JavaMail NoClassDefFoundError

Question

The following code complies OK but won't run. I get a ava.lang.NoClassDefFoundError: . What's my problem?
import java.util.Properties;
import javax.mail.*;
import javax.mail.internet.*;
public class SendMail {
public static void main (String[] args) throws Exception {
String host = "mail.xxxxx.com";
String from = "[email protected]";
Address address = new InternetAddress("[email protected]")
Properties props = System.getProperties();
props.put("mail.smtp.host", host);
Session session = Session.getDefaultInstance(props, null);
MimeMessage message = new MimeMessage(session);
message.setFrom(new InternetAddress(from));
message.setRecipients(Message.RecipientType.TO,
address);
message.setSubject("Hello JavaMail");
message.setText("Welcome to JavaMail");
Transport.send(message);
}

Answer 1

Probably forgot to set the class path so it can find the javax.mail package. If it works when you compile, then make sure you got the same classpath when you run it. Then there should be no problem.