Little problem on sending an email, can you take a look ?

Question

Hello!
I wuld like to know why I'm getting the following exception
everytime i try to send an email from a servlet with the classes below:
package radio.email;
import java.io.BufferedReader;
import java.io.File;
import java.io.InputStreamReader;
import java.util.Date;
import java.util.Properties;
import javax.activation.DataHandler;
import javax.activation.DataSource;
import javax.activation.FileDataSource;
import javax.mail.Folder;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Multipart;
import javax.mail.Session;
import javax.mail.Store;
import javax.mail.Transport;
import javax.mail.internet.AddressException;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;
import radio.email.SMTPAuthenticator;
public class SendEmail {
     public void send(String smtpHost, String smtpPort, String smtpUser, String passWord, String from,
                String[] to, String subject, String content, File[] attachsFile )throws MessagingException, AddressException {
          try{
               //Create a mail session
               Properties props = new Properties();
               props.put("mail.smtp.host", smtpHost);
               props.put("mail.smtp.port", "" + smtpPort);
               props.put("mail.smtp.auth", "true");
               SMTPAuthenticator auth = new SMTPAuthenticator( smtpUser, passWord );
               //Session session = Session.getDefaultInstance(props, auth);
               Session session = Session.getInstance(props, auth);
                        session.setDebug(true);
               // Construct the message
               Message msg = new MimeMessage(session);
               msg.setSentDate( new Date() );
               msg.setFrom(new InternetAddress(from));
               InternetAddress[] addressTo = new InternetAddress[to.length];
               for (int i = 0; i < to.length; i++) {
                    addressTo[i] = new InternetAddress( to[i] );
               msg.setRecipients(Message.RecipientType.TO, addressTo);
               msg.setSubject(subject);
               msg.setHeader("Disposition-Notification-To", from);
               // create the message part
                  MimeBodyPart messageBodyPart = new MimeBodyPart();
                  //fill message
                  messageBodyPart.setContent( content, "text/plain");
                  Multipart multipart = new MimeMultipart();
                     multipart.addBodyPart(messageBodyPart);
                  if ( attachsFile != null &&  attachsFile[0] != null ){
                       for ( int i = 0; i < attachsFile.length; i++ ){
                        messageBodyPart = new MimeBodyPart();
                    DataSource source = null;
                        source = new FileDataSource( attachsFile[i] );
                        messageBodyPart.setDataHandler( new DataHandler(source) );
                        messageBodyPart.setFileName( source.getName() );
                        multipart.addBodyPart(messageBodyPart);
                  //set the content
                  msg.setContent( multipart );
               // Send the message
               Transport.send(msg);                      
          }catch( Exception e ) {
               e.printStackTrace();
               //throw new SacException();
        }My servlet
new radio.email.SendEmail().send("smtp.mail.yahoo.com.br", "587", "myuser", "xxxxxx",
                    "Marcos", to, "Web R�dio Contato", content, null);The Exception:
exception
javax.servlet.ServletException: Servlet execution threw an exception
     org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:362)
     com.sun.faces.context.ExternalContextImpl.dispatch(ExternalContextImpl.java:322)
     com.sun.faces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:130)
     com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:87)
     com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:200)
     com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:117)
     javax.faces.webapp.FacesServlet.service(FacesServlet.java:198)
     org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:362)
root cause
java.lang.NoClassDefFoundError: javax/activation/DataSource
     radio.servlets.SendEmailServlet.processRequest(SendEmailServlet.java:54)
     radio.servlets.SendEmailServlet.doGet(SendEmailServlet.java:121)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
     org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:362)
     com.sun.faces.context.ExternalContextImpl.dispatch(ExternalContextImpl.java:322)
     com.sun.faces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:130)
     com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:87)
     com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:200)
     com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:117)
     javax.faces.webapp.FacesServlet.service(FacesServlet.java:198)
     org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:362)I'm importing the class "javax.activation.dataSource" properly, so What's wrong?
Thanks for helping!!

Answer 1

This has nothing to do with importing, which only effects compilation,
and everything to do with server configuration, especially CLASSPATH.
Start with these FAQ entries:
http://java.sun.com/products/javamail/FAQ.html#servletconfig
http://java.sun.com/products/javamail/FAQ.html#servletcp