NullPointerException Occuring randomly when using ExecuteAndWait Interceptor and ServletRequestAware

[JayaKumar An]

Hi Guys... I have a problem which is driving me nuts for the past few weeks.
I have a Servlet with a execute method which implements ServletRequestAware interface.
Also I have used ExecuteAndWait Interceptor to the display the waiting page to the user till the request gets loaded for redirection to a particular url.
When I try to fetch the HttpServletrequest using setServletRequest method in the ServletRequestAware , randomly i get a NullPointerException stating "NullPointerException at Request.getParameterNames()".
Kindly help me out in this issue as the request randomly becomes null at few instances.
Please if any one has faced this issue, provide some solution.