public ArrayList<MailDB> maillist;
public MailDB mail;


public boolean sendMail(String sender, String receiver, String message) throws Exception{
    mail = new MailDB();
    mail.setSender(sender);
    mail.setReceiver(receiver);
    mail.setMessage(message);
    maillist.add(mail); //this sends a nullpointerexception :S
    return true;
}