how create package of this java code

Hi,i have email code in java which is working fine with out making package but when i want to make package of this code its stop working.Its showing exception while I execute it.I have to use this code in jsp to send mail. please help , my code is....

package javap;
import javax.mail.*;
import javax.mail.internet.*;
import java.util.*;
import java.io.*;



public class sendmail
{

  private static final String SMTP_HOST_NAME = "smtp.gmail.com";
  private static final String SMTP_AUTH_USER = "abc";
  private static final String SMTP_AUTH_PWD  = "xyz";

  private static final String emailMsgTxt      = "this is test mail";
  private static final String emailSubjectTxt  = " Subject";
  private static final String emailFromAddress = "abc";

  // Add List of Email address to who email needs to be sent to
  private static final String[] emailList = {"xyz.com"};

  public static void main(String args[]) throws Exception
  {
    sendmail smtpMailSender = new sendmail();
    smtpMailSender.postMail( emailList, emailSubjectTxt, emailMsgTxt, emailFromAddress);
    System.out.println("Sucessfully Sent mail to All Users");
  }

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


     Properties props = new Properties();
     props.put("mail.smtp.host", SMTP_HOST_NAME);
     props.put("mail.smtp.auth", "true");

    Authenticator auth = new SMTPAuthenticator();
    Session session = Session.getDefaultInstance(props, auth);

    session.setDebug(debug);


    Message msg = new MimeMessage(session);


    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);



    msg.setSubject(subject);
    msg.setContent(message, "text/plain");
    Transport.send(msg);
 }


private class SMTPAuthenticator extends javax.mail.Authenticator
{

    public PasswordAuthentication getPasswordAuthentication()
    {
        String username = SMTP_AUTH_USER;
        String password = SMTP_AUTH_PWD;
        return new PasswordAuthentication(username, password);
    }
}

}