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|What is a output comment?|
A comment that is sent to the client in the viewable page source. The JSP engine handles an output comment as uninterrupted HTML text, returning the
|What is a Hidden Comment?|
A Comments that documents the JSP page but is not sent to the client. The JSP engine ignores a hidden comment, and does not process any code within hidden comment tags. A hidden comment is not sent to the client, either in the displayed JSP page or the HTML page source.
The hidden comment is useful when you want to hide or comment out part of your JSP page. You can use any characters in the body of the comment except the closing --%> combination. If you need to use --%> in your comment, you can escape it by typing --%>.
JSP Syntax :
<%-- comment --%> Examples <%@ page language="java" %>
A Hidden Comment
<%-- This comment will not be visible to the colent in the page source --%>
|What is a Expression?|
An expression tag contains a scripting language expression that is evaluated, converted to a String, and inserted where the expression appears in the JSP file. Because the value of an expression is converted to a String, you can use an expression within text in a JSP file. Like
|What is a Declaration?|
A declaration declares one or more variables or methods for use later in the JSP source file.
|What is a Scriptlet?|
A scriptlet can contain any number of language statements, variable or method declarations, or expressions that are valid in the page scripting language.Within scriptlet tags, you can
|What are implicit objects? List them?|
Certain objects that are available for the use in JSP documents without being declared first. These objects are parsed by the JSP engine and inserted into the generated servlet. The implicit objects re listed below
|Difference between forward and sendRedirect?|
When you invoke a forward request, the request is sent to another resource on the server, without the client being informed that a different resource is going to process the request. This process occurs completly with in the web container.
When a sendRedirtect method is invoked, it causes the web container to return to the browser indicating that a new URL should be requested. Because the browser issues a completly new request any object that are stored as request attributes before the redirect occurs will be lost. This extra round trip a redirect is slower than forward.
|What are the different scope valiues for the |
The different scope values for <jsp:useBean> are
|Explain the life-cycle mehtods in JSP?|
The generated servlet class for a JSP page implements the HttpJspPage interface of the javax.servlet.jsp package. HttpJspPage interface extends the JspPage interface which inturn extends the Servlet interface of the javax.servlet package. the generated servlet class thus implements all the methods of the these three interfaces. The JspPage interface declares only two mehtods - jspInit() and jspDestroy() that must be implemented by all JSP pages regardless of the client-server protocol. However the JSP specification has provided the HttpJspPage interfaec specifically for the JSp pages serving HTTP requests. This interface declares one method _jspService().
|How do I prevent the output of my JSP or Servlet pages from being cached by the browser?|
You will need to set the appropriate HTTP header attributes to prevent the dynamic content output by the JSP page from being cached by the browser. Just execute the following scriptlet at the beginning of your JSP pages to prevent them from being cached at the browser. You need both the statements to take care of some of the older browser versions.
<% response.setHeader("Cache-Control","no-store"); //HTTP 1.1
response.setHeader("Pragma","no-cache"'); //HTTP 1.0
response.setDateHeader ("Expires", 0); //prevents caching at the proxy server
|How does JSP handle run-time exceptions?|
You can use the errorPage attribute of the page directive to have uncaught run-time exceptions automatically forwarded to an error processing page. For example: <%@ page errorPage='error.jsp' %> redirects the browser to the JSP page error.jsp if an uncaught exception is encountered during request processing. Within error.jsp, if you indicate that it is an error-processing page, via the directive: <%@ page isErrorPage='true' %> Throwable object describing the exception may be accessed within the error page via the exception implicit object. Note: You must always use a relative URL as the value for the errorPage attribute.
|How can I implement a thread-safe JSP page? What are the advantages and Disadvantages of using it?|
You can make your JSPs thread-safe by having them implement the SingleThreadModel interface. This is done by adding the directive <%@ page isThreadSafe='false' %> within your JSP page. With this, instead of a single instance of the servlet generated for your JSP page loaded in memory, you will have N instances of the servlet loaded and initialized, with the service method of each instance effectively synchronized. You can typically control the number of instances (N) that are instantiated for all servlets implementing SingleThreadModel through the admin screen for your JSP engine. More importantly, avoid using the tag for variables. If you do use this tag, then you should set isThreadSafe to true, as mentioned above. Otherwise, all requests to that page will access those variables, causing a nasty race condition. SingleThreadModel is not recommended for normal use. There are many pitfalls, including the example above of not being able to use <%! %>. You should try really hard to make them thread-safe the old fashioned way: by making them thread-safe .
|How do I use a scriptlet to initialize a newly instantiated bean?|
A jsp:useBean action may optionally have a body. If the body is specified, its contents will be automatically invoked when the specified bean is instantiated. Typically, the body will contain scriptlets or jsp:setProperty tags to initialize the newly instantiated bean, although you are not restricted to using those alone.
|What's a better approach for enabling thread-safe servlets and JSPs? SingleThreadModel Interface or Synchronization?|
|Although the SingleThreadModel technique is easy to use, and works well for low volume sites, it does not scale well. If you anticipate your users to increase in the future, you may be better off implementing explicit synchronization for your shared data. The key however, is to effectively minimize the amount of code that is synchronzied so that you take maximum advantage of multithreading. Also, note that SingleThreadModel is pretty resource intensive from the server's perspective. The most serious issue however is when the number of concurrent requests exhaust the servlet instance pool. In that case, all the unserviced requests are queued until something becomes free - which results in poor performance. Since the usage is non-deterministic, it may not help much even if you did add more memory and increased the size of the instance pool.|
|How can I enable session tracking for JSP pages if the browser has disabled cookies?|
|What is the difference b/w variable declared inside a declaration part and variable declared in scriplet part?|
|Variable declared inside declaration part is treated as a global variable.that means after convertion jsp file into servlet that variable will be in outside of service method or it will be declared as instance variable.And the scope is available to complete jsp and to complete in the converted servlet class.where as if u declare a variable inside a scriplet that variable will be declared inside a service method and the scope is with in the service method.|
By what number should we multiply -1/5 so that the product may be 9/25?
|Profit and Loss|
A person sells an article for Rs 550, gaining 1/10 of its cost price. Its gain percentage is.
If 3x + 2y = 12 and xy = 6, then 9x2 + 4y2 = ______.
|Volume and Surface Area|
In a temple there are 25 cylindrical pillars. The radius of each pillar is 28cm and height 4m. The total cost of painting the curved surface area of pillars at the rate of Rs. 8 per m2 is:
|Problems on Ages|
After 12 years, I shall be 3 times as old as I was 4 years ago. My present age is:
|Square and Cube Root|
The smallest number by which 1100 must be multiplied so that the product becomes a perfect square is____.
What is the probability that a number selected from the numbers 1, 2, 3,…….,25 is a prime number, when each of the given numbers is equally likely to be selected?
|Square and Cube Root|
What is the smallest number by which 3087 must be divided so that the quotient is a perfect cube?
The most comfortable distance at which one can read with a normal eye is:
Cholera is caused by:
Write the name of reptile with four chambered heart?
Raj borrowed Rs. 5000 at 10% per annum on simple interest and lent the same amount at 15% per annum on compound interest. At the end of 2 years, he would ?
If the area of a square is 16 cm2, then the area of the square joining the mid-points of the sides is?
|General Knowledge of MP|
Vidisha is situated on the banks of river?
|General Knowledge of World|
When is the Human Rights Day celebrated?
|Profit and Loss|
By selling coconuts at the rate of Rs. 6/- each, a trader gained 20%. Find the cost of 100 coconuts?
|General Knowledge of India|
How many coastal state are in India?
A person is to count 4500 currency notes. Let an denote the number of notes he counts in the nth minute. If a1 = a2 = .... = a10 = 150 and a10 , a11 ,... are in an AP with common difference – 2, then the time taken by him to count all notes is ?
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