problem in ValidatorSupport

[garima jain]

I am writing a small application for Online Test using struts 2.0. I wrote a custom validator class to do validation on the login screen. Following is the code for that:

   import java.util.Map;

 

import org.apache.struts2.interceptor.SessionAware;

 

import com.opensymphony.xwork2.validator.ValidationException; 

import com.opensymphony.xwork2.validator.validators.ValidatorSupport;

public class InfomatchValidator extends ValidatorSupport implements SessionAware  {

 

      private Map sessionMap;

 

      public void validate(Object object) throws ValidationException {

            

            if (sessionMap.get("username") == "NF") //line no 13

            {

                  addActionError("Login failed.");

            }

      }

 

      public void setSession(Map<String, Object> sessionMap) {

            this.sessionMap=sessionMap;

      }

 

If I run my application, it gives NPE on sessionMap at line no 13 . That means, struts is not initializing sessionMap variable using its setSession method. Could you please explain the reason for such behaviour.

[David Newton]

Validators aren't actions--implementing SessionAware means nothing to a validator. SessionAware is for actions.

[garima jain]

thanks David