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Explain about Inter-Servlet communication and business reason for using Inter-Servlet communication
akantilal
- Jun 12th, 2007
Inter-servlet communication can happen in the following ways:1. By storing & retrieving data from shared scopes like session and application(servlet context).2. By using forwards & redirects.M...
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Can you pass object references in Non-distributed Technologies?
akantilal
- Jun 12th, 2007
Yes. Non-distributed technologies would mean objects in a single JVM. Within a single JVM, objects are always passed by reference.When it comes to distributed, which means 2 JVMs running either on the...
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What is the difference between Single Thread Model and Multi Thread Model?In which situation we use the Single Threaded Model?
akantilal
- Jun 12th, 2007
The single thread model means that your servlet would not be multi-threaded. If there are two concurrent requests to your servlet, then 2 instances of your servlet will be created to process these 2 r...
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How to find out the servlet is demon thread
akantilal
- Jun 12th, 2007
You can use the following code to determine whether the thread in which your code is getting executed is daemon or not.if(Thread.currentThread().isDaemon()) { //logic to execute if daemon.} else { //logic to execute if not daemon.}
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What is the importance of deployment descriptor in servlet?
Amit Saini
- Dec 15th, 2006
Deployment descriptor is use to configure the web application ,its provide the servlet mapping to the URL?mailnly it?s a web.xml file ?.rightAmit saini
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Can we call destroy() method on servlets from service method?
">Can we call destroy() method on servlets from service method?
destroy() is a servlet life-cycle method called by servlet container to kill the instance of the servlet. The answer to your question is "Yes". You can call destroy() from within the service(). It will do whatever logic you have in destroy() (cleanup, remove attributes, etc.) but it won't "unload" the servlet instance itself. That can only be done by the container
rameshvdnv
- Apr 25th, 2007
Yes,we can call destroy method,but it is not recommended to call this method from our code since init(),service(),destroy()'s r servlet lifecycle methods.And in destroy()there will be aconfig vari...
hariprasad
- Apr 22nd, 2006
Destroy
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When a servlet accepts a call from a client, it receives two objects. What are they?
ServeltRequest: which encapsulates the communication from the client to the server.ServletResponse: which encapsulates the communication from the servlet back to the client.ServletRequest and ServletResponse are interfaces defined by the javax.servlet package.
rameshvdnv
- Apr 25th, 2007
when a request is sent from the browser to a servlet, the servlet object will be created by the webcontainer if we don't provide load-on-startup element.suppose if we provide load-on-startup eleme...
Gunna
- Aug 10th, 2006
The Servlet then receives "ServletResponse" and "ServletRequest" objects.
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Which method is more advantageous doGET() or doPOST()? in which situation does we use doGET() then?
mahesh
- Apr 25th, 2007
DoGET() is better
Veeren76
- Aug 17th, 2006
Practical Example of doGet()there is online newspaper and you see news using url something similar to this http://mynewspaper.com/articles/showarticle.jsp?artId=12345this is good use of doGet(), since...
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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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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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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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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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What is the difference between requestDispatcher and namedDispatcher?
nil.choudhary
- Feb 17th, 2007
What I found is there is nothing called namedDispatcher. But there is a method called getNamedDispatcher() in servletcontext which is similar to getRequestDispatcher(). &n...
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Can we put costructor in place of init() method . if yes how it works plz xplain in detail??
praveen.sakhamudi
- Feb 12th, 2007
Webcontainer create an object for servlet class.for createing an object use the newInstance() method.this object automaticaly create a defaultconstructor so we can not create parametarised constructior for this object.praveen kumar sakhamudi
sunil.yadav
- Jan 31st, 2007
Constructor makes a simple object, when the container call init() on this simple object, now the simple object has become servlet which can serve the request.
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