Question

I want to trigger my email via servlets, but it is not triggering. When I run code as a standalone Java application, it is working fine. Below is my code.
Servlet is giving me problem, from server I am not able to trigger the code

package model;

import java.util.Date;
import java.util.Properties;

import javax.mail.*;
import javax.mail.internet.AddressException;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import javax.naming.InitialContext;
importjavax.naming.NamingException;

import com.sun.xml.internal.bind.CycleRecoverable.Context;

public class TestJavaMail   
{

    String userid ;
    String password;
    public TestJavaMail(String userid , String password)
    {
        this.userid = userid;
        this.password =password;
    }

        public void process()
        {

        String[] to = {"[e-mail]","manish.kaushik@agnitio-           technologies.com",
                "[e-mail]"};
        Properties props = new Properties();   
        props.put("mail.transport.protocol", "smtp");   
        props.put("mail.smtp.host", "smtp.exchangemails.com");   
        props.put("mail.smtp.port", 25);   

        props.put("mail.smtp.user", userid);   
        props.put("mail.smtp.pass", password);   
        props.put("mail.smtp.starttls.enable", "true");   
        props.put("mail.smtp.auth ", "true");   

                                Authenticator auth = new javax.mail.Authenticator()   
        {   
             protected PasswordAuthentication getPasswordAuthentication()   
            {   
                return new PasswordAuthentication(userid, password);   
            }   
        };   

                    Session session = Session.getDefaultInstance(props,auth);   

        try  
        {   
                                MimeMessage msg = new MimeMessage(session);   
            System.out.println("Mimemessage ceated");   
            InternetAddress[] iaFrom = { new InternetAddress(   
                    "[e-mail]") };   
            msg.setFrom(iaFrom[0]);   
            InternetAddress[] iaTo =  new InternetAddress[to.length] ;  
            for(int i=0;i<to.length;i++)
            {
                iaTo[i] = new InternetAddress(to[i]);
                msg.addRecipient(Message.RecipientType.TO, iaTo[i]);
            }

            msg.setSubject("Test Java Mail");   
            msg.setSentDate(new Date());   
            msg.setText("Hello, Congrats - It is working\n pls send acknowledgement mail to senderof u get this" +
                    "\n as it is part of project");   
            Transport tran = session.getTransport("smtp");   
            System.out.println("Transport object created......");   
            //tran.setStarttls(true);   
            tran.connect("smtp.exchangemails.com", 25, "moonis.raza@agnitio-           technologies.com", "welcome");   
            //tran.connect();   
            msg.saveChanges();   
            System.out.println("Connect succeeded");   
            tran.sendMessage(msg, msg.getAllRecipients());   
            tran.close();   
            System.out.println("Mail Sent Successfully");   
        }   
        catch (MessagingException mex)   
        {   
            System.out.println("send failed, exception: " + mex);   
        }   
                        }   
}  

Here is servlet code:

package com.controller;

import java.io.*;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import model.TestJavaMail;
/**
 * Servlet implementation class emailservice
 */
   public class emailservice extends HttpServlet {


    protected void doGet(HttpServletRequest req, HttpServletResponse res) throws     ServletException, IOException {
        res.setContentType("text/html");
        System.out.println("here");

            PrintWriter writer = res.getWriter();
            writer.println("HELLO WORLD");
            String h = "hello";

            writer.println("" +h);

            writer.println("welcome ");

            writer.println(req.getRemoteHost());




        String userid = getServletConfig().getInitParameter("userid");
        String password = getServletConfig().getInitParameter("password");
        writer.println(userid);     
        TestJavaMail t1 = new TestJavaMail(userid, password);

        t1.process();
        writer.println("\n bhej di ");


    }


    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    }

}

Answer 1

I tried to run you code for myself to see what would happen. First, I made sure I had mail.jar file available on the classpath. Second, I did a bit of necessary changes in order to be able to run the code without getting authentication errors. i.e, instead of:

props.put("mail.smtp.host", "smtp.exchangemails.com"); 

I used:

props.put("mail.smtp.host", "smtp.gmail.com");

and obviously, I had to provide my own username and password for this different host.

You are right; The application worked well when was executed standalone. However, when I moved it to a JBoss AS 7.0.0, I encountered two different problems.

Initially, I faced this error:

at javax.mail.Session.getDefaultInstance(Session.java:320) [mail-1.4.4.jar:1.4.4]
at test.TestJavaMail.process(TestJavaMail.java:42) [classes:]

which after some googling and finding the solution given here, I could get rid of this error. i.e, I replaced this line:

Session session = Session.getDefaultInstance(props, auth);

with:

Session session = Session.getInstance(props, auth);

Then, I tried running the application again. This time, I received the below error:

java.lang.NoClassDefFoundError: javax/net/ssl/SSLPeerUnverifiedException
    com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1900)
    com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:638)
    javax.mail.Service.connect(Service.java:295)
    test.TestJavaMail.process(TestJavaMail.java:63)

I Googled the above error and found there was a bug with my used JBoss version. So, I moved the application to a later JBoss version which was JBoss AS 7.1.1 and I succeeded. The servlet successfully sent an email to the destination I had provided for it.

I hope this investigation will be helpful to you and to any visitor who is struggling with a similar problem.