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What is the difference between jsp and servlet life cycles?
ishar.Gsingh
- Dec 20th, 2009
Amendment to the Neha's Answer:Jsp's are never converted to the .java source code until the first request asks it. On ther hands you can pre initiate the servlets
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If we declare a page isThreadSafe="false" then how the page will act?
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Editorial / Best Answer
satish_bakde- Member Since Dec-2007 | Dec 7th, 2007
A JSP page is by default thread unsafe. That means when server finds a request to JSP, an instance is created and the request is processed. The code inside service method is processed. While in this process, if another request arrives, Server again starts executing the code inside service method for 2nd one. Multitasking is invoked to switch CPU between execution of these 2 threads created. Both are executing same code so, so if any thread changes a variable value and then second reads it, it will get changed one.
Though this is bad programming practise to have code like this, in case becomes unavoidable. At this time make page threadSafe="true". This will make service method synchronized and at a time only one thread will execute the code. other thread have to wait till that time. Assume how bad will be the response time of server when 100s of requests arrives at a time!bharaniprasanth
- Mar 10th, 2008
Yes which is why we use servlets instead of Jsp's for handling the web requests...
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How to maintain values inside form field while uploading image using jsp?
The problem I am facing is that whenever I fill details in the form and then click on upload link then request go to upload.jsp and when after uploading the form the request comes back to registration page(1st page) then the values from all fields disappear
Rashmi Ahuja
- Jun 28th, 2012
Its better you use Jquery or java script or ajax so that we dont need to completely submit the jsp page just dialog box appear for upload picture and after uploading it will close
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Java Server Pages specification includes (Multiple choice)
Skill/Topic: Programming ConstructsA) Script language declarations, scriplets and expressions. B) JSP standard actions. C) JSP standard directivesD) A portable tag extension mechanism.
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Which codeline must be set before any of the lines that use the PrintWriter
Skill/Topic: Programming ConstructsA) setContentWriter() B) setWriter()C) setPrintType()D) setContentType()
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State true or false -- We can implement an interface in JSP
Skill/Topic: Programming ConstructsA) TrueB) False
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URL encoding is the method of replacing all the spaces and other extra characters into their corresponding _______ Characters
Skill/Topic: FundamentalsA) Hex B) Binary C) Octal D) Decimal
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What tools can be used to generate the multiple views in jsp
Skill/Topic: FundamentalsA) xalan-J B) Saxon C) Jdk1.5 D) None of the above
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What is the differnce between page and pagecontext?
Amit
- Mar 13th, 2016
Page and Pagecontext are implicit objects in jsp. These are created at JSP translated time. The page object represents the generated servlet instance itself and is used as a scope with in one jsp. Pag...
Shekar B
- Nov 18th, 2008
Page: The object is the Instance of page implementation servlet class that are processing the current request. PageContext: The PageContext specifies the single entry point to many of the page a...
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Exception Handling in JSP
How will you handle the exception without sending to error page? How will you set a message detail to the exception object?
delindia
- Jan 3rd, 2012
Example:
The exception will be thrown inside the catch:
The exception is : ${catchException}
There is an exception: ${catchException.message}
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Transfer data in JSP
How to transfer data over multiple pages?
sampra
- Mar 28th, 2012
We can set attribute in application session or request attribute.here page wont be use ful bcz scope of page is same page only
sampra
- Mar 13th, 2012
1.page
2.session
3.request.
4.application
using these scoped variables we can translate data from one resource to another
ex: request.setAttribute("key","value");
Object o=getAttribute("key"); -
How do you pass control from one JSP page to another
Satheeshgeek
- May 21st, 2008
Hi guysthere are 3 ways to do this1) <jsp:forward>2) response.sendredirect3) forward methos of requestdispatcher
shankar
- Jun 7th, 2006
hi this is shankar...........what are the differences b/w CGI and Servlets
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How does a servlet communicate with a JSP page?
The following code snippet shows how a servlet instantiates a bean and initializes it with FORM data posted by a browser. The bean is then placed into the request, and the call is then forwarded to the JSP page, Bean1.jsp, by means of a request dispatcher for downstream processing.public void doPost (HttpServletRequest request, HttpServletResponse response){try {govi.FormBean f = new govi.FormBean();String...
mullangi13
- Jul 23rd, 2008
Hi Jose Kutty,Mr. Nanda is wrong. We can create RequestDespatcher object by two ways, either by ServletRequest object request.getRequestDispatcher("/abc....
Rajkumar
- Aug 24th, 2007
A Servlet can communicate with JSP by using the RequestDispatcher mechanism.RequestDispatching is the process hand overing the request to another web component,and this component takes the response of...
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How can you store ArrayList values in a session obj? Explain.
ishar.Gsingh
- Dec 20th, 2009
HttpSession session = request.getSession();List list = new ArrayList();list.add("Hello World");list.add("Perfect World");session.setAttribute("listObject", list);
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What are the ADVANTAGES of SERVLETS over JSP?(NOTE : not advantages of JSP over SERVLETS)
Vikas Singh
- Jan 10th, 2007
Hi vmshenoy,Sevlets are slighty faster than JSP...Ultiamtily a "JSP" will be converted as a sevlets by the "JSPC". A JSP Compiler(JSPC) uses a set of rule for genrating the servlet code, so the J...
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Pass Control from one JSP page to another
Write Sample Code to pass control from one JSP page to another?
What JSP lifecycle methods can I override?
You cannot override the _jspService() method within a JSP page. You can however, override the jspInit() and jspDestroy() methods within a JSP page. jspInit() can be useful for allocating resources like database connections, network connections, and so forth for the JSP page. It is good programming practice to free any allocated resources within jspDestroy().The jspInit() and jspDestroy() methods are...
What is the Difference between sendRedirect() and Forward?
Pata Nahin
shaik_masthan
- Dec 23rd, 2005
So many difference for forward and send redirect i will explain as follows1. in forward the resource will be with in the container,in case of send redirect the resource would be outside the web contai...
j_jain_mca
- Nov 25th, 2005
SendRedirect() executes on client while Forward() executes on server. moreover redirect is a 2 phase method and forward is a 1 step process.
Hii have developed a web page.i want to restrict the user from seeing my html code from web browser how do i do that?????
hmashruf
- Jan 22nd, 2007
Hi All,How about view source option from menu bar, after disabling right click in IE? Please let me know.Thank you.
Siva Kotipalli
- Jul 26th, 2006
We can disable the Tool bar using Javascript. When we disable the tool bar and the right click then we can prevent users from viewing the code. But this only works in the browsers that support javascript.
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