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When to use session scope1?How session object is managed by the webcontainer?When the session object is created and when it is removed?
sudhakarchowdary
- Jan 12th, 2007
when the servlets has to use any java object that is specific to the client for processing muiltiple requests then we must store the java object in session object.session objects are ...
sureshkumar
- Nov 8th, 2006
hiSession is a unique object created by the server to the client.Session can be identified by using a session id.When the data is specific to a client at that time we need to store the data in session...
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How many hits can Apache tomcat take at a time i.e How many requests it accept at a time.
Ganesh
- Nov 27th, 2006
50 hits it can handle at a time
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How to call the resource that is available in another web server by using response.sendRedirect()?
amit_9b
- May 2nd, 2009
Using this method is pretty straight-forward. BUt there is a simple catch: No data should be committed to the servlet output stream before the redirection occurs.In case data has been committed and th...
akantilal
- Jun 12th, 2007
You can very much use the same response.sendRedirect method to redirect to a resource on another web server. You can provide the absolute URL along with the protocol name like response.sendRedirect(http://www.google.com);
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What is difference between Redirect and request dispatch
Praveen.kb
- Sep 4th, 2009
Request Dispatcher - Dispatch the request to some other JSP or Servlet, user will not aware of this and finally response will go from where the request is dispatched.Request Redirect - Redir...
prasad_posina
- Sep 21st, 2007
Using the redirect method ,we can forward the request to servlet that is either in the same servlet container or in other container .When we are using request dispatch method ,we can forward the request only to a servlet that is in the current container.
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Describe Servlet Class Hierarchy.
Class java.lang.Object
rajesh
- Sep 26th, 2007
javax.servlet.servlet ->interface &...
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Servlets Questions
1)What is web.xml?2)what is the filter?3)How to we create a new JSTL class?4)When we are developing the project which collections mostly used?5)Difference between reqeust.getAttribute,and request.getParameter?
rizwan.amd
- Sep 1st, 2010
1) What is web.xml? As this is a deployment descriptor, this is mandatory for an web application to deploy in web/application server. It contains servlets name, url pattern, load on startup, if ...
fcasttro
- Nov 21st, 2007
1)What is web.xml?web.xml is nothing but a deployment descriptor. It describes a web applicants deployment settings.2)what is the filter?It is an Pluggable web componenet device it allow us to impleme...
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Can I invoke a JSP error page from a servlet?
Yes, you can invoke the JSP error page and pass the exception object to it from within a servlet. The trick is to create a request dispatcher for the JSP error page, and pass the exception object as a javax.servlet.jsp.jspException request attribute. However, note that you can do this from only within controller servlets.If your servlet opens an OutputStream or PrintWriter, the JSP engine will throw...
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What is the servlet life cycle?
Each servlet has the same life cycle:A server loads and initializes the servlet (init())The servlet handles zero or more client requests (service())The server removes the servlet (destroy()) (some servers do this step only when they shut down)
Sonikanth
- Feb 22nd, 2010
Servlet Life cycle contains public void init(ServletConfig cg)public void service(HttpServletRequest req, HttpServletResponse res)public void destroy()init() with zero arguments is the helper method for init(-) with one parameter.
Santosh Kumar
- Oct 13th, 2005
Servlet life cycle defines the life process of the servlet. It has certain methods that comes into existence throughout the utilization of the servlet. Generally newInstance() method creates an object...
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What is servlet context and what it takes actually as parameters?
">What is servlet context and what it takes actually as parameters?
jimmy514in
- Jul 3rd, 2010
You cannot set the attribute of the servletcontext,You can only call the getAttribute() of the servletContext object.The attribute of the servletContext can be set in the web.xml file using <c...
Aparna
- May 5th, 2006
Sumit Sengar Wrote: Another very important and practical application of ServletContext that i have come across is that it can be used to hold the object which can generate request independent and non-...
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What is the difference between ServetConfig and ServletContext..?
surikvs332
- Jun 22nd, 2010
ServletConfig: This is mainly to get the configuration parameters int your serlet. With this we can get the configuaration data which we menstioned in the web.xml file.ServletContext: This is fo...
gokulakrishnan
- Sep 28th, 2005
SevletConfig is used to give the information during the initializing period.ServletContext is used for thye communication between the servlet and the servletcontainer thatis to give MIME ty...
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After converting jsp into servlet which methods are present i.e all 6 methods(jspinit(),_jspService(),jspDestroy(),init(),service(),destroy()) or only 3 methods i.e either jsp life cycle methods or servlet lifecycle methods
kotichallenges
- Jun 7th, 2010
We can see _jspInit(), _jspService(), _jspDestroy() available after deploying the JSP file.
Vandana
- Aug 22nd, 2006
A jsp is basically a servlet so, there would be three methods not 6. jspInit() and jspDestroy() mehtods would be visible only if you override them in jsp page<%!public void jspInit() {//initialization code}public void jspInit() {//destroy code}%>_jspService() mehtod is always visible.
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How many ServletConfig and servlet context objects are present in one application?
Debasish Dutta Roy
- Jan 16th, 2006
The answers above are not fully correct. The correct answer is1. There is a servlet config per servlet in an application. (Almost, all got this right)2. There is one ServletContext, per application and per jvm. Per jvm is the missing piece. Its about the same app running in multiple jvms
javamatrix
- Nov 9th, 2005
i wud like to clarify shyamalatha point.....there is only one servlet context for an entire application where as for every servlet, there is a servlet config object....Using the servlet context, a ser...
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How much amount of information will be stored within a session
Dhananjay
- Dec 13th, 2006
In session you can store data of server RAM size, ofcourse it is available RAM size, lets say RAM is 128 MB and on booting the system say 28 MB is used By Operating System or other services, then u can store up to 100 mb of data in sessionCheers
bhanamant
- Dec 9th, 2005
we can stored large amount of date with session(i.e. no limitation for storing data). but limitation of session id will be limited to 4k.regards,ganesan r.
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Consider a scenario where 2 instances of an appserver are running in a machine. And one application has been deployed in the two servers. Does these two applications deployed in two servers use the same JVM or different?
jimmy514in
- Jul 4th, 2010
Okay, so i have a question , if the 2 web applications are on the same server, Do they run on the the same JVM...but they have their own Servletcontext and their own runtime enviornment..?Just like a sand box?..Please clarify this point.Thanks!
Neeraj
- Aug 19th, 2006
If there are are two AppServer in a physical box, they must have their own JVM. So even if same application deployed on these appServer it will be on different JVM.
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What is differents between forword(),include() and sendRedirect()? In which circumtances all are used? Give Proper Examles.
deepak2145
- Nov 15th, 2007
Akshayjsp include directive is used to take the response from the called html/jsp page whereas the jsp inlude action includes the contents of the called servlet/jsp .
Anil kumar
- Sep 16th, 2006
include() : This method is used to include another page into the current page, so the response is generated at the current page.forward() : This method is used to forward the resp...
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What is the role of synchronization when we making a servlet as singlethreadmodel?
krishna Ballabh
- Mar 22nd, 2007
SingleThreadModel technique works well for low volume sites, it does not scale well.All requests that will come for the SingleThreadModel resource would be available only for one user at a time.
Jagdish111
- Mar 21st, 2007
in singleThreadModel Web Container is going to create a number of servlet objects, each object can be accessed by only one thread at a time, if the number of clients are more then there will be two po...
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How Servlet Applet communication achieved?
jimmy514in
- Jul 3rd, 2010
Create a URL. Retrieve the URLConnection object. Set output capability on the URLConnection. Open a connection to the resource. Get an output stream from the connection. Write to the output stream. Close the output stream.
Shaik
- Oct 20th, 2007
Servlet - Applet communication can be achieved in the following way.a) Type the following code in your applet. //The path of the servlet needs to be passed as input param to URL C...
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What is default capacity of connection pool objects in pool of app-server Weblogic and Tomcat webserver?
prathyusha_dasari
- Feb 18th, 2008
The default capacity of connection pool in app-server weblogic is 20.We can redefine the default value if we want.
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