title: Why I am getting javax.mail.MessagingException ?
body: <p>I am trying to send mail from the Servlet. I had code like this and I am getting the Messaging Exception. There are many other similar questions in Stack Over Flow but none of them helped me. So I posted it again.</p>
  
  <pre><code>@WebServlet(name = "SendMail", urlPatterns = {"/SendMail"})
  public class SendMail extends HttpServlet {
  final String from = "teamwarrior20@gmail.com";
  final String username = "teamwarrior20@gmail.com";
  final String password = "iamfromnepal";
  String to;
  String subject;
  String dataMessage;
  
  @Override
  protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
      to = req.getParameter("to");
      subject = req.getParameter("subject");
      dataMessage = req.getParameter("message");
      sendMail();
      req.getRequestDispatcher("successfullmail.jsp").forward(req, resp);
  }
  
  private void sendMail() {
      System.out.println(to);
      System.out.println(subject);
      System.out.println(dataMessage);
      Properties props = System.getProperties();
  
      props.put("mail.smtp.auth", "true");
      props.put("mail.smtp.starttls.enable", "true");
      props.put("mail.smtp.host", "smtp.gmail.com");
      props.put("mail.smtp.port", "587");
  
      Session session = Session.getInstance(props, new javax.mail.Authenticator() {
          @Override
          protected PasswordAuthentication getPasswordAuthentication() {
              return new PasswordAuthentication(from, password); //To change body of generated methods, choose Tools | Templates.
          }
  
      });
      try {
          Message message = new MimeMessage(session);
  
          message.setFrom(new InternetAddress(from));
  
          message.setRecipient(Message.RecipientType.TO, new InternetAddress(to));
  
          message.setSubject(subject);
  
          message.setText(dataMessage);
  
          Transport.send(message);
  
      } catch (Exception e) {
          e.printStackTrace();
      }
  
  }
  
  }
  </code></pre>
  
  <p>My stack trace is like this....</p>
  
  <pre><code>Severe:   javax.mail.MessagingException: Could not connect to SMTP host: smtp.gmail.com, port: 465, response: -1
  at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:2042)
  at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:697)
  at javax.mail.Service.connect(Service.java:386)
  at javax.mail.Service.connect(Service.java:245)
  at javax.mail.Service.connect(Service.java:194)
  at javax.mail.Transport.send0(Transport.java:253)
  at javax.mail.Transport.send(Transport.java:124)
  at com.suraj.technepbankapplication.SendMail.sendMail(SendMail.java:74)
  at com.suraj.technepbankapplication.SendMail.doPost(SendMail.java:41)
  at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
  at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
  at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1682)
  at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:318)
  at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:160)
  at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:734)
  at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:673)
  at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:99)
  at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:174)
  at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:416)
  at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:283)
  at com.sun.enterprise.v3.services.impl.ContainerMapper$HttpHandlerCallable.call(ContainerMapper.java:459)
  at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:167)
  at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:206)
  at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:180)
  at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:235)
  at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119)
  at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:283)
  at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:200)
  at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:132)
  at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:111)
  at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77)
  at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:536)
  at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:112)
  at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:117)
  at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:56)
  at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:137)
  at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:591)
  at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:571)
  at java.lang.Thread.run(Thread.java:745)
  </code></pre>