DynaBean and BeanUtils
Another major complaint usually heard amongst Struts 1.0 users is the extensive effort involved in writing the FormBean (a.k.a. ActionForm) classes.
Struts provides two-way automatic population between HTML forms and Java objects, the FormBeans. To take advantage of this however, you have to write one FormBean per HTML form. (In some use cases, a FormBean can actually be shared between multiple HTML forms. But those are specific cases.) Struts' FormBean standard follows faithfully the verbose JavaBean standard to define and access properties. Besides, to encourage a maintainable architecture, Struts enforces a pattern such that it is very difficult to 'reuse' a model-layer object (e.g. a ValueObject from the EJB tier) as a FormBean. Combining all these factors, a developer has to spend a significant amount of time to write tedious getters/setters for all the FormBean classes.
Struts 1.1 offers an alternative, Dynamic ActionForms, which are based on DynaBeans. Simply put, DynaBeans are type-safe name-value pairs (think HashMaps) but behave like normal JavaBeans with the help of the BeanUtils library. (Both the DynaBeans and the BeanUtils library were found to be useful and generic enough that they have been 'promoted' into Jakarta's Commons project.) With Dynamic ActionForms, instead of coding the tedious setters/getters, developers can declare the required properties in the struts-config.xml files. Struts will instantiate and initialize Dynamic ActionForm objects with the appropriate metadata. From then onwards, The Dynamic ActionForm instance is treated as if it is an ordinary JavaBean by Struts and the BeanUtils library.
Another major complaint usually heard amongst Struts 1.0 users is the extensive effort involved in writing the FormBean (a.k.a. ActionForm) classes.
Struts provides two-way automatic population between HTML forms and Java objects, the FormBeans. To take advantage of this however, you have to write one FormBean per HTML form. (In some use cases, a FormBean can actually be shared between multiple HTML forms. But those are specific cases.) Struts' FormBean standard follows faithfully the verbose JavaBean standard to define and access properties. Besides, to encourage a maintainable architecture, Struts enforces a pattern such that it is very difficult to 'reuse' a model-layer object (e.g. a ValueObject from the EJB tier) as a FormBean. Combining all these factors, a developer has to spend a significant amount of time to write tedious getters/setters for all the FormBean classes.
Struts 1.1 offers an alternative, Dynamic ActionForms, which are based on DynaBeans. Simply put, DynaBeans are type-safe name-value pairs (think HashMaps) but behave like normal JavaBeans with the help of the BeanUtils library. (Both the DynaBeans and the BeanUtils library were found to be useful and generic enough that they have been 'promoted' into Jakarta's Commons project.) With Dynamic ActionForms, instead of coding the tedious setters/getters, developers can declare the required properties in the struts-config.xml files. Struts will instantiate and initialize Dynamic ActionForm objects with the appropriate metadata. From then onwards, The Dynamic ActionForm instance is treated as if it is an ordinary JavaBean by Struts and the BeanUtils library.
Validator
The Validator is not exactly a new feature. The Validator has been in the contrib package in the distribution since Struts 1.0.1. Since then, part of it has now been refactored and moved into the Jakarta-Commons subproject and renamed the Commons-Validator and the Struts specific portion is now called the Struts-Validator. However, since it is in the contrib package, people may overlook it and it is worthwhile to mention it here.
The Validator provides an extensible framework to define validation rules to validate user inputs in forms. What is appealing in the Validator is that it generates both the server-side validation code and the client-side validation code (i.e. Javascript) from the same set of validation rules defined in an XML configuration file. The Validator performs the validation based on regular-expression pattern matching. While a handful of commonly used validators are shipped with the framework (e.g. date validator, range validator), you can always define your own ones to suit your need.
Default Sub-application
To maintain backward compatibility, Struts 1.1 allows one default sub-application per application. The URI of the resources (i.e. JSPs, HTMLs, etc) in the default sub-application will have an empty sub-app prefix. This means when an existing 1.0 application is "dropped" into Struts 1.1, theoretically, it will automatically become the default sub-application.
Direct Requests to JSPs
To take the full advantage of sub-application support, Struts 1.1 stipulates the requirement that all requests must flow through the controller servlet, i.e. the ActionServlet. Effectively, this means all JSPs must be fronted by Actions. Instead of allowing direct requests to any of the JSPs, all requests must go through an Action and let the Action forward to the appropriate JSP.
This is perhaps the biggest impact of migration to Struts 1.1 if you have not followed this idiom in your applications. This restriction is required because without going through the ActionServlet, Struts navigation taglibs (e.g. <html:form> and <html:link>) used in the JSPs will not have the correct sub-app context to work with.
The Validator is not exactly a new feature. The Validator has been in the contrib package in the distribution since Struts 1.0.1. Since then, part of it has now been refactored and moved into the Jakarta-Commons subproject and renamed the Commons-Validator and the Struts specific portion is now called the Struts-Validator. However, since it is in the contrib package, people may overlook it and it is worthwhile to mention it here.
The Validator provides an extensible framework to define validation rules to validate user inputs in forms. What is appealing in the Validator is that it generates both the server-side validation code and the client-side validation code (i.e. Javascript) from the same set of validation rules defined in an XML configuration file. The Validator performs the validation based on regular-expression pattern matching. While a handful of commonly used validators are shipped with the framework (e.g. date validator, range validator), you can always define your own ones to suit your need.
Default Sub-application
To maintain backward compatibility, Struts 1.1 allows one default sub-application per application. The URI of the resources (i.e. JSPs, HTMLs, etc) in the default sub-application will have an empty sub-app prefix. This means when an existing 1.0 application is "dropped" into Struts 1.1, theoretically, it will automatically become the default sub-application.
Direct Requests to JSPs
To take the full advantage of sub-application support, Struts 1.1 stipulates the requirement that all requests must flow through the controller servlet, i.e. the ActionServlet. Effectively, this means all JSPs must be fronted by Actions. Instead of allowing direct requests to any of the JSPs, all requests must go through an Action and let the Action forward to the appropriate JSP.
This is perhaps the biggest impact of migration to Struts 1.1 if you have not followed this idiom in your applications. This restriction is required because without going through the ActionServlet, Struts navigation taglibs (e.g. <html:form> and <html:link>) used in the JSPs will not have the correct sub-app context to work with.
ActionServlet Configurations
With the introduction of sub-applications, a more flexible way is introduced to configure each sub-application independently. Many of the configuration entries (e.g. resource bundle location, maximum upload file size, etc) that used to be defined in web.xml have now been moved to struts-config.xml. The original entries in web.xml are deprecated but will still be effective.
Action.execute() and Action.getResources()
In Struts 1.0, request handling logic is coded in Action.perform(); however, Action.perform() throws only IOException and SevletException. To facilitate the new declarative exception handling , the request handling method needs to throw Exception, the superclass of all the checked exceptions. Therefore, to both maintain backward compatibility and facilitate declarative exception handling, Action.perform() is now deprecated in favour of Action.execute().
You also have to be careful if you use DispatchAction in your existing applications. At the time of writing, the DispatchAction in Struts 1.1 beta has not yet been updated to use execute(). (A bug report has been filed in Struts' bug database.) Therefore, without modifying the DispatchAction class yourself, declarative exception handling will not work with DispatchAction subclasses.
In addition, Action.getResources() is now deprecated. Instead, you should call Action.getResources(HttpServletRequest) instead. This allows Struts to return to you the sub-application specific message resources. Otherwise, the message resources for the default sub-app will be used.
Library Dependency
Struts 1.1 now depends on a handful of libraries from other Jakarta subprojects (e.g. Commons-Logging, Commons-Collections, etc.). Some of these libraries may cause classloading conflicts in some servlet containers. So far, people have reported in the mailing list the classloading problem of commons-digester/jaxp1.1, and commons-logging causing deployment difficulties in Struts 1.1 applications running on Weblogic 6.0. (The problems have been corrected in Weblogic 6.1 and 7.0.)
Resources under WEB-INF
According to the Servlet specification, resources (e.g. JSP files) stored under WEB-INF are protected and cannot be accessed directly by the browsers. One design idiom for Struts 1.0 is to put all the JSP files under WEB-INF and front them by Actions so that clients cannot illegally access the JSPs. With the introduction of sub-application prefixes in Struts 1.1, mapping resources under WEB-INF gets complicated. Extra configuration steps utilizing the pagePattern and forwardPattern attributes of the element in struts-config.xml is required to inform Struts to construct the paths correctly. More specifically, you need to set these attributes to the pattern "/WEB-INF/$A$P".
With the introduction of sub-applications, a more flexible way is introduced to configure each sub-application independently. Many of the configuration entries (e.g. resource bundle location, maximum upload file size, etc) that used to be defined in web.xml have now been moved to struts-config.xml. The original entries in web.xml are deprecated but will still be effective.
Action.execute() and Action.getResources()
In Struts 1.0, request handling logic is coded in Action.perform(); however, Action.perform() throws only IOException and SevletException. To facilitate the new declarative exception handling , the request handling method needs to throw Exception, the superclass of all the checked exceptions. Therefore, to both maintain backward compatibility and facilitate declarative exception handling, Action.perform() is now deprecated in favour of Action.execute().
You also have to be careful if you use DispatchAction in your existing applications. At the time of writing, the DispatchAction in Struts 1.1 beta has not yet been updated to use execute(). (A bug report has been filed in Struts' bug database.) Therefore, without modifying the DispatchAction class yourself, declarative exception handling will not work with DispatchAction subclasses.
In addition, Action.getResources() is now deprecated. Instead, you should call Action.getResources(HttpServletRequest) instead. This allows Struts to return to you the sub-application specific message resources. Otherwise, the message resources for the default sub-app will be used.
Library Dependency
Struts 1.1 now depends on a handful of libraries from other Jakarta subprojects (e.g. Commons-Logging, Commons-Collections, etc.). Some of these libraries may cause classloading conflicts in some servlet containers. So far, people have reported in the mailing list the classloading problem of commons-digester/jaxp1.1, and commons-logging causing deployment difficulties in Struts 1.1 applications running on Weblogic 6.0. (The problems have been corrected in Weblogic 6.1 and 7.0.)
Resources under WEB-INF
According to the Servlet specification, resources (e.g. JSP files) stored under WEB-INF are protected and cannot be accessed directly by the browsers. One design idiom for Struts 1.0 is to put all the JSP files under WEB-INF and front them by Actions so that clients cannot illegally access the JSPs. With the introduction of sub-application prefixes in Struts 1.1, mapping resources under WEB-INF gets complicated. Extra configuration steps utilizing the pagePattern and forwardPattern attributes of the element in struts-config.xml is required to inform Struts to construct the paths correctly. More specifically, you need to set these attributes to the pattern "/WEB-INF/$A$P".
What is the
Jakarta Struts Framework?
Jakarta Struts is an open source implementation of MVC
(Model-View-Controller) pattern for the development of web based applications.
Jakarta Struts is a robust architecture and can be used for the development of applications of any size.
The “Struts framework” makes it easier to design scalable, reliable Web applications.
Jakarta Struts is an open source implementation of MVC
(Model-View-Controller) pattern for the development of web based applications.
Jakarta Struts is a robust architecture and can be used for the development of applications of any size.
The “Struts framework” makes it easier to design scalable, reliable Web applications.
What is an ActionServlet?
The class org.apache.struts.action.ActionServlet is called the ActionServlet.
In the Jakarta Struts Framework this class plays the role of controller.
All the requests to the server go through the “Controller”.
The “Controller” is responsible for handling all the requests.
The class org.apache.struts.action.ActionServlet is called the ActionServlet.
In the Jakarta Struts Framework this class plays the role of controller.
All the requests to the server go through the “Controller”.
The “Controller” is responsible for handling all the requests.
How can one make any “Message Resources”
definitions file available to the “Struts Framework” environment?
Answer: “Message Resources” definitions file are simple .properties files and
these files contain the messages that can be used in the struts project.
“Message Resources” definition files can be added to the struts-config.xml file
through <message-resources /> tag. Example:
<message-resources parameter="MessageResources" />
Answer: “Message Resources” definitions file are simple .properties files and
these files contain the messages that can be used in the struts project.
“Message Resources” definition files can be added to the struts-config.xml file
through <message-resources /> tag. Example:
<message-resources parameter="MessageResources" />
What is an
“Action Class”?
The “Action Class” is part of the “Model” and is a wrapper around the business logic.
The purpose of the “Action Class” is to translate the HttpServletRequest to the business logic.
To use the “Action”, we need to subclass and overwrite the execute() method.
All the database and business processing is done in the “Action” class.
It is advisable to perform all the database related work in the “Action” class.
The ActionServlet (command) passes the parameterized class to ActionForm 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 according to the value of the returned ActionForward object.
The “Action Class” is part of the “Model” and is a wrapper around the business logic.
The purpose of the “Action Class” is to translate the HttpServletRequest to the business logic.
To use the “Action”, we need to subclass and overwrite the execute() method.
All the database and business processing is done in the “Action” class.
It is advisable to perform all the database related work in the “Action” class.
The ActionServlet (command) passes the parameterized class to ActionForm 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 according to the value of the returned ActionForward object.
Write code of
any Action Class?
Here is the code of Action Class that returns the ActionForward object.
package j2eeonline.jdj.com;
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");
}
}
Here is the code of Action Class that returns the ActionForward object.
package j2eeonline.jdj.com;
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");
}
}
What is an “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.
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.
What is
Struts Validator Framework?
The “Struts Framework” provides the functionality to validate the form data.
It can be used to validate the data in the user’s browser as well as on the server side.
Struts Framework checks the JavaScript code and it can be used to validate the form data on the client browser.
Server side validation of form data can be accomplished by subclassing your “form” Bean with DynaValidatorForm class.
The “Validator” framework was developed by David Winterfeldt as a third-party “add-on” to Struts.
Now the Validator framework is part of the “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 any making any additional settings.
The “Struts Framework” provides the functionality to validate the form data.
It can be used to validate the data in the user’s browser as well as on the server side.
Struts Framework checks the JavaScript code and it can be used to validate the form data on the client browser.
Server side validation of form data can be accomplished by subclassing your “form” Bean with DynaValidatorForm class.
The “Validator” framework was developed by David Winterfeldt as a third-party “add-on” to Struts.
Now the Validator framework is part of the “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 any making any additional settings.
Describe the
details of XML files used in the “Validator Framework”?
The Validator Framework uses two XML configuration files
1) validator-rules.xml and
2) 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.
The Validator Framework uses two XML configuration files
1) validator-rules.xml and
2) 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.
How would you display “validation fail”
errors on a JSP page?
Following tag displays all the errors:
<html:errors/>
Following tag displays all the errors:
<html:errors/>
How can one enable front-end validation
based on the xml in validation.xml?
The
<html:javascript>
tag allows front-end validation based on the xml in validation.xml.
For example the code:
generates the client side JavaScript for the form "logonForm" as defined in the validation.xml file.
The <html:javascript> when added in the JSP file generates the client side validation script.
The
<html:javascript>
tag allows front-end validation based on the xml in validation.xml.
For example the code:
generates the client side JavaScript for the form "logonForm" as defined in the validation.xml file.
The <html:javascript> when added in the JSP file generates the client side validation script.
class A extends
ActionSupport{ }class B extends A{}Is B also acts as an action class or not?
Explain
Latest Answer: Yes if all the methods of the action class
defined in Class B then it is sure act as a Action class. ...
Read Answers (1) | Asked by : sekhark
Latest Answer: Forward ActionInclude actionDispatch
ActionLookup Dispatch Action ...
Read Answers (2) | Asked by : har_5047
What are the
advantages and disadvantages of Struts 2 Framework?
Latest Answer: 1. no need coding action forms2. can be any
method3. action name can contain place holders4. interceptors5. value stacks6.
thread safecompared to struts 1 ...
Read Answers (2) | Asked by : snjy85
Why we use
Struts framework in project?
Latest Answer: Struts Framework provides layered architecture which decouples the Model, View and Controller. Hence we can
seperate businees logic from presentation logic. Maintenance is
easy. This is achieved by MVC 2 architecture. Here Only one controller ...
Read Answers (9) | Asked by : jeenjustin
What is
heirarchy of files in Struts?
Latest Answer: When the request is recived by ActionServlet
it looks for the ActionMapping entries in the Struts-config.xml. ActionMapping
returns the appropriate Action class where we handle the business logic.Finally
execute() returns the ActionForward key (View). ...
Read Answers (4) | Asked by : jeenjustin
Latest Answer: We can configure the
database connection by setting the connectino atributes in server.xml file
which is available in conf folder in the tomcat home path. In this server.xml
file there is an tag attributes related make connection pool for any database.
...
Read Answers (4) | Asked by : naggeek
iam not able to
disable a JSP in Mozilla but its working fine in IE7 can any one guide me
sending the code line for this
Latest Answer: get the header of mozila and apply condition
for this perticular condition u can ban the page to display on mozilla ...
Read Answers (1) | Asked by : siva_sandeep
why do we have
only one ActionServlet in Struts?(Asked in Polaris Interview for Java
Experienced people , on April 11, Chennai)
Latest Answer: This is so because struts implements MVC and
in an MVC we generally (almost 99%) have only one controller. The ActionServlet
acts as a controller. ...
Read Answers (7) | Asked by : khadarzone
What is the
difference between Struts 1.x and Struts 2.x
Latest Answer: Feature Struts 1 Struts 2 Action classes
Struts1 extends the abstract base class by its action class. The problem with
struts1 is that it uses the abstract classes rather than interfaces. While in Struts 2, an Action class implements an Action interface,
...
Read Answers (1) | Asked by : siva2baba
What are the helper
file in the form of JSPs available in struts?.Is struts tags are XHTML
supportive?
View Question | Asked by : gotlururaja
Help me
Latest Answer: The only difference between the two
isexecute() throws Expection whereasperform() throws IOException and
ServletExceptionperform() has now been depricated so one should use execute()
only. ...
Read Answers (3) | Asked by : Anupama
Latest Answer: Frame work automatically generate
ActionServlet which is reduce the work of programmer. In traditional
Servlet/JSP project programmer explicitly write Actionservlet ...
Read Answers (3) | Asked by : kiranmaye
Latest Answer: Nothing will happen at that instant. In the
action, if we try to cast the action form and using it, then it will throw
nullpointer exception.Regards,Mahes. ...
Read Answers (3) | Asked by : chandrasekhar.d
Action Class is
Thread safe if i declare method for database connections before the execute
method and when you try to access what will happen for application
Read Answers (1) | Asked by : Sreekanth Konda
Latest Answer: saveToken() method is used for duplicate form
submission.Let's take an example i.e. yahoo email registration formYou filled the form and press the "submit" button
more than once.For each action you do there is a request object associted with
that.So when ...
Read Answers (1) | Asked by : selva
What is
integration logic? How does struts frame work develop integration logic
automatically using deployment descriptor?
View Question | Asked by : venky_mca
Latest Answer: If our Form has single function we have to go
for action class but if our Form has to perform multiple functions then we have
go for dispatch action.In struts config we have to provide
parameter="methodToCall" and in the jsp we have to
...
Read Answers (6) | Asked by : Gangadhar P
Latest Answer: It would be misleading to say that only one
instance of Servlet is created per web application. One instance of each
Servlet class defined in your code is created per web application. i.e., If
your application has 100 ActionServlet classes, you will have ...
Read Answers (2) | Asked by : katipelly
How do you
identify user session has been ended (at a particular time ) and forward a page
to login page automatically
Read Answers (4) | Asked by : vijayganesh mech
Latest Answer: Struts does not bind the programmer till the
DAO layer. You can have anything you like, as the return type (valid in
programming construts, of course) for the DAO method, Struts would not crib
about anything, and would be happy to serve your Action class, ...
Read Answers (3) | Asked by : sanjib
Latest Answer: Actually the confusion is between two classes
Action and ActionServlet. Be clear that these two are different classes.
ActionServlet is a servlet but Action is a normal java class. ...
Read Answers (11) | Asked by : enjoy
Latest Answer: A Forward Action is a standard Action forwards
the request to the context-relative URI(JSP/Servlet) specified by the parameter
property of the associated ActionMapping.To configure the
use of the Forward Action in your struts-config.xml file, create ...
Read Answers (2) | Asked by : kiran.p
Latest Answer: Struts tags bind the property value with the
Formbean property defined. ...
Read Answers (4) | Asked by : raghava_
Latest Answer: 1. HTML tags are static Struts tags are
Dynamic (At the run-time struts tags are called) 2. Another diff is You create
your own Struts tags... ...
Read Answers (1) | Asked by : Struts
What are the
contents of web.xml and struts-config.xml? What is the difference between them?
How to relate these tow xml files?
Read Answers (7) | Asked by : Akila
In struts
servlet control the application and we know that a jsp compiled into a
servlet first. The only problem with the servlet is that it needs to write
out.println call per HTML line. But as a controller
Latest Answer: Satisfied with the above comment. Why we are
using struts, we can use JSP. as we know the advantages of Struts, so we use
it. So we use Servlet that is for writing logic, as a controller. JSP is for
Presentation. ...
Read Answers (2) | Asked by : khalid_it
Latest Answer: We can have more than one Action Servlet but
Struts controller follows the front controller design pattern. As per this pattern we will have only one controller. Designing
more than one action servlet is breaking the rule of design pattern. ...
Read Answers (5) | Asked by : swetha
Latest Answer: REquest diapatcher servlet which filters the
action servlet actions is added in 1.2 ...
Read Answers (2) | Asked by : Srinivas
Should every
html form property have a corresponding formbean get/set and variable.?Can form
property be omitted in a form bean?
Read Answers (5) | Asked by : shobana24
Can input form property be
omitted in a formbean ? is it mandatory for every form property to have a
Can input form
property be omitted in a formbean ? is it mandatory for every form property to
have a corresponding formbean get/set and variable ?
Read Answers (4) | Asked by : Shobana
If any one knows
the answer plz add..
Latest Answer: in order to access the resources
Read Answers (4) | Asked by : Rafi
Latest Answer: Hi,Struts Extras provides several popular but
non-essential classes, including: ActionDispatcher An Action helper class that
dispatches to a public method in an Action. BaseAction BaseAction is
provided as an intermediate class for shared funtionality ...
Read Answers (2) | Asked by : Sujatha
Latest Answer: Hi,If I have understood your question
properly. You want to map two forms with one action class..It can be done
but its not really good idea to do by means of design if they are not from same
inheritance.Form Hierachy, Like, User -> Customer ...
Read Answers (4) | Asked by : mytramesh
Latest Answer: Use the Service Locator pattern to look up the
ejbs Or you can use InitialContext and get the home interface ...
Read Answers (3) | Asked by : prasad
Latest Answer: In Struts1.0 have perform() methos in action
class where as struts 1.1 have excute() method in action classAcction messages
() are introduced in struts1.1DynaactionForms are introduce in struts1.1 ...
Read Answers (6) | Asked by : sadashivarao
Latest Answer: Difference in output.ex: if we forward from
one.jsp to two.jsp the contents of only two.jsp will be generated . if we include two.jsp in one.jsp the contents
of both the jsp's will be generated ...
Read Answers (3) | Asked by : Rajeshwar
Latest Answer: Yes, we can have more than one
struts-config.xml file in a web application.Each
struts-config.xml file for different modules in our application.Declaration in
web.xml is:config/pullman/WEB-INF/calculator/struts-pullman-config.xml ...
Read Answers (10) | Asked by : Suresh.M
Latest Answer: MVC is generlised architecture.
There is no MVC1 and MVC2. According to Sun Microsystems in MVC Model1 driven
architecture Controller and view is JSP and model is bean. In MVC model2 driven
architecture we will use Servlet as controller, ...
Read Answers (5) | Asked by : bhupathi
Latest Answer: Hi,According to my knowledge,If the same
condition is mapped to the same jsp page in multiple actions we use global
variable i.e to avoid repititon. ...
Read Answers (1) | Asked by : Raj
Latest Answer: Container doesn't know about any thing. what ever is configured in application's web.xml it will take it as a configuration. We can configure our own MVC implmentation and front controller in application
configuration (i.e. web.xml) instead of ActionServlet. ...
Read Answers (7) | Asked by : purandhar
Latest Answer: Few Disadvantage are mentioned in the below
link. Struts have disadvantages mainly on performance of the application.
Especially when using advanced tag like nested-loop etc, Resulting in creating
many Forms object then required.http://www.coreservlets.com/Apache-Struts-Tutorial/Understanding-Struts.html
...
Read Answers (1) | Asked by : sadashivarao
Please anybody
send the abbreviation of struts? this is the question i have faced in the
interview?
Read Answers (7) | Asked by : rajesh
Latest Answer: 1. A request comes in with a .do extension,
the container maps it to the ActionServlet. 2. The ActionServlet acts like a
front end controller and dispatches control to a RequestProcessor. 3. The
RequestProcessor finds an action tag with a path attribute ...
Read Answers (7) | Asked by : kalpana
Latest Answer: Â hiwhen ever start the web application
the web container creates AcctionServlet object by using load-on-startup
method. then it gets the config init parameter. then read the config-xml
file.cheerssiva ...
Read Answers (3) | Asked by : Deven
Latest Answer: Differences between Struts 1.1 and 1.2
:-1) Adviced for replacement of ActionErrors with
ActionMessages2) org.apache.struts.Action statics: Use
org.apache.struts.Global statics instead3) Many utility methods previously
found in org.apache.struts.utils.RequestUtils ...
Read Answers (3) | Asked by : shital_patil
Latest Answer: bean:message retrieves an internationalized
message for the specified locale, using the specified message key, and write it
to the output stream. Up to five parametric replacements (such as
"{0}") may be specified.The message key may be specified ...
Read Answers (4) | Asked by : pavani
Latest Answer: Hi Folks,Ordinary Servlets:These are extends
HttpServlet, and service the req, and send the response to the client. At the
time, servicing, the container will create the objects for this servlets, when
ever, it needs.ActionServlet:This also extends HttpServlet. ...
Read Answers (3) | Asked by : sadashivarao
Latest Answer: in struts 2.o we have a new cancel
functionality by which on pressing cancel we can go to a differen action. ...
Read Answers (2) | Asked by : Sridevi
Latest Answer: the exadel studio is one of the plug-in for
struts ...
Read Answers (3) | Asked by : Satheesh Jayabalan
Latest Answer: in struts 1.0 we have to override perform
method from 1.1 onwords execute method was introduced.this supports us to throw
any exception,i.e,thia provides declarative exception handling. ...
Read Answers (7) | Asked by : sadashivarao
ActionForm class
is used to capture user-input data from an HTML form and transfer it to the
Action Class. ActionForm plays the role of Transport Vehicle between the presentation Tire & Business Tier.Life
Latest Answer: An ActionForm is a java bean that extends
org.apache.struts.action.ActionForm, ActionForm maintain the session state of
web application.All data submitted by the user are sent
corresponding ActionForm ...
Read Answers (1) | Asked by : Kamal Lochan Patra, UBIQUE
LookupDispatchAction
is like DispatchAction but LookupDispatchAction uses the value of the request
parameter to perform a reverse lookup (using protected Map getKeyMethodMap() )
from the resource bundle
Latest Answer: LookupDispatchAction is subclass of DispatchAction
which actually lookup the action class method name using the request parameter
value in the reverse process by looking the value in the resource bundle.i.e
using map method :save.checkorder=button.checkorderin ...
Read Answers (1) | Asked by : Kamal Lochan
In struts how
can i validate the values filled into the text boxes or else using
DynaValidatorForm,without using javascript.Actually with javascript it is
working perfect but not without javascript, and i want without javascript?
Read Answers (6) | Asked by : Raghvendra Dwivedi
Latest Answer: jsp1.Struts framework is basically using the
taglib so we can import taglib, it is possible for jsp elements.Directive
tag
Read Answers (4) | Asked by : sadashivarao
Latest Answer: Offcourse you can make changes to actionservlet by extending it and override the particular method
or funcationality which is not meeting your problem requirements.Check with
RequestProcess interface and see by having you own request process class
implementation ...
Read Answers (2) | Asked by : sadashivarao
In struts, if
any changes are made to before the request reaches to actionservlet, where you
do the changes?
Read Answers (3) | Asked by : sadashivarao
Latest Answer: JSPs are more towards the J2EE line. In a
large jsp applications, lot of java script , css(cascaded sytle sheet) , lot of
more thing are applied, with the actual information. Information is required
but the presentation of information is also important. ...
Read Answers (2) | Asked by : sadashivarao
Latest Answer: IN addition to whatever said in comment one,
in Jakarta Struts request processor has most of the following responsibilities:
1. Determine path, 2. Handle Locale, 3. Process content and encoding type,
4.Process cache headers 5. Pre Processing hook
6.Pre-processing ...
Read Answers (2) | Asked by : sadashivarao
Latest Answer: Since the very purpose of having a controller
in the struts framework is to redirect the request to the appropriate action
class to process the correspnding business logic, and servlet is the
gateway to the web-container for each http request. ...
Read Answers (2) | Asked by : sadashivarao
Latest Answer: hithe action mapping object to give the proper action to that
partcular request and takes care of validation
also. ...
Read Answers (2) | Asked by : K.Harikumar Reddy
Latest Answer: As the ActionMessages represent the error
scenarios for the current request, they must be stored in request scope not in
session scope. hence no way of thinking of removing action messages from
session scope.Mahes ...
Read Answers (3) | Asked by : prasad
What is the
correct syntax for removing ActionMessages from the session context? Choice 1
Action.removeErrors(); Choice 2 ActionMessages msg1 = new
ActionMessages("clear"); Action.saveErrors(session, msg1); Choice 3
Action.saveErrors(session, null); Choice 4 Action.clearErrors(session, null);
Choice 5 request.getSession().saveErrors(session, null);
Read Answers (1) | Asked by : N
Question:
Assuming the class LoginForm contains a String property named
"password", how does the LoginAction class access the attribute
called "password" in the above request? Explain why.Choice 1 String
password = request.getParameter("password"); Choice 2 String password
= request.getAttribute("password"); Choice 3
request.getParameterNames().getParameter("password"); Choice 4 String
password = ((LoginForm)
Read Answers (6) | Asked by : N
Why is the
action class is singleton in nature? Isn't this creates a bottleneck for the
requests?
Read Answers (3) | Asked by : Sharan
Latest Answer: both are same ...
Read Answers (13) | Asked by : bangaram
Latest Answer: Yes.We can make Action class, DAO class
without form class. In this case, we can get the form elements by using
HttpServletRequest.getParameter("elementName");Mahes ...
Read Answers (6) | Asked by : Vaibhav jethi
Latest Answer: both are same ...
Read Answers (4) | Asked by : avneesh1983
Ans: No , when
we go one page to other page then we using both , but no togetherotherwise
browser incompatible problem arise.
Latest Answer: Yes. We can achieve this either using
JavaScript or action mapping. If you use JavaScript, we can use the 'location.href' to go one page to other page.If you use action mapping, we
can use the findForward method to go one page to other page. ...
Read Answers (3) | Asked by : avneesh1983
Tags : Java Script Function
Is there any way
to define a default method for every in the action mapping of Struts-Config.XML
file? If yes then how? Give a piece of code demonstrating the same.
Read Answers (6) | Asked by : Soumen Trivedi
Latest Answer: in action mapping we specify action class for particular url ie path
and diffrent target view ie forwards on to which request response will be
forwarded. We also specify to which page control should go if there is
validation error for ex input property ...
Read Answers (3) | Asked by : CHANDRA SEKHAR JONNALAGADDA
Latest Answer: Object is the super class for Action and
ActionForm as there are no immediate super classes . ...
Read Answers (8) | Asked by : nagendra
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