"sending email via gmail smtp server in java" Code Answer

here i am giving some changes, that work fine for me:

session session = session.getinstance(props,null);

you instantiate message object as you did. and finally:

transport transport = session.gettransport("smtp");
string mfrom = "yourgmailusernamewithout@"// example laabidiraissi 
transport.connect("smtp.gmail.com", mfrom, "thepassword");
transport.sendmessage(message, message.getallrecipients());

edit, would you please give me a favor and copy/paste and try this example and show what it displays:

package com.test;

import java.util.properties;

import javax.mail.bodypart;
import javax.mail.message;
import javax.mail.messagingexception;
import javax.mail.multipart;
import javax.mail.session;
import javax.mail.transport;
import javax.mail.internet.addressexception;
import javax.mail.internet.internetaddress;
import javax.mail.internet.mimebodypart;
import javax.mail.internet.mimemessage;
import javax.mail.internet.mimemultipart;

import org.junit.test;

public class emailservice {

@test
public void test(){
    properties props = system.getproperties();
    props.put("mail.smtp.starttls.enable", true); // added this line
    props.put("mail.smtp.host", "smtp.gmail.com");
    props.put("mail.smtp.user", "username");
    props.put("mail.smtp.password", "password");
    props.put("mail.smtp.port", "587");
    props.put("mail.smtp.auth", true);



    session session = session.getinstance(props,null);
    mimemessage message = new mimemessage(session);

    system.out.println("port: "+session.getproperty("mail.smtp.port"));

    // create the email addresses involved
    try {
        internetaddress from = new internetaddress("username");
        message.setsubject("yes we can");
        message.setfrom(from);
        message.addrecipients(message.recipienttype.to, internetaddress.parse("receivermail"));

        // create a multi-part to combine the parts
        multipart multipart = new mimemultipart("alternative");

        // create your text message part
        bodypart messagebodypart = new mimebodypart();
        messagebodypart.settext("some text to send");

        // add the text part to the multipart
        multipart.addbodypart(messagebodypart);

        // create the html part
        messagebodypart = new mimebodypart();
        string htmlmessage = "our html text";
        messagebodypart.setcontent(htmlmessage, "text/html");


        // add html part to multi part
        multipart.addbodypart(messagebodypart);

        // associate multi-part with message
        message.setcontent(multipart);

        // send message
        transport transport = session.gettransport("smtp");
        transport.connect("smtp.gmail.com", "username", "password");
        system.out.println("transport: "+transport.tostring());
        transport.sendmessage(message, message.getallrecipients());


    } catch (addressexception e) {
        // todo auto-generated catch block
        e.printstacktrace();
    } catch (messagingexception e) {
        // todo auto-generated catch block
        e.printstacktrace();
    }
}
}