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What is the need of implicit objects?
lhariPrasad
- May 5th, 2008
Not only that, it makes the interface to business logic and implementation easily.
bharaniprasanth
- Mar 11th, 2008
Yes implicit objects obviate the need to explicitly import the classes for designing the JSP's
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What is the diff. b/w PAGE,APPLICATION and SESSION implicit objects of JSP?
Madhavikari
- Apr 20th, 2006
The default time for session time out is 30 minutes.If we didn't specify any time, then after 30 mins it will destroy automatically. If we specify -1 then, the session never destroyed. Session timeout...
Madhavikari
- Apr 20th, 2006
These are the scopes of the particular jsp page.The default scpoe of the jsp page is 'PAGE'If the jsp page scope is 'Request', the scope is for that particular request.If the page scope is 'Application', the scope is for entire application.
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Which tag in the jsp is used to define the error page. (Multiple choice)
Skill/Topic: Programming ConstructsA) None of the above B) C)
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Following methods can be overridden in the JSP page. (Multiple choice)
Skill/Topic: Programming ConstructsA) jspDestroy()B) jspInit()C) _jspService()D) getParameter()
Varsha Mulik
- Aug 13th, 2019
A,B
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In the properties files _________ defines global Servlet settings and list of servlets in the system.
Skill/Topic: FundamentalsA) Servlet.properties B) Page.properties C) Session.properties D) None of the above
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When many Users are browsing the same application at the same time and they click the "Submit" button will many objects be created for each and every User?
umar farooq
- Jul 24th, 2011
NO, There will be one single instance of the servlet in the web-container ,when request arrives to the server a thread will be created rather creating the object. so that multiple request will have ...
vinaymudgil007
- Mar 31st, 2011
Single servlet object will be loaded in memory and one thread per request would be created by the container to serve those requests.Thanks,Vinay
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<%
PrintWriter print = request.getWriter();
print.println("Welcome");
>%
Suppose you access this JSP file, Find out your answer.
a) A blank page will be displayed.
b) A page with the text Welcome is displayed
c) An exception will be thrown because the implicit out object is not used
d) An exception will be thrown because PrintWriter can be used in servlets only
">Write the following code for a JSP page:<%@ page language = "java" %> <%PrintWriter print = request.getWriter();print.println("Welcome");>%Suppose you access this JSP file, Find out your answer.a) A blank page will be displayed.b) A page with the text Welcome is displayedc) An exception will be thrown because the implicit out object is not usedd) An exception will be thrown because PrintWriter can be used in servlets only
A page with the text Welcome is displayed
spring
- Apr 6th, 2009
This code will print "Welcome"request does't have any getWriter() defined, only response has.<%@ page language = "java" %><%java.io.PrintWriter print = response.getWriter();print.println("Welcome");%>
bharaniprasanth
- Mar 11th, 2008
I think we have to use Jsp Writer as a part of specification ...PrintWriter is for servlets exclusively..
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Where do you declare methods in JSP?
pradeepkmr18
- Jun 11th, 2008
In jsp declarations we can declare methods and variables<%! int x; public void tone() ...
bharaniprasanth
- Mar 10th, 2008
Declarations go outside the service method of converted servlet so ...just delcaring variables...declare it like <%! public void add(int a , int b){ //body}%>
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When we deploy an application into a server, to which servlets these JSP will convert into?
ishar.Gsingh
- Dec 20th, 2009
When you deploy an application the JSP's are never converted to servlets until first request. When first request comes in, for example my.jsp will be converted to my_jsp.java then my_jsp...
subhas2008
- Jul 28th, 2008
JSP?is ?converted to a servlet called??translated servlets which contains _JspInit(), _JspService and _JspDestroy() methods.
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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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What is Declaration
shakeel
- Sep 30th, 2005
? A Declaration is a block of Java code in a JSP that is used to define class-wide variables and methods in the generated class file.? ...
MD.SHAKEEL AHMAD
- Sep 30th, 2005
? A Declaration is a block of Java code in a JSP that is used to define class-wide variables and methods in the generated class file.? ...
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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 the jsp changes will be effected in servlet file after converting?
khan.nomanahmed
- Jan 30th, 2007
Before executing server checks timestamp of the jsp file and previous generated servlet file. If they differs jspc compiler recompiles it.
nitin
- Dec 16th, 2005
First whenever u save your jsp file it will recompile at that time it will create a servlet file .so whenever ur saving a jsp file the jsp engine will create a servlet file.
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In Oracle table some fields are "null".By default it will show as "null" in JSP page text box.But i dont want that. I want as blank textbox.What i can do for that?
umasank
- Feb 17th, 2006
You can use the wasNull() method of ResultSet to find if the column read in the table has a NULL and then set the bean value as you want.
ejazazeem79
- Dec 9th, 2005
One way is to use NVL(fieldName, ' ') in the SQL Query and the other one is to use ?: operator in java/jsp/servlet while get value from Resultset i.e. (fieldName == null)? " " : fieldName;
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In one class i stored the key and values in the hashmap.so using key value i have to check wheterthe value for key is correct or not.so howto retreive the key and values in jsp page
rameshkumar
- Jul 20th, 2006
You can place the HashTable inside the setAttribute() method of the request object so that it can be accessed in the other page using the getAttribute() method.
d_shrivastava
- Feb 8th, 2006
You can use the tag lib. of struts for the same.iterator will help you.you can get the value.
JSP Interview Questions
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