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Is Servlets thread-safe?
Service() method of servlet class is not synchronize then how will it work as thread-safe for every request at the same time?
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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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Can I just abort processing a JSP?
Yes. Because your JSP is just a servlet method, you can just put (whereever necessary) a < % return; % >
goozy
- Jan 15th, 2008
I can see, the jsp:forward line did dissapear after your editing.....It should read: If you want a solution similar to the Coldfusion <CFEXIT>, then do the following: Create a page called exit....
goozy
- Jan 15th, 2008
If you want a solution similar to the Coldfusion , then do the following:Create a page called exit.jsp etc. with only this content:Then EXIT your page this way:This works great within dynamically included JSP-pages and outputs the content processed this far.
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What information that the ServletResponse interface gives the servlet methods for replying to the client?
It Allows the servlet to set the content length and MIME type of the reply. Provides an output stream, ServletOutputStream and a Writer through which the servlet can send the reply data.
chinnu
- Nov 25th, 2006
Methods:response.setContentType();//for setting the content in servletresponse.send Redirect();//for communicating the servletresponse.setHeader("Pragama/","nocahe");//controlling cahe
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What is the difference between mvc and mvc2 architecture?
I m confuse.
sampra
- Mar 4th, 2008
In the mvc 1 all the view model and presention were keept at only one place but in mvc 2all thse thingshas putted together
akantilal
- Jun 12th, 2007
MVC1 architecture is the one where the controller & view logic are combined in a single unit and the model is a separate unit. This was the case with early JSP based applications where JSP would i...
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What is the difference between URL and URI?
movie_22
- May 21st, 2010
URL->gives the complete path, including servername, host,path and target resourceURI-> only name of the target resource
atulkumar81
- Apr 23rd, 2007
URL-Uniform Resource Locator & URI-Unifrom Resource Identifier.
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Which part of the webserver is responsible for initialization of the servlets?
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How to get one Servlet's Context Information in another Servlet?
Access or load the Servlet from the Servlet Context and access the Context Information
Suresh Yerra
- Dec 11th, 2011
We can get the Servlet Context informaiton by using getNamedDispatcher() method in ServletContext.
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Servlets Interview Questions
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