What's wrong with this code

Question

I am getting the compiler error. Can anybody debug this?

import javax.mail.*;
import javax.mail.internet.*;
import java.util.*;
public class SendMail
{
  public static void main(String [] args)
  {
    SendMail sm=new SendMail();
     sm.postMail("[email protected]","hi","hello","[email protected]");
   }

public void postMail( String recipients[ ], String subject, String message , String from) throws MessagingException
{
    boolean debug = false;

     //Set the host smtp address
     Properties props = new Properties();
     props.put("mail.smtp.host", "webmail.emailmyname.com");

    // create some properties and get the default Session
    Session session = Session.getDefaultInstance(props, null);
    session.setDebug(debug);

    // create a message
    Message msg = new MimeMessage(session);

    // set the from and to address
    InternetAddress addressFrom = new InternetAddress(from);
    msg.setFrom(addressFrom);

    InternetAddress[] addressTo = new InternetAddress[recipients.length]; 
    for (int i = 0; i < recipients.length; i++)
    {
        addressTo[i] = new InternetAddress(recipients[i]);
    }
    msg.setRecipients(Message.RecipientType.TO, addressTo);


    // Optional : You can also set your custom headers in the Email if you Want
    msg.addHeader("MyHeaderName", "myHeaderValue");

    // Setting the Subject and Content Type
    msg.setSubject(subject);
    msg.setContent(message, "text/plain");
    Transport.send(msg);
}
}

Answer 1

Your postMail function is expecting the first parameter, recipients to be an array of Strings, but in your main method you are passing a String literal. The compiler is telling you that it's unable to find a version of the postMail method that matches a parameter-list like (String, String, String, String).

Try calling it like this instead:

sm.postMail(new String[]{"[email protected]"},"hi","hello","[email protected]");

Another idea would be to make an overloaded version of your postMail method if this is something you intend to do often.

Answer 2

Make sure that you've included mail.jar and activation.jar to your classpath.

Answer 3

You must specify the main class in the manifest file.