Error: SHA1 digest error for javax/mail/Authenticator.class

Question

I am using javax.mail api to sending emails.
when I calls main method of the class to send email its works perfect, but when I imports the same class in jsp its shows me above said error.
My email server requires authentication before sending mails.
please guide me how to use this class in jsp .
class code is as below :
=========================
import javax.mail.*;
import javax.mail.internet.*;
import java.util.*;
import java.io.*;
public class SendMailUsingAuthentication
private static final String SMTP_HOST_NAME = "myserver.smtphost.com";
private static final String SMTP_AUTH_USER = "myusername";
private static final String SMTP_AUTH_PWD = "mypwd";
private static final String emailMsgTxt = "Online Order Confirmation Message. Also include the Tracking Number.";
private static final String emailSubjectTxt = "Order Confirmation Subject";
private static final String emailFromAddress = "[email protected]";
// Add List of Email address to who email needs to be sent to
private static final String[] emailList = {"[email protected]", "[email protected]"};
public static void main(String args[]) throws Exception
SendMailUsingAuthentication smtpMailSender = new SendMailUsingAuthentication();
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;
//Set the host smtp address
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);
// 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);
msg.setRecipients(Message.RecipientType.TO, addressTo);
// Setting the Subject and Content Type
msg.setSubject(subject);
msg.setContent(message, "text/plain");
Transport.send(msg);
* SimpleAuthenticator is used to do simple authentication
* when the SMTP server requires it.
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);

Answer 1

Find all the jar files under Tomcat's installation directory and all the jar files in the jre/lib/ext directory.
Make sure only one of them includes javax.mail.* classes.
Note that setting CLASSPATH to a directory does not cause all jar files in that directory to be loaded.
Finally, make sure Eclipse isn't copying the class files out of mail.jar and packaging them with your
application.