ADD JAR LIB TO CLASSPATH FOR TOMCAT

Hello,
I'am running a web application which also operates an automatic sending of mails.
When I run my files on Jbuilder all things are OK.
But when I test my application with Tomcat I have this error:
Error: 500
Location: /ApplicationXTS/servlet/net.projet.ControlCreateObject
Internal Servlet Error:
java.lang.NoClassDefFoundError: javax/mail/MessagingException
     at java.lang.Class.newInstance0(Native Method)
     at java.lang.Class.newInstance(Unknown Source)
     at org.apache.tomcat.core.ServletWrapper.initServlet(ServletWrapper.java:298)
     at org.apache.tomcat.core.ServletWrapper.handleRequest(ServletWrapper.java:445)
     at org.apache.tomcat.core.ServletWrapper.handleRequest(ServletWrapper.java:597)
     at org.apache.tomcat.servlets.InvokerServlet.service(InvokerServlet.java:257)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at org.apache.tomcat.core.ServletWrapper.handleRequest(ServletWrapper.java:503)
     at org.apache.tomcat.core.ContextManager.service(ContextManager.java:559)
     at org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:160)
     at org.apache.tomcat.service.TcpConnectionThread.run(SimpleTcpEndpoint.java:338)
     at java.lang.Thread.run(Unknown Source)
Thank you for your help.
F.S

It seem the required class files are not set in the tomacat classpath.im not sure which version of tomcat u are using.add the corresponding javamail jar files (including activation framework)in ur machine and set classpath accordingly.
HTH.

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