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Q.How does validate() method of ActionForm work ?

<action path="/submitDetails"
type="mybank.example.CustomerAction"
name="CustomerForm"
scope="request"
validate="true"
input="CustomerDetailForm.jsp">
<forward name="success"
path="ThankYou.jsp"
redirect=?true?/>
<forward name="failure" path="error.jsp" />
</action>

RequestProcessor checks for the validate attribute in the
ActionMapping. If the validate is set to true, the RequestProcessor invokes
the validate() method on the CustomerForm instance. This is the method
where you can put all the html form data validations. If any error then
RequestProcessor checks for the input attribute in the ActionMapping
and forward to page mentioned in the input tag.
If no error in validate() method then continue.

and Validate() method looks like
public ActionErrors validate(ActionMapping mapping,
HttpServletRequest request)
{
// Perform validator framework validations
ActionErrors errors = new ActionErrors();
// Only need crossfield validations here
if (parent == null) {
errors.add(ActionErrors.GLOBAL_ERROR,
new ActionError("error.custform"));
}
if (firstName == null) {
errors.add(ActionErrors.GLOBAL_ERROR,
new ActionError("error.firstName.null"));
}
return errors;
}

where error.custform and error.firstName.null keys from Message Resource Bundle.

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