Problem while sending a java mail

**dushyant1244** · 09-17-2010, 06:29 AM

Hi

I am trying to send a mail using smtp server. The code is showing no error & it hangs after some time.

private void process(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
System.out.println("Test is successful");

String from = "No-reply@webmaster.com";

GetConnection connection = new GetConnection();
String to="";
try{
connection.getConnection();
JiraDAOImpl dao = new JiraDAOImpl();
to = dao.getEmail(request.getParameter("username"));
}catch(Exception e){
}

System.out.println("value of to >>>" + to);

String subject = "Time Spent Report Update";
String message = "Please find the Time Spent Report attachment with this mail";

Properties props = new Properties();
props.setProperty("mail.smtp.host", "sendmtw.mindtree.com");
props.setProperty("mail.smtp.port", "25");
props.setProperty("mail.smtp.auth", "false");
props.setProperty("mail.smtp.starttls.enable", "true");

Session session = Session.getDefaultInstance(props);
session.setDebug(true);

response.setContentType("text/html");
PrintWriter out = response.getWriter();

try {

MimeMessage msg = new MimeMessage(session);
System.out.println("got session");
msg.setSubject(subject);
msg.setFrom(new InternetAddress(from));
msg.addRecipient(Message.RecipientType.TO, new InternetAddress(to));
msg.setContent(message.toString(),"text/plain");
System.out.println("msg>>>>>>>"+ msg);
Transport.send(msg);

String title = "Send Email";
String res = "Sent message successfully";
String docType =
"<!doctype html public \"-//w3c//dtd html 4.0 " +
"transitional//en\">\n";
out.println(docType +
"<html>\n" +
"<head><title>" + title + "</title></head>\n" +
"<body bgcolor=\"#f0f0f0\">\n" +
"<h1 align=\"center\">" + title + "</h1>\n" +
"<p align=\"center\">" + res + "</p>\n" +
"</body></html>");

} catch (MessagingException ex2) {
ex2.printStackTrace();
}
}

it shows debug logs as

JDBCURL: jdbc:oracle:thin:@10.60.9.165:1522:keenan
Username :ref
strPassword:ref
Drivername :oracle.jdbc.driver.OracleDriver
JDBCURL: jdbc:oracle:thin:@10.60.9.165:1522:keenan
Username :ref
strPassword:ref
Drivername :oracle.jdbc.driver.OracleDriver
value of to >>>dushyant_lamyan@mindtree.com
DEBUG: setDebug: JavaMail version 1.4.3
got session
DEBUG: getProvider() returning javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Sun Microsystems, Inc]
DEBUG SMTP: useEhlo true, useAuth false
DEBUG SMTP: trying to connect to host "sendmtw.mindtree.com", port 25, isSSL false
220 ************************************************** ***********************************
DEBUG SMTP: connected to host "sendmtw.mindtree.com", port: 25

EHLO A4KEEMD08516.mindtree.com
250-mtw02mlr01.mindtree.com Hello [10.60.9.208], pleased to meet you
250-ENHANCEDSTATUSCODES
250-PIPELINING
250-8BITMIME
250-SIZE
250-DSN
250-ETRN
250-XXXXXXXXA
250 XXXB
DEBUG SMTP: Found extension "ENHANCEDSTATUSCODES", arg ""
DEBUG SMTP: Found extension "PIPELINING", arg ""
DEBUG SMTP: Found extension "8BITMIME", arg ""
DEBUG SMTP: Found extension "SIZE", arg ""
DEBUG SMTP: Found extension "DSN", arg ""
DEBUG SMTP: Found extension "ETRN", arg ""
DEBUG SMTP: Found extension "XXXXXXXXA", arg ""
DEBUG SMTP: Found extension "XXXB", arg ""
DEBUG SMTP: use8bit false
MAIL FROM:<No-reply@webmaster.com>
MAIL FROM:<No-reply@webmaster.com>
250 2.1.0 <No-reply@webmaster.com>... Sender ok
RCPT TO:<dushyant_lamyan@mindtree.com>
250 2.1.5 <dushyant_lamyan@mindtree.com>... Recipient ok
DEBUG SMTP: Verified Addresses
DEBUG SMTP: dushyant_lamyan@mindtree.com
DATA
354 Enter mail, end with "." on a line by itself
QUIT

Please help me in this issue.

**Tolls** · 09-17-2010, 08:56 AM

Java Code:

try{
    connection.getConnection();
    JiraDAOImpl dao = new JiraDAOImpl();
    to = dao.getEmail(request.getParameter("username"));
} catch(Exception e) {
}

That bit is nasty...eating an exception. What happens if the connection fails? Or the dao has problems? You'll never know.

Java Code:

System.out.println("got session");
msg.setSubject(subject);
msg.setFrom(new InternetAddress(from));
msg.addRecipient(Message.RecipientType.TO, new InternetAddress(to));
msg.setContent(message.toString(),"text/plain");
System.out.println("msg>>>>>>>"+ msg);

Going by your debug output the problem is in here, since the first sys out is printing, but the last one isn't. Nothing there that should pose a problem since all you seem to be doing is setting things, but I haven't done email stuff in years.

Are you sure you're not eating more exceptions somewhere?

**dushyant1244** · 09-17-2010, 09:41 AM

Hi

Thanks for reply.

Actually this is a POC only. And i am sure that i am not eating anymore exception.
I suspect some problem in session creation

Session session = Session.getDefaultInstance(props);

But i am not sure. I gone through some of the existing creations on net but none of answer is clear.

As it is not showing the message part in the debug as it used to be

for ex.
DEBUG SMTP SENT: DATA
DEBUG SMTP RCVD: 354 Enter mail, end with "." on a line by itself

DEBUG SMTP SENT:
.
DEBUG SMTP RCVD: 250 2.0.0 k4UA9Wh1001734 Message accepted for delivery

DEBUG SMTP SENT: QUIT

if you see message delivery is present in logs but this thing is absent in my logs

One more concern is that it is sending mail sucessfully 1 out of 25 times i am trying.

Please take a look & suggest me something

Thanks & Regards
Dushyant

**Tolls** · 09-17-2010, 09:46 AM

Have you stepped through it in a debugger to see exactly where it hangs?

**dushyant1244** · 09-17-2010, 09:59 AM

Hi

Thanks for reply

Yes i checked. It is hanging at

Session session = Session.getDefaultInstance(props);

after this is going to Daemon threads and showing the error in the page :::

--------------------------------------------------------------------
java.lang.ClassNotFoundException: javax.mail.StreamLoader
org.apache.catalina.loader.WebappClassLoader.loadC lass(WebappClassLoader.java:1645)
org.apache.catalina.loader.WebappClassLoader.loadC lass(WebappClassLoader.java:1491)
java.lang.ClassLoader.loadClassInternal(Unknown Source)
com.keenan.jira.emailReport.EmailServlet.process(E mailServlet.java:56)
com.keenan.jira.emailReport.EmailServlet.doPost(Em ailServlet.java:93)
javax.servlet.http.HttpServlet.service(HttpServlet .java:637)
javax.servlet.http.HttpServlet.service(HttpServlet .java:717)
----------------------------------------------------------

If you see the logs it is showing error at EmailServlet.java:56 which is

Session session = Session.getDefaultInstance(props); line:56
Thanks & Regards
Dushyant

**Tolls** · 09-17-2010, 10:12 AM

Have you got the correct jar file?
Unless the class loader's playing silly buggers, that implies you are missing the JavaMail jar file.

**dushyant1244** · 09-17-2010, 10:19 AM

Hi

Thanks for the reply

i am using mail-1.4.3.jar and activation.jar currently. Are these compatible

Apart of this i am using
eclipse 3.5.0 (eclipse galileo) with tomcat apache-tomcat-6.0.29

Please let me know if jar used are correct or not.

Thanks & Reagrds
Dushyant

**Tolls** · 09-17-2010, 10:30 AM

No idea, but that error message is implying that Tomcat can't see the jar file.

**dushyant1244** · 09-17-2010, 10:42 AM

Hi

Thanks fro reply

But if i remove the jar from the lib folder it shows so many compilation error but if i adds the jar, all will go. it means it is picking up the jar.

There may be the chance that i am not using the correct jar or incompatible jar. So i ll try the other versions of the jar (mail.jar) & let see if it works. If you will get anything else on this. Please reply

Thanks & Regards
Dushyant lamyan

**Tolls** · 09-17-2010, 10:51 AM

That's compilation.
The exception above is during runtime.
At runtime Tomcat can't find that class, so presumably can't see that jar.
Are you sure it's being deployed?

I can't remember how the internal tomcat works for Eclipse, I always dropped the war onto my own Tomcat and attached the debugger to it.

**dushyant1244** · 09-17-2010, 11:31 AM

Hi

Thanks for the reply.

I am not using war deployment here. I am using the as a project tree structure. I added these two jars in the WebContent -> WEB-INF -> lib

Thanks & Regards
Dushyant Lamyan

**Tolls** · 09-17-2010, 11:39 AM

This is why I do war deployment, so I don't have to wonder whether it's some odd setup in my IDE that's wrong...I can just look at the unzipped war and see if the correct libraries are in there or not.

**dushyant1244** · 09-17-2010, 01:35 PM

Hi

Thanks for the reply

I tried this option too. Same results.

Thanks & Regards
Dushyant Lamyan

**Tolls** · 09-17-2010, 02:05 PM

That error means it cannot see the jar/find the class.

Since I can't see your system, that is all I can tell you...so you'll have to hunt around in your setup to see if it's successfully deployed, referenced, whatever.

**JosAH** · 09-17-2010, 02:20 PM

Originally Posted by dushyant1244

i am using mail-1.4.3.jar and activation.jar currently. Are these compatible

If you're using Java 1.6 you don't need JAF at all (it is included with the Java core distribution). Otherwise you need version 1.1.1. See this link.

kind regards,

Jos

**impacted** · 03-15-2013, 10:37 PM

Originally Posted by dushyant1244

Hi

Thanks for reply

Yes i checked. It is hanging at

Session session = Session.getDefaultInstance(props);

after this is going to Daemon threads and showing the error in the page :::

--------------------------------------------------------------------
java.lang.ClassNotFoundException: javax.mail.StreamLoader
org.apache.catalina.loader.WebappClassLoader.loadC lass(WebappClassLoader.java:1645)
org.apache.catalina.loader.WebappClassLoader.loadC lass(WebappClassLoader.java:1491)
java.lang.ClassLoader.loadClassInternal(Unknown Source)
com.keenan.jira.emailReport.EmailServlet.process(E mailServlet.java:56)
com.keenan.jira.emailReport.EmailServlet.doPost(Em ailServlet.java:93)
javax.servlet.http.HttpServlet.service(HttpServlet .java:637)
javax.servlet.http.HttpServlet.service(HttpServlet .java:717)
----------------------------------------------------------

If you see the logs it is showing error at EmailServlet.java:56 which is

Session session = Session.getDefaultInstance(props); line:56
Thanks & Regards
Dushyant

I know this post is really old, BUT I came across in during my search for a solution to this exact same problem. I was trying to use JavaMail in my application, and it was a very strange problem, because I followed the exact instructions step by step to add the library to my IDE, Eclipse (instructions found here: JavaMail API - FAQ, JavaBeans also covered right above it). I could execute the application perfectly from within Eclipse, but as soon as I exported it into a .jar it would simply hang, giving no errors or any indications as to what was wrong. I commented out the code which used the JavaMail libraries and sure enough it no longer hung. So I knew it had something to do with how I installed them.

Well, after trying a lot of different things and doing a lot of searching, this guy's post actually helped guide me toward the answer. Our issues were identical. I finally looked at this part of the JavaMail FAQ, and it directed me the right way: JavaMail API - FAQ. This FAQ addresses the error he was getting. The pertinent part is: "add the Class-Path header to the manifest file of your jar file." So I went to the manifest guide (found here: http://docs.oracle.com/javase/tutori...r/downman.html), found instructions as to how to add this header, recompiled, and, as it states in the manifest article, you cannot reference an external .jar which has been sealed inside another .jar through the Class-Path header in the manifest. What that means is that after you have modified the manifest file to include mail.jar (the JavaMail library), you must make sure you have a copy of mail.jar in the working directory of the executing .jar which references it.

This solved my problem entirely. I personally don't wish to distribute the mail.jar along with my .jar. The above guide on manifests states that you CAN make your .jar reference another .jar file which has been sealed inside it through custom coding, so I am going to take the time to learn how to do this, thus eliminating the need to also provide mail.jar along with my executable.

Anyway, hope this ends up helping someone else along the way. Good luck.

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