connectToAddress (PlainSocketImpl.java:195)
at java.net.PlainSocketImpl.connect (PlainSocketImpl.java:182)
at java.net.SocksSocketImpl.connect (SocksSocketImpl.java:366)
at java.net.Socket.connect (Socket.java:507)
at java.net.Socket.connect (Socket.java:457)
at com.sun.mail.util.SocketFetcher.createSocket (SocketFetcher.java:232)
at com.sun.mail.util.SocketFetcher.getSocket (SocketFetcher.java:189)
at com.sun.mail.smtp.SMTPTransport.openServer (SMTPTransport.java:1250)
... 30 more




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