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Struts interview questions

  • Q.What is Action Class? Explain with Example ? view answer
  • Q.How you can do Exception Handling in Struts ? view answer
  • Q. What are the Advantages of Struts ? view answer
  • How Iterate Tag used with a Map ? view answer
  • Q.How does client side validation using validator framework work in struts ? view answer
  • Q. How to do File Upload in Struts ? view answer
  • Q. What is DynaActionForm ? and How you can retrive the value which is set in the JSP Page in case of DynaActionForm ? view answer
  • Q. How to Setup validator framework in Struts ? view answer
  • Q.How does validator framework work in Struts ? view answer
  • What are Validators? and What are Basic Validators provided by the framework ? view answer
  • What is the Benefits of Using the Validator framework in struts ? view answer
  • Q. What is the Difference between DispatchAction and LookupDispatchAction ? view answer
  • Q. What is LookupDispatchAction? view answer
  • Q.How to create a multiple selections list in Struts? and retrive seleted values ? view answer
  • Q.How to create a drop down list in Struts? view answer
  • Q. What is DispatchAction ? view answer
  • Q. What is IncludeAction ? view answer
  • Q. How to Protect JSPs from direct access ? view answer
  • Q. What is ForwardAction ? view answer
  • How does reset() and Validate() method struts work ? view answer
  • Multiple buttons in struts using java script? view answer
  • Integration Struts Spring Hibernate ? view answer
  • Q.Mutli-click prevention using struts tokens with code example. view answer
  • Q. How to prevent mutli-click using struts tokens ? view answer
  • Q.How you will enable front-end validation based on the xml in validation.xml? view answer
  • Q.What is new in ServletRequest interface ? view answer
  • Q.Struts Action Chaining? view answer
  • Q.How can I avoid validating a form before data is entered? view answer
  • Q.Can I have an Action without a form? view answer
  • Q.What is Struts Validator Framework? view answer
  • Q.How you will make available any Message Resources Definitions file to the Struts Framework Environment? view answer
  • Q.What helpers in the form of JSP pages are provided in Struts framework? view answer
  • Q.How you will enable front-end client side validation based on the xml in validation.xml? view answer
  • Q.What design patterns are used in Struts? view answer
  • Q.What is role of Action Class? view answer
  • Q.What is ActionMapping and is the Action Mapping specified? view answer
  • Q.What is the ActionForm and what are important methods in ActionForm? view answer
  • Q.What is role of ActionServlet? view answer
  • Q.What is ActionServlet? view answer
  • What are the components of Struts? view answer
  • What is MVC and how it maps to Struts? view answer
  • How do you get a password field in struts ? view answer
  • Q.Struts Flow In Depth? view answer
  • Q.How does validate() method of ActionForm work ? view answer
  • Q.What are the important sections in Struts Configuration File ? struts-config.xml? view answer
  • Q.How to handle Handling multiple buttons in HTML Form ? view answer
  • Q.How does Value replacement in Message Resource Bundle work? view answer
  • What is SwitchAction? view answer
  • What is difference between LookupDispatchAction and DispatchAction? view answer
  • What is the use of LookupDispatchAction? view answer
  • What is LookupDispatchAction? view answer
  • What is the difference between ForwardAction and IncludeAction? view answer
  • What is IncludeAction? view answer
  • What is the use of ForwardAction? view answer
  • What is DispatchAction? view answer
  • What are the different kinds of actions in Struts? view answer
  • What is the difference between session scope and request scope when saving formbean ? view answer
  • Can we have more than one struts-config.xml file for a single Struts application? view answer
  • In which method of Action class the business logic is executed ? view answer
  • What is role of Action Class? view answer
  • How is the Action Mapping specified ? view answer
  • What is ActionMapping? view answer
  • Describe validate() and reset() methods ? view answer
  • What is role of ActionServlet? view answer
  • What are the core classes of the Struts Framework? view answer
  • What are the components of Struts? view answer
  • How you will enable front-end validation based on the xml in validation.xml? view answer
  • How you will display validation fail errors on jsp page? view answer
  • Give the Details of XML files used in Validator Framework? view answer
  • What is Struts Validator Framework? view answer
  • What is ActionForm? view answer
  • What is Action Class? view answer
  • How you will make available any Message Resources Definitions file to the Struts Framework Environment? view answer
  • What is ActionServlet? view answer
  • Q.How you will display validation fail errors on jsp page? view answer
  • Q.How you will enable front-end client validation based on the xml in validation.xml? view answer

!!! Struts interview questions !!!


Go to Struts Tutorials >>> new

What is Struts Validator Framework?



Validation Framework provides the functionality to validate the form data. It can be use to validate the data on the client side as well as on the server side.

Struts has a class called ValidatorForm in org.apache.struts.validator package. This is a subclass of ActionForm and implements the validate() method. The validate() method invokes the Commons Validator, executes the rules using the two xml files (validator-rules.xml and validation.xml) and generates ActionErrors using the Message Resources defined in the struts-config.xml.
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.
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.


Follow the below steps to setup Validation Framework in Struts (server side validation ).

Step 1. Add validator plugin into 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 page (EmpForm.jsp)- add <html:errors/>

<%@ taglib uri="/WEB-INF/struts-tiles.tld" prefix="tiles" %>
<%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html" %>
<%@ taglib uri="/WEB-INF/struts-bean.tld" prefix="bean" %>
<%@ taglib uri="/WEB-INF/struts-logic.tld" prefix="logic" %>
<html:form>
<html:form action="/submitForm.do" method="post">
<html:errors/> // this is for error message from resource bundle in JSP
<html:text property="firstName" size="20" maxlength="50"/>
<html:text property="lastName" size="20" maxlength="50"/>
<html:submit >Save</html:submit>
</html:form>


Step 4. Add Message Resources location in struts-config.xml

<!-- Message Resources --> <message-resources parameter="application_resource"/>

Step 5. In the the Resource Bundle. application_resource.properties file //Here you can add localization.

label.firstName=First Name
label.lastName=Last Name
errors.required={0} is required.


Step 7. In the EmpForm

package com.techfaq.form;
public class EmpForm extends ValidatorForm {
int empId;
String firstName;
String lastName;
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public int getEmpId() {
return empId;
}
public void setEmpId(int empId) {
this.empId = empId;
}
}

Step 6. In the validation.xml - The validation.xml file is where you couple the individual Validators defined in the validator-rules.xml to components within your application

<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>


Step 6. In the validator-rules.xml - The validator-rules.xml file defines the Validator definitions available for a given application.

<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>


Step 5. Add Action mapping and form entry into the stuts-confix.xml and validate="true" is for validation framework to validate the form input.

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.1//EN"
"http://jakarta.apache.org/struts/dtds/struts-config_1_1.dtd">
<struts-config>
<form-beans>
<form-bean name="empForm" type="com.techfaq.form.EmpForm"> </form-bean>
</form-beans>
<action-mappings>
<action path="/submitForm"
type="com.techfaq.action.EmpAction"
name="empForm"
scope="request"
validate="true" // This need for validation framework to validate the form input
input="EmpForm.jsp">
<forward name="success"
path="success.jsp"/>
<forward name="failure" path="failure.jsp" />
</action>
</action-mappings>
</struts-config>


Now in the browser type http://localhost:8080/testApp/EmpForm.jsp

Don't Enter firstName and lastName in the text box and submit the "Save" BUTTON. the RequestProcessor checks for the validateattribute in the ActionMapping.
If the validate is set to true, the RequestProcessor invokes the validate() method of the ValidatorForm instance.
If Validate fail the RequestProcessor looks for the input attribute and return to JSP page mentioned in input tag.
If Validate pass goto Action Class execute() method..
If Validate fail , In the browser (EmpForm.jsp) you can see. In red color.


First Name is required.
Last Name is required.


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

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