It looks like Vijaya is using Struts 1. Vijaya, two issues I noticed were:
1) The Struts Action class has an execute method defined with these parameters in this order: (ActionMapping mapping, ActionForm form, HttpServletRequest req, HttpServletResponse res). However, your execute method has the ActionForm parameter declared first followed by the ActionMapping parameter.
2) You haven't shown your view using a path mapped to your Action class (i.e. does the jsp you are using to invoke this Action class have the form action value set to helloWorld.do?).
Joined: Nov 29, 2012
Its working fine now..
The only change made was the sequence of the execute method parameters.