when I run the code from the book "Professional Java Server Pages" page no.260
(SendMail Servlet) , the code compiles properly, but at run time an exception
is thrown.
It is of type java.lang.nullpointer.
On testing i found that the error is coming on the line with the code

Session session = Session.getInstance(properties,null);

I am trying to write a servlet to send across the mail I write.
please help me solve this problem.

yours sincerely
Rajeev Iyer