JSP Interview : JSP Interview Questions -2

Page of the JSP Interview Questions.

Question: What is JSP?
Answer: JavaServer Pages (JSP) technology is the Java platform technology for delivering dynamic content to web clients in a portable, secure and well-defined way. The JavaServer Pages specification extends the Java Servlet API to provide web application developers

Question: What is the role of JSP in MVC Model?
Answer: JSP is mostly used to develop the user interface, It plays are role of View in the MVC Model.

Question: What do you understand by context initialization parameters?
Answer: The context-param element contains the declaration of a web application's servlet context initialization parameters. 
<context-param>
  <param-name>name</param-name>
  <param-value>value</param-value>
</context-param>

The Context Parameters page lets you manage parameters that are accessed through the ServletContext.getInitParameterNames and ServletContext.getInitParameter methods.

Question: Can you extend JSP technology?
Answer: JSP technology lets the programmer to extend the jsp to make the programming more easier. JSP can be extended and custom actions and tag libraries can be developed.

Question: What do you understand by JSP translation?
Answer: JSP translators generate standard Java code for a JSP page implementation class. This class is essentially a servlet class wrapped with features for JSP functionality.

Question: What you can stop the browser to cash your page?
Answer: Instead of deleting a cache, you can force the browser not to catch the page.
<% 
response.setHeader("pragma","no-cache");//HTTP 1.1 
response.setHeader("Cache-Control","no-cache"); 
response.setHeader("Cache-Control","no-store"); 
response.addDateHeader("Expires", -1); 
response.setDateHeader("max-age", 0); 
//response.setIntHeader ("Expires", -1); //prevents caching at the proxy server 
response.addHeader("cache-Control", "private"); 

%>
put the above code in your page.

Question: What you will handle the runtime exception in your jsp page?
Answer: The errorPage attribute of the page directive can be used to catch run-time exceptions automatically and then forwarded to an error processing page. 

For example:
<%@ page errorPage="customerror.jsp" %> 
above code forwards the request to "customerror.jsp"  page if an uncaught exception is encountered during request processing. Within "customerror.jsp", you must indicate that it is an error-processing page, via the directive: <%@ page isErrorPage="true" %>.