Following error message I get for the code

bp.setDataHandler(new DataHandler(new FileDataSource(filename)));

Error message is as follows :

Servlet Error]-[Class javax/activation/DataHandler violates loader constraints:
definition mismatch between parent and child loaders]:
java.lang.LinkageError: Class javax/activation/DataHandler violates loader constraints:
definition mismatch between parent and child loaders

If anyboyd knows the reason and solution.

This is for sending the html content mail.

Thanks ,
Pradeep