Getting an arrayindexoutofbounds error when trying to run mail app

Question

here is the code, it compiles fine, but when i run it, i get an array
index out of bunds error
import java.util.Properties;
import javax.mail.*;
import javax.mail.internet.*;
public class SimpleSender {
  public static void main (String args[]) throws Exception {
    String host = args[0];
    String from = args[1];
    String to = args[2];
    // Get system properties
    Properties props = System.getProperties();
    // Setup mail server
    props.put("mail.smtp.host", host);
    // Get session
    Session session = Session.getDefaultInstance(props, null);
    // Define message
    MimeMessage message = new MimeMessage(session);
    // Set the from address
    message.setFrom(new InternetAddress(from));
    // Set the to address
    message.addRecipient(Message.RecipientType.TO,
      new InternetAddress(to));
    // Set the subject
    message.setSubject("Hello JavaMail");
    // Set the content
    message.setText("Welcome to JavaMail");
    // Send message
    Transport.send(message);
}this is the error message:
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException
at SimpleSender.main(SimpleSender.java:7)

Answer 1

Which is line 7? I'll bet it's one of these three:  String host = args[0];
  String from = args[1];
  String to = args[2];which would mean you didn't pass enough command-line arguments to your program.