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javax.mail.MessagingException: Could not convert socket to TLS exception in JAVA

I want to send a mail from my email address to another email address via clicking a button in JFrame netbeans.Here is the code,
import java.awt.HeadlessException;
import java.util.Properties;
import javax.activation.DataHandler;
import javax.activation.DataSource;
import javax.activation.FileDataSource;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Multipart;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;
import javax.swing.JOptionPane;
import com.sun.mail.util.MailSSLSocketFactory;
import java.io.File;
import javax.mail.PasswordAuthentication;
import javax.mail.*;
import javax.swing.JFileChooser;
private void btn_sendActionPerformed(java.awt.event.ActionEvent evt) {
final String From = txt_from.getText();
final String password = txt_password.getText();
String To = txt_to.getText();
String subject = txt_sub.getText();
String txtmessage = txt_body.getText();
Properties props = new Properties();
props.put("mail.smtp.host", "smtp.gmail.com");
props.put("mail.smtp.socketFactory.port", "587");
props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLsocketFactory");
props.put("mail.smtp.auth", "true");
props.put("mail.smtp.port", "587");
props.put("mail.smtp.starttls.enable", "true");
props.put("mail.smtp.ssl.trust", "smtp.gmail.com");
props.put("mail.smtp.socketFactory.fallback", "true");
props.put("mail.smtp.ssl.socketFactory", "true");
props.put("mail.smtp.EnableSSL.enable","true");
Session session = Session.getDefaultInstance(props,
new javax.mail.Authenticator() {
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication(From, password);
}
}
);
try {
Message message = new MimeMessage(session);
message.setFrom(new InternetAddress(From));
message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(To));
message.setSubject(subject);
MimeBodyPart messageBodyPart = new MimeBodyPart();
messageBodyPart.setText(txtmessage);
Multipart multiPart = new MimeMultipart();
multiPart.addBodyPart(messageBodyPart);
messageBodyPart = new MimeBodyPart();
DataSource source = new FileDataSource(attachment_path);
messageBodyPart.setDataHandler(new DataHandler(source));
messageBodyPart.setFileName(txt_DocAttach.getText());
multiPart.addBodyPart(messageBodyPart);
message.setContent(multiPart);
Transport.send(message);
JOptionPane.showMessageDialog(rootPane, "Message is sent");
} catch (MessagingException | HeadlessException e) {
JOptionPane.showMessageDialog(rootPane, e);
}
}
But it is giving me following error,
javax.mail.MessagingException: Could not convert socket to TLS; nested exception is: java.io.lOException: Exception in startTLS using SSL socket factory class null: host, port smtp.gmail.com, 587; Exception: java.lang.ClassNotFoundException: javax.netssl.SSLsocketFactory
Tried a lot but can't figure out what to do to solve it? Help please.

Try to change the value of the property mail.smtp.socketFactory.class
to javax.net.ssl.SSLSocketFactory instead of javax.net.ssl.SSLsocketFactory,
The class name is case sensitive.
For more infromations about connection properties you can look at:
Where to find all available Java mail properties?

As others have pointed out, your socket factory settings were wrong.
More importantly, you never needed to set them at all!

This error can also pop up if your JavaMail lib (mail.jar or javax.mail.jar) is too old.
Download the newest version from here: https://javaee.github.io/javamail/

Sending mail using java mail API but getting error. i can do successful. suggest bug fixing or provide correct code

Code:
import java.util.*;
import java.util.Date;
import java.util.Properties;
import javax.mail.Authenticator;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.AddressException;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
public class SendEmail
{
public static void main(String [] args)
{
String host="chnmail.hcl.com";
final String user="allwinjayson.m#hcl.com";
final String password="*********";
String to="allwinjayson.m#hcl.com";
//Get the session object
Properties props = new Properties();
props.put("mail.smtp.host",host);
props.put("mail.smtp.auth", "true");
props.put("mail.smtp.starttls.enable", "true");
props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
//new
Session session = Session.getDefaultInstance(props,
new javax.mail.Authenticator()
{
protected PasswordAuthentication getPasswordAuthentication()
{
return new PasswordAuthentication(user,password);
}
});
//Compose the message
try
{
MimeMessage message = new MimeMessage(session);
message.setFrom(new InternetAddress(user));
message.addRecipient(Message.RecipientType.TO,new InternetAddress(to));
message.setSubject("Testing");
message.setText("This is simple program of sending email using JavaMail API");
//send the message
Transport.send(message);
System.out.println("message sent successfully...");
}
catch (MessagingException e)
{
e.printStackTrace();
}
}
}
Error:
javax.mail.MessagingException: Could not connect to SMTP host: chnmail.hcl.com, port: 25;
nested exception is:
javax.net.ssl.SSLException: Unrecognized SSL message, plaintext connection?
at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1934)
at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:638)
at javax.mail.Service.connect(Service.java:313)
at javax.mail.Service.connect(Service.java:172)
at javax.mail.Service.connect(Service.java:121)
at javax.mail.Transport.send0(Transport.java:190)
at javax.mail.Transport.send(Transport.java:120)
at SendingClass.SendEmail.main(SendEmail.java:55)
Caused by: javax.net.ssl.SSLException: Unrecognized SSL message, plaintext connection?
at sun.security.ssl.InputRecord.handleUnknownRecord(InputRecord.java:694)
at sun.security.ssl.InputRecord.read(InputRecord.java:527)
at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:954)
at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1343)
at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1371)
at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1355)
at com.sun.mail.util.SocketFetcher.configureSSLSocket(SocketFetcher.java:503)
at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:234)
at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1900)
... 7 more

Don't specify the socket factory and it will work. SMTP over port 25 will initially be plaintext, and the starttls will then negotiate TLS for encryption.
Note that you will need JavaMail 1.4.5 or higher for this (current latest is 1.5.6).

I get java runtime exception when I am trying to send mail from outlook web access

I have read multiple blogs for this topic but am not able to debug the error.
I am trying to send mail from my corporate outlook web access. Here is the code :
package ReadOutlook;
import java.util.Properties;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
public class email_readClass {
public static void main(String[] args) {final String username = "user1";
final String password = "pass1";
Properties props = new Properties();
props.put("mail.transport.protocol", "smtp");
props.put("mail.smtp.auth", "true");
props.put("mail.smtp.starttls.enable", "true");
props.put("mail.smtp.host", "email.company.com");
props.put("mail.smtp.port", "443");
Session session = Session.getInstance(props,
new javax.mail.Authenticator() {
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication(username, password);
}
});
try {
Message message = new MimeMessage(session);
message.setFrom(new InternetAddress("user1#company.com"));
message.setRecipients(Message.RecipientType.TO,
InternetAddress.parse("user1#company.com"));
message.setSubject("Test");
message.setText("HI");
Transport.send(message);
System.out.println("Done");
} catch (MessagingException e) {
throw new RuntimeException(e);
}
}
}
This is the error I see :
Exception in thread "main" java.lang.RuntimeException: javax.mail.MessagingException: Exception reading response;
nested exception is:
java.net.SocketException: Connection reset
at ReadOutlook.email_readClass.main(email_readClass.java:45)
Caused by: javax.mail.MessagingException: Exception reading response;
nested exception is:
java.net.SocketException: Connection reset
at com.sun.mail.smtp.SMTPTransport.readServerResponse(SMTPTransport.java:1462)
at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1260)
at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:370)
at javax.mail.Service.connect(Service.java:297)
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 ReadOutlook.email_readClass.main(email_readClass.java:40)
Caused by: java.net.SocketException: Connection reset
at java.net.SocketInputStream.read(SocketInputStream.java:196)
at java.net.SocketInputStream.read(SocketInputStream.java:122)
at com.sun.mail.util.TraceInputStream.read(TraceInputStream.java:97)
at java.io.BufferedInputStream.fill(BufferedInputStream.java:235)
at java.io.BufferedInputStream.read(BufferedInputStream.java:254)
at com.sun.mail.util.LineInputStream.readLine(LineInputStream.java:75)
at com.sun.mail.smtp.SMTPTransport.readServerResponse(SMTPTransport.java:1440)
... 8 more
Any help would be appreciated.

The Exception means that the socket was closed unexpectedly. See this What's causing my java.net.SocketException: Connection reset?

Issue to send mail?

i created the application for mail sending in java Spring, the mail sending properly working in local server. after i export the (war file ) and host into tomcat server then execute the app but mail was not sending i don't know what is the problem of following code?
import java.util.Properties;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
public class SendMail {
public static void main(String[] args) {
Properties props = new Properties();
props.put("mail.smtp.host", "smtp.gmail.com");
props.put("mail.smtp.socketFactory.port", "465");
props.put("mail.smtp.socketFactory.class",
"javax.net.ssl.SSLSocketFactory");
props.put("mail.smtp.auth", "true");
props.put("mail.smtp.port", "465");
Session session = Session.getDefaultInstance(props,
new javax.mail.Authenticator() {
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication("username","password");
}
});
try {
Message message = new MimeMessage(session);
message.setFrom(new InternetAddress("----#gmail.com"));
message.setRecipients(Message.RecipientType.TO,
InternetAddress.parse("----#gmail.com"));
message.setSubject("Test");
message.setText("Hello");
Transport.send(message);
System.out.println("Done");
} catch (MessagingException e) {
throw new RuntimeException(e);
}
}
}

i got the answer,it's nothing but the port numbers is problem, I'm change and use this two port number 25 (or) 587.

Having trouble sending to Gmail SMTP using javax.mail

I want to send a mail using Gmail's SMTP server. Can you tell me why it won't connect to server when I run the bellow code.
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.MimeMessage;
public class SendTrick {
public static void main(String[] args) {
Properties props = new Properties();
props.put("mail.smtp.host", "465");
props.put("mail.from", "example#gmail.com");
props.put("mail.smtp.host", "smtp.gmail.com");
Session session = Session.getInstance(props, null);
try {
MimeMessage msg = new MimeMessage(session);
msg.setFrom();
msg.setRecipients(Message.RecipientType.TO,
"ex#gmail.com");
msg.setSubject("JavaMail hello world example");
msg.setText("Hello, world!\n");
Transport.send(msg);
} catch (MessagingException mex) {
System.out.println("send failed, exception: " + mex);
}
}
}
The exception in the log is
send failed, exception: javax.mail.MessagingException: Could not
connect to SMTP host: smtp.gmail.com, port: 25; nested exception is:
java.net.ConnectException: Connection refused: connect

You are not setting a mail.smtp.port since there is a duplication typo on the property mail.smtp.host, therefore the default port 25 is being used, as detailed in the the Exception.
GMail's SMTP is not running on port 25, which is why the connection is being refused. From Set up POP in mail clients, it looks like it should be 465 or 587, so you have a valid value but the property key is incorrect.
Edit:
You need use the correct property key for the port:
props.put("mail.smtp.port", "465"); // <-- use the word "port", not "host"
After this is fixed, you may also find authentication issues, as already noted in the comments, unless you have purposely left out the javax.mail.Authenticator code in the question.
Edit 2:
As I mentioned, you might need to specify additional properties to successfully authenticate and be authorised with the SMTP server, for example:
props.put("mail.smtp.starttls.enable", "true");
But, since you are using port 465 for SSL connection you will also need to specify additional SSL properties such as the mail.smtp.socketFactory.class.

Follow this steps:
Disable "Two factor authentication" in Your Email
Navigate to: "https://myaccount.google.com/lesssecureapps?pli=1" and turn on "Access for less secure apps"
Download JavaMail API "https://www.oracle.com/technetwork/java/javamail/index-138643.html" and Add it to your library
CODE
import java.util.Properties;
import javax.mail.Message;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
public class email_try {
public static void main(String ap[]) {
String myEmail = "YOUR EMAIL";
String password = "YOUR PASSWORD";
String opponentEmail = "THEIR EMAIL";
Properties pro = new Properties();
pro.put("mail.smtp.host", "smtp.gmail.com");
pro.put("mail.smtp.starttls.enable", "true");
pro.put("mail.smtp.auth", "true");
pro.put("mail.smtp.port", "587");
Session ss = Session.getInstance(pro, new javax.mail.Authenticator() {
#Override
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication(myEmail, password);
}
});
try {
Message msg = new MimeMessage(ss);
msg.setFrom(new InternetAddress(myEmail));
msg.setRecipients(Message.RecipientType.TO, InternetAddress.parse(opponentEmail));
msg.setSubject("Your Wish");
msg.setText("java email app");
Transport trans = ss.getTransport("smtp");
Transport.send(msg);
System.out.println("message sent");
} catch (Exception e) {
System.out.println(e.getMessage());
}
}
}
TRY THIS CODE AND PUT CORRECT EMAIL ID AND PASSWORD