NullPointerException when using an interceptor in Struts 2

Question

This is my WelcomeAction Class

package com.codinghazard.actions;

public class WelcomeAction {

    private String operandA;
    private String          


        

Answer 1

 

    
    
        pages/Result.jsp
        pages/error.jsp

    

try above.

Whenever u ll use any extra interceptor which is not available in default interceptor list of struts2 then explicitly you have to add default stack to avail the functionality of default inteceptos as params or workflow.