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Q. How to Setup validator framework in Struts ?
Step 1.
place validator-rules.xml and validation.xml in the WEB-INF directory.

Step 2.
Add the blow lines to struts-config.xml
<plug-in className="org.apache.struts.validator.ValidatorPlugIn">
<set-property property="pathnames" value="/WEB-INF/validator-rules.xml,
/WEB-INF/validation.xml"/>
</plug-in>

Step 3.
In the jsp add the tag
<html:errors />

Step 4.
Add
struts.jar
commons-beanutils.jar
commons-collections.jar
commons-digester.jar
commons-fileupload.jar
commons-lang.jar
commons-logging.jar
commons-validator.jar

into WEB-INF/lib directory

Explanation :

There are two configuration files used.
One if called validator-rules.xml and the other is validation.xml.
This is example of server side validation :


validator-rules.xml :

The validator-rules.xml file defines the Validator definitions available for a given application.
The validator-rules.xml file acts as a template, defining all of the possible Validators that are available to an application.
Example validator-rules.xml File :
<form-validation>
<global>
<validator
name="required"
classname="org.apache.struts.util.StrutsValidator"
method="validateRequired"
methodparams="java.lang.Object,
org.apache.commons.validator.ValidatorAction,
org.apache.commons.validator.Field,
org.apache.struts.action.ActionErrors,
javax.servlet.http.HttpServletRequest"
msg="errors.required"/>

</global>
</form-validation>

validation.xml File :
The validation.xml file is where you couple the individual Validators defined in the validator-rules.xml to components within your application.
validation.xml File

<form-validation>
<formset>
<form name="empForm">
<field
property="firstName"
depends="required">
<arg0 key="label.firstName"/>
</field>

<field
property="lastName"
depends="required">
<arg0 key="label.lastName"/>
</field>
</form>
</formset>
</form-validation>

In the empForm firstName and lastName are the required filed.
So in the above configuration you can see we add for both firstName and lastName.
You can see depends="required" - "required" property is defind in validator-rules.xml.

In the resource bundle : application_resource.propertis file
label.firstName=First Name
label.lastName=Last Name

#Error messages used by the Validator
errors.required={0} is required.

Based on the validation.xml File configuration .
Error in jsp will be :
First Name is required.
Last Name is required.

{0} will be filled by (First Name or Last Name) because validation.xml above configuration you have defind <arg0 key="label.firstName"/>.

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