Marshal called from servlet gives Servlet Exception

Hi, 

         I have a servlet which calls a XMLWriter class which has a method 
to marshall the java object. 
But I am getting an exception : 
[Servlet Error]-[org/exolab/castor/mapping/Mapping]: 
java.lang.NoClassDefFoundError: org/exolab/castor/mapping/Mapping 
at test.AdminServlet.doPost(AdminServlet.java:43) 

I am calling the marshaller in XMLWriter and calling it from AdminServlet 
as: 
XMLwriter writer= new XMLwriter(); 
writer.changePass(user); 

If I run XMLwriter seperately its working fine. I am using the latest 
castor.jar and xerces.jar. 

Can you please let me know what is the problem. 

Thanks 
Deepa 


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