Describe validate() and reset() methods ?

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!!! Struts Frequently Asked Questions !!!

Describe validate() and reset() methods ?

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!!!Answer!!!- From Technical Expert

validate() : Used to validate properties after they have been populated; Called before FormBean is handed to Action. Returns a collection of ActionError as ActionErrors. Following is the method signature for the validate() method.

public ActionErrors validate(ActionMapping mapping, HttpServletRequest request) {

ActionErrors errors = new ActionErrors();
if ( StringUtils.isNullOrEmpty(username) && StringUtils.isNullOrEmpty(password)){
                    errors.add(ActionErrors.GLOBAL_ERROR, new ActionError("error.usernamepassword.required"));
                }
return errors;
}

You have to add the error key from resource bundle.

error.usernamepassword.required : key from resource bundle properties file.

In the JSP , you have to add the below tag to display the error message from validate() method.
<html:errors />

reset(): reset() method is called by Struts Framework with each request that uses the defined ActionForm. The purpose of this method is to reset all of the ActionForm's data members prior to the new request values being set.

Example :
public void reset(ActionMapping mapping, HttpServletRequest request) {

                 this.password = null;
this.username = null;
                 }

Set null for every request.

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!!! Struts Frequently Asked Questions !!!

Describe validate() and reset() methods ?

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!!!Answer!!!- From Technical Expert

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