Preventing tomcat from creating sessions

Hi;
  I am writing a set of RESTful services. client do not send cookies and we
don't want to user URL rewriting for most
of the services (they are just stateless).
The issue is when the client calls   http://localhost/services/resource say
n times, the application server/servlet container creates n sessions !
How do i prevent that from happening ?
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Regards, Youssef