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Is struts thread safe?
lwpro2
- Oct 1st, 2010
Struts is a framework, wrap around servlet. As servlet is not thread safe, struts actions is not either. For struts 1, it's not thread safe. For struts 2 if integrate with spring, not thread safe. for...
kranthi kumar
- Apr 20th, 2006
As struts is a collection of clasess and interfaces u can't make whole framework as a singlethread.if u can make individual components jsp(view) and servlet(controller) as threadsafe.
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What is the difference between ActionForm and DynaActionForm
devabscmca
- Oct 7th, 2010
ActionForm is static form bean and DynaActionForm is dynamic formbean. If we want to use DynaActionForm no need write formbean we need to write all the jsp fields in Sturts-config.xml?
raj.ntrj
- Nov 11th, 2008
In ActionForm we have to provide setters() and getters(),if we want to add more properties we have to provide to provide that much of setters() and getters().Apace people found that there is a burden ...
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Explain Struts navigation flow
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Editorial / Best Answer
ravi_1229- Member Since Nov-2006 | May 9th, 2009
1) When first the request is made from a JSP/HTML/XSLT to the server with a particular URI(/something.do), the controll first reaches Web.xml file.
2) it checks the mapping for /something.do in web.xml and finds the ActionServlet and loads ActionServlet.
......
<servlet-name>action</servlet-name>
<servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
.....
<servlet-mapping>
<servlet-name>action</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>
3) As part of loading ActionServlet calls the init() as every other servlet does.
(Note: ActionServlet extends HttpServlet only)
......................
<init-param>
<param-name>config</param-name>
<param-value>/WEB-INF/struts-config.xml</param-value>
</init-param>
........................
4) in init() it takes the init-parameters as struts-config.xml and loads the xml file.
5) then the ActionServlet calls the proceed() of RequestProcessor class.
6) in proceed() , it checks the appropriate mapping for current request, creates and ActionMapping object and maps the URI to the action in the struts-config.xml.
7) then it creates an object to ActionForm associated to that action mapped object
8) calls the setters and reset().
9) if the action tag in struts-config.xml contains validate="true", then the validate method is called.
10) if any validation errors, it return to view component (any jsp,XSLT) which is specified as an attribute of input="/error.jsp"
11) if there are not validation errors, it then creates an Action class for that mapping and search for execute method and executes it.
12) execute method performs the bussinesslogic which you provide and returns with an ActionForward key.
13) now the returned key is searched in the mapping object which is specified as forward tag.
14) it looks for the appropriate view component and performs the getters on that view component and returns the response to the browser.
Simple, Thats it.
Thanks
Ravi
Prabhakar122
- Oct 31st, 2010
Struts navigation flow================1) When application server gets started,container loads the web.xml1) When first request is made from a JSP/HTML/XSLT to the server with a particular URI(/somethi...
devabscmca
- Oct 7th, 2010
Struts flow After developing the struts application after deploying it is the server & when you started the server then following things will happened Container initializes the web.xml When co...
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What is the difference betwwen struts 1.1 and struts 1.2?
Prabhakar122
- Nov 3rd, 2010
Struts 1.2 features:==============1) In Struts 1.2,ActionErrors were deprecated, needs to use ActionMessages instead of ActionErrors.2) Introducing to MappingDispatchAction (A new standard actio...
Venu
- Feb 16th, 2007
REquest diapatcher servlet which filters the action servlet actions is added in 1.2
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What is the difference between Struts 1.0 and Struts 1.1
Prabhakar122
- Nov 3rd, 2010
Struts 1.1 new features are:====================1) Method perform() replaced by execute() in Struts base Action Class2) Declarative exception handling3) Dynamic ActionForms4) The Struts Validator5) De...
raj.ntrj
- Nov 11th, 2008
The new features added to Struts 1.1 are 1. RequestProcessor class 2. Method perform() replaced by execute() in Struts base Action Class3. Changes to web.xml and struts-config.xml4.Declarative excepti...
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What is struts flow? Explain in detail
Prabhakar122
- Nov 4th, 2010
Struts Flow======== 1) When application server gets started,container loads the web.xml2) When first the request is made from a JSP/HTML/XSLT to the server with a particular URI(/something....
kanna_sp2000
- Oct 4th, 2010
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 Reque...
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Insert and Retrieve Images
How to insert and retrieve images in STRUTS through MySQL database and how to get path of image (or file) from local system?
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What is integration logic? How does struts frame work develop integration logic automatically using deployment descriptor?
sowdri
- Jan 30th, 2011
<servlet> <servlet-name>action</servlet-name> <servlet-class>org.sagarius.databox.ActionServlet</servlet-class> <init-param> <param-name>config</para...
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Sub Class of Action Class
class A extends ActionSupport{ }class B extends A{}Is B also acts as an action class or not? Explain
vinaymudgil007
- Feb 3rd, 2011
Yes, it will be an action class and in my opinion I would say its an action class even if it doesn't override any method. This goes with the rule of inheritence.Thanks,Vinay
vkankane
- Sep 5th, 2010
Yes if all the methods of the action class defined in Class B then it is sure act as a Action class.
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Is there any way to put my custom name to LIB folder which i am going to place in WEB-INF folder of struts application?
Please answer this question
vinaymudgil007
- Feb 7th, 2011
I don't know if its possible [if anyone knows please share how its possible].But may I know why this is required?
geeksterrahul
- Aug 3rd, 2009
The possibility is "YES" when you can change the Server configuration.But no one wants to change the server configuration(will cause more problems).So the answer is: Although it's possible it's not recommended that you change the server configuration.
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Can we use any other technology than JSP to construct a view ?
Yes, other than JSP we can use Swing, JSF, Cocoon etc as a front end for our struts application. Here is a link to the article for using struts with swing as front end
vinaymudgil007
- Feb 7th, 2011
I think that flex is quiet popular these days apart of JSF, swings, velocity which can be used.Thanks,Vinay
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What r the disadvantages of struts?
vinaymudgil007
- Feb 7th, 2011
Personally I have used struts for quiet a long time and the limitations mentioned on the link uin the above post, I haven't encountered any of them, So my experience says that its a very nice framework to work upon.Thanks,Vinay
Vijay
- Aug 14th, 2006
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 man...
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How can we work struts on Eclipse? What is the best plugin for this?
vinaymudgil007
- Feb 7th, 2011
As mentioned above by someone in these posts that "excadel" is one populer plug-in for using it with eclipse.And well if you are not rigid with using it with Eclipse only, I would suggest you to use it with NetBeans [say 6.9.1] and I am sure you would like it.Thanks,Vinay
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In struts why we use servlet as action controller?
vinaymudgil007
- Feb 7th, 2011
We do this in order to reap benefits of MVC [mvc-2] pattern.And BTW, this question isn't specific to struts I believe.Thanks,Vinay
Ajit
- Apr 4th, 2007
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 th...
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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.
vinaymudgil007
- Feb 7th, 2011
Overriding org.apache.struts.action.RequestProcessor is another solution I would suggest.Thanks,Vinay
krishnachaitanya.v
- Jul 8th, 2008
use unknown = true tag in action tag of struts-config.xml.With this, the action mapping will be defaulted if no matching path is found.Eg:<action-mappings><action path="/example&quo...
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What will happen if the mapping to actionform in the struts-config.xml is mentioned wrong?
vinaymudgil007
- Feb 7th, 2011
Its pretty trivial that their will be a http status 500 error stating that the requested resource wasn't found.The reason is:--Its the job of the ActionServlet to create the actionform instance fo...
rammaheswara
- Dec 22nd, 2008
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.
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What is the diff between perform() and execute() method?
vinaymudgil007
- Feb 7th, 2011
The new method execte() is necessary because perform() method declares that it throws only IOException and ServletException. Due to the added declarative exception-handling functionality the framework...
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In struts, if any changes are made to before the request reaches to actionservlet, where you do the changes?
vinaymudgil007
- Feb 7th, 2011
I think what you are looking for from this query is that you want some of your custom [application speicifc code to be in place before you processes a request], then it can be achieved in following tw...
Shipra Dey
- Nov 18th, 2006
I suppose ... We can do it by making a new class which will extend the RequestProcessor or TilesRequestProcessor whicever is mentioned in config file tag and give the path.I hope this will do
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In struts why we use jsp as presentation layer? can we use servlet as presentation layer?
vinaymudgil007
- Feb 7th, 2011
Well if you don't want to follow MVC [mvc-2], struts [or anyone] doesn't stop you from doing that.If you don't do it, then you will loose the benifits that come along with the mvc architecture.Thanks,Vinay
U.Vellaisamy
- May 21st, 2006
jsp1.Struts framework is basically using the taglib so we can import taglib, it is possible for jsp elements.Directive tag<%@ taglib uri="WEB-INF/struts-bean.tld" prefix="bean.tld"%><%@ ...
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type="com.test.LoginForm"/>
path="/login"
type="com.test.user.login.LoginAction"
name="loginForm"
validate="false">
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) form).getPassword();
Choice 5
String password = form.getPassword();
">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) form).getPassword(); Choice 5 String password = form.getPassword();
vinaymudgil007
- Feb 7th, 2011
Choice 4
String password = ((LoginForm) form).getPassword();
is the appropriate answer wrt struts framework.
Thanks,
Vinay
prasad.juturi
- Aug 24th, 2009
If the values are set from a JSP, then we need to follow the request.getAttribute() method and while revalidating the fileds, the request.getParameter() method?will be fired.The reason for the above t...
Struts Interview Questions
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