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Why and when do we use connection pool management system instead of database?
dhruv_saksena
- Mar 15th, 2008
Connection Pooling is like u have created a set of connection pools and hav stored them in some data structure.The benefit which u get by doing this is everytime u get a new request u can use one of t...
sampra
- Feb 19th, 2008
There is so many reason why we are using connection pooling rather than database beacuse if we need more connection then container can create more connection and if connections are not in use then container can destroy the conncection. Mainly we are taking connection to connect the database..
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What is the difference between servlet and servlet container?
dhruv_saksena
- Mar 15th, 2008
A Servlet is that portion of your J2EE application which handles ur requets and where the buisness logic is implemented and depending on the request a response object is generated which is sent back t...
sampra
- Mar 4th, 2008
Servlet is sever side of the Java pgm. That is executed by the servlet container.this is ok
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Difference Between Web Container and Web Server
What is the Difference Between Web Container and Web Server?(Asked in Polaris Interview , held on April 11, Chennai)
smartguy
- Apr 15th, 2008
The Webserver: Just Receive the request from the client and forward to Webcontainer, and do the Response vice versa.Web Container: Creates HTTP Request and Response for the Servlet, calls the appropri...
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How can a servlet automatically updated by its data without refreshing?take one example of one sensex site. the corresponding data are shown in a scrolling manner. how they can automatically be refreshed after some time. without refreshing the page.
sivaraj.dak
- May 26th, 2008
<% response.setHeader("refresh","6;URL=http://google.com");%> 6-> after amount seconds the page refresh
angelina
- Apr 11th, 2007
we can also use either of following in <head> tag of html/jsp.<META HTTP-EQUIV="PRAGMA" CONTENT="NO-CACHE"> or <% response.setHeader("Cache-Con...
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What are the necessary conditions to override the init() in servlets?
For overriding init()method any rules are there
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JSP server process
Explain the server process how will server identifies that and response to corresponding servlet and how it sends to that response to correct user ?
urambu123
- Aug 13th, 2008
After we request for a jsp. There is a servlet called pagecompilor , which first parses the .jsp page to .java page.then compiles that .java page and produces .class page.EX.if we have mypage.jsp firs...
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Why SingleThread model is deprecated in Servlets?
mrkrishankumar
- Aug 29th, 2008
The use of the SingleThreadModel interface guarantees that only one thread at a time will execute in a given servlet instances service method. It is important to note that this guarantee only appli...
sampra
- Mar 6th, 2008
Single thread model is depricated beacuse it is really very expensive to creating ins instance for each request is time consuming and difficult
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What is the difference between request.forward and requestdispatcher.forward?
muktasharad
- Sep 3rd, 2008
The question should be like - What is the difference between requestdispatcher.forward and response.sendredirect? The response will not be sent back to the client and so the client will not know...
sunil.yadav
- Jan 31st, 2007
The question should be -- What is the difference between response.sendRedirect(url) and RequestDispatcher.forward(url)?
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Why servlet used as controller in mvc2?plz explain details
prateeks88
- Nov 4th, 2008
According to MVC2 the purpose of addition of the controller was to just separate the dynamic part of the application from the static part and for that the dynamic part given the name "view" is handle...
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What are the differences between GET and POST service methods?
A GET request is a request to get a resource from the server. Choosing GET as the "method" will append all of the data to the URL and it will show up in the URL bar of your browser. The amount of information you can send back using a GET is restricted as URLs can only be 1024 characters. A POST request is a request to post (to send) form data to a resource on the server. A POST on the other hand will...
maneesh.ce.2007
- Jan 17th, 2009
1) Get is Faster than Post..2) Get Is Idempotent i.e same work can be done again and again without harming database...3) Amount of data send is limited to few characters only and are visible in address bar, so sensitive data cannot be sent via GET.
Rudra_java
- Jan 16th, 2009
In case of GET(): data will be append to the URL of the browser if there is any sensitive date it will be view easily. we can't sent data properly, if there is more amount of data. It is faster than...
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Can a init(ServletConfig config) method be overrided in servlets?
vperi
- Mar 19th, 2009
Yes. We can override.The init(ServletConfig) method is defined in the Servlet interface. It has been implemented by the GenericServlet class. The implementation of this init method in the GenericS...
Bhupender Giri
- Nov 9th, 2005
The init() method of servlet can be overridden. Remember the init() method is overloaded in the GenericServlet class. But the difference lies in which init method are u calling..if you override the in...
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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 Custom Servlet?
jyoti.bhandari
- May 14th, 2009
Custom Servlet is user defined servlet which extends HttpServlet class.
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What is difference between HttpServlet and GenericServlet. and when to use and why. what is the importance of each.
aishwarya.srivastava
- Jun 26th, 2009
HttpServlet class is extended from GenericServlet, which in turn implements the Servlet interface. When you are developing your own servlets, you will likely extends one of these two classes.When exte...
A.Naresh Kumar Reddy
- Jan 6th, 2007
HttpServlet Provides an abstract class to besubclassed to create an HTTP servlet suitable for a Web site. A subclass of HttpServletmust override at least one method, usually one of these:doGet, if th...
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What is the purpose of hidden fields, cookies and session objects?
myogeshchavan97
- Jul 26th, 2009
To send data from one web page to another without being shown to the user hidden fields are used.Http Protocol is a stateless protocol hence it does not remember previous request and the variables and...
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In MVC1 architecture there is no controller concept then why it is called as MVC architecture?
Aarasu
- Aug 5th, 2009
There is a controller in MVC1 architecture.Controller in MVC1 architecture is implemented in jsp along with view of the page.But the problem is there is no seperate controller in MVC1.So burden of having both Controller and view in jsp is more.JSP will implement both Controller and View components.
atulkumar81
- Apr 23rd, 2007
There is MVC means Model, View & Controller, There is no MVC1 & MVC2, There is Model1 & Model2 Architecture
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What is the servlet?
Servlets are modules that extend request/response-oriented servers, such as Java-enabled web servers. For example, a servlet may be responsible for taking data in an HTML order-entry form and applying the business logic used to update a company's order database.
sowmyarao.r
- Aug 19th, 2009
Servlet is a web-component. It is a server side technology. It contains?JAVA code plus HTML code. It produces dynamic web pages programatically.
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What is the use of Service() in servlets? How is that method invoked?
vinaymudgil007
- Aug 30th, 2009
Service method is used to serve to client [which intern calls doGet/doPost methods depending on type of requests].......This service() method is called by the servlet container....Thanks,Vinay
myogeshchavan97
- Jul 26th, 2009
When init() method returns successfully then only service() method is called by the servlet container.This method handles each new request coming from the client and new thread is created in the same ...
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Session and Cookie
What is the different between session and cookies? Where is the session information stored? In RAM of the Client or Disk of the Client or it is stored on the server?
vinaymudgil007
- Aug 30th, 2009
well, the purpose of session and cookie is the same --- to maintain the state [in a typical web application, based on http protocol]Session -- Its stored at server side [containers memory, R...
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What is the Servlet Interface?
The central abstraction in the Servlet API is the Servlet interface. All servlets implement this interface, either directly or, more commonly, by extending a class that implements it such as HttpServlet.Servlets-->Generic Servlet-->HttpServlet-->MyServlet.The Servlet interface declares, but does not implement, methods that manage the servlet and its communications with clients. Servlet writers...
senthil_2009
- Sep 3rd, 2009
The central abstraction in the Servlet API is the Servlet interface. All servlets implement this interface, either directly or, more
trinadhd
- Jul 7th, 2009
It is nothing but an interface which contains set of method names (prototypes).Those are called servlet life cycle methods.init(ServletConfig)getServletConfig()service(SeveletRequest , ServletResponce...
Servlets Interview Questions
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