email - java mail API's Transport function not working -

i tried smtp.gmail.com send mail using java api, when used transport.send(mimemessage) shows error, username , password not accepted.

i had followed link , done everything, still did not work.

then, tried using smtptransport, works.

my question is, why did transport.send() not work , how smtptransport worked.

import java.util.properties; import javax.mail.*; import javax.mail.internet.internetaddress; import javax.mail.internet.mimemessage;  public class email {      email(string from, string pwd, string to, string sub, string msg) {         system.out.println("entered");         properties prop = new properties();         prop.put("mail.smtp.starttls.enable", "true");         prop.put("mail.smtp.host", "smtp.gmail.com");         prop.put("mail.smtp.user", from); // user name         prop.put("mail.smtp.password", pwd); // password         prop.put("mail.smtp.port", "587");         prop.put("mail.smtp.auth", "true");          authenticator = new authenticator() {             protected passwordauthentication getpasswordauthentication() {                 return new passwordauthentication("from", "pwd");             }         };         system.out.println("authenticating");         session ses = session.getdefaultinstance(prop, a);         system.out.println("obtained sesion");         system.out.println(ses);         try {             mimemessage m = new mimemessage(ses);              m.setfrom(new internetaddress(from));             m.addrecipient(message.recipienttype.to, new internetaddress(to));             m.setsubject(sub);             m.settext(msg);             system.out.println("message constructed");             transport.send(m); // / method causes error             system.out.println("transported");             system.out.println("send successfully");         } catch (exception e) {             e.printstacktrace();         }     }      public static void main(string[] args) {         new email("xxxxxxxxxxxxxxxx@gmail.com", "xxxxxx", "xxxxx@gmail.com",                 "javamail", "firstmail");     } } 

you have make mistake passing from , pwd hardcoded passwordauthentication constructor. remove hard coded values , pass from , pwd method.

i have made correction in class given bellow code .

public class email {   email(final string from,final string pwd,string to,string sub,string msg){ ....    authenticator a=new authenticator() { protected passwordauthentication getpasswordauthentication()       {          return new passwordauthentication(from,pwd);        }  };  ...  }