Could not connect to SMTP host: localhost, port: 25

[Matthew Mchale <mm...@nuhorizons.com>]

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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RE: Could not connect to SMTP host: localhost, port: 25

["Caldarale, Charles R" <Ch...@unisys.com>]

> From: Matthew Mchale [mailto:mmchale@nuhorizons.com] 
> Subject: Could not connect to SMTP host: localhost, port: 25
> 
> It appears to be related to system resources in some way 

Are you running out of connections (sockets), or possibly file
descriptors?  Is everything that's being opened also being properly
closed?  The limits for a given process are platform dependent and
usually configurable.

 - Chuck


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