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Placement Papers & Technical Interview Questions |
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EJB Interview questions
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What is Jakarta Struts Framework?
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Jakarta Struts is open source
implementation of MVC
(Model-View-Controller) pattern for
the development of web based
applications. Jakarta Struts is
robust architecture and can be used
for the development of application
of any size. Struts framework makes
it much easier to design scalable,
reliable Web applications with Java.
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What is ActionServlet?
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The class
org.apache.struts.action.ActionServlet
is the called the
ActionServlet. In the the Jakarta
Struts Framework this class plays
the role of controller. All the
requests to the server goes through
the controller. Controller is
responsible for handling all the
requests.
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How you will make available any
Message Resources Definitions file
to the Struts Framework Environment?
- Message Resources Definitions file
are simple .properties files and
these files contains the messages
that can be used in the struts
project. Message Resources
Definitions files can be added to
the struts-config.xml file through
<message-resources /> tag.
Example:
<message-resources
parameter=”MessageResources” />
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What is Action Class?
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The Action Class is part of the
Model and is a wrapper around the
business logic. The purpose of
Action Class is to translate the
HttpServletRequest to the business
logic. To use the Action, we need
to Subclass and overwrite the
execute() method. In the Action
Class all the database/business
processing are done. It is advisable
to perform all the database related
stuffs in the Action Class. The
ActionServlet (commad) passes the
parameterized class to Action Form
using the execute() method. The
return type of the execute method is
ActionForward which is used by the
Struts Framework to forward the
request to the file as per the value
of the returned ActionForward
object.
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Write code of any Action Class?
Here is the code of Action Class
that returns the ActionForward
object.
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
public class TestAction extends Action
{
public ActionForward execute(
ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response) throws Exception
{
return mapping.findForward(\"testAction\");
}
}
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What is ActionForm?
An ActionForm is a JavaBean that
extends
org.apache.struts.action.ActionForm.
ActionForm maintains the session
state for web application and the
ActionForm object is automatically
populated on the server side with
data entered from a form on the
client side.
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What is Struts Validator
Framework?
Struts Framework provides the
functionality to validate the form
data. It can be use to validate the
data on the users browser as well as
on the server side. Struts Framework
emits the java scripts and it can be
used validate the form data on the
client browser. Server side
validation of form can be
accomplished by sub classing your
From Bean with DynaValidatorForm
class. The Validator framework was
developed by David Winterfeldt as
third-party add-on to Struts. Now
the Validator framework is a part of
Jakarta Commons project and it can
be used with or without Struts. The
Validator framework comes integrated
with the Struts Framework and can be
used without doing any extra
settings.
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Give the Details of XML files
used in Validator Framework? -
The Validator Framework uses two XML
configuration files
validator-rules.xml and
validation.xml. The
validator-rules.xml defines the
standard validation routines, these
are reusable and used in
validation.xml. to define the form
specific validations. The
validation.xml defines the
validations applied to a form bean.
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How you will display validation
fail errors on jsp page? - The
following tag displays all the
errors:
<html:errors/>
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How you will enable front-end
validation based on the xml in
validation.xml? - The
<html:javascript> tag
to allow front-end validation based
on the xml in validation.xml. For
example the code:
<html:javascript
formName=”logonForm”
dynamicJavascript=”true”
staticJavascript=”true” />
generates the client side
java script for the form “logonForm”
as defined in the validation.xml
file. The
<html:javascript>
when added in the jsp file generates
the client site validation script.
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