2. 1.What is difference between include action and include directive in
JSP?
Include directive Include action
Resource included during jsp translation time request time
change on included resource
reflect after
Compilation of JSP (static) Next request (dynamic)
attribute to specify resource file page
Can pass parameter No yes
Example <%@ include file="loan.jsp" %> <jsp:include page="header.jsp">
<jsp:param name="some"
value="thing"/>
</jsp:include>
3. 2.How do you define application wide error page in JSP
//error.jsp
<%@ page isErrorPage="true"%>
//login.jsp
<%@ page errorPage="error.jsp"%>
If any unhandled Exception thrown from login.jsp , error.jsp error page will be
invoked
4. 3.Difference between sendredirect and forward in Servlet
sendredirect forward
Declared in interface HttpServletResponse RequestDispatcher
syntax void sendRedirect(String url) forward(ServletRequest request,
ServletResponse response)
Visible to client yes no
Further processing within Different server or module Same server
Comparison Slower than forward as
completer new request created
Faster than sendredirect
5. 4.What is difference between Web Server and Application Server
Read more: http://java67.blogspot.com/2012/10/servlet-jsp-interview-
questions-answer-faq-experience.html#ixzz49IBh21A6
4
Web Server Application Server
support Only Servlets and JSP distributed transaction and EJB
super Can be subpart of Application
server
Include Web Server
Logical difference Provide http protocol level service Provide web service and expose
business level service
Resource utilization Less so less heavy than
application server
High so more heavy than web
server
Example Apache tomcat Glassfish,JBoss,WAS
6. 5.What is difference between ServletContext and ServletConfig
ServerConfig ServerContext
Available for one per servlet Web application
scope Like local parameter for particular
servlet
global parameter associated with
whole application
Where name value pair defined
in web.xml
inside the servlet section outside of servlet tag
Method to get object getServletConfig() getServletContext()
Example To get Shopping cart details To get the MIME type of a file or
application session related
information
7. 6.What is difference between GET and POST method in HTTP protocol
Read more: http://java67.blogspot.com/2012/10/servlet-jsp-interview-
questions-answer-faq-experience.html#ixzz49IJORF59
Read more: http://java67.blogspot.com/2012/10/servlet-jsp-interview-
questions-answer-faq-experience.html#ixzz49IGWgAiy
GET POST
Passes request parameter In URL string In request body
Limit to send data only pass limited amount of data
depending on browser
large amount of data to server i.e.
no limit
Can bookmarked or catched yes no
Mostly used for view purpose update purpose
Suitable for sensitive and
confidential information
No yes
8. 7.What is difference between URL Encoding and URL rewriting
URL Encoding URL rewriting
purpose Way to pass string to server
containing special characters by
converting special characters
Technique used maintain user
session if cookies are not
enabled or not support
Methods used java.net.URLEncoder.encode()
and
java.net.URLDecoder.decode()
java.servlet.http.HttpServletResp
onse.encodeURL(String url) and
encodeRedirectURL(String URL)
URL changes special character replaced by
another character like space with
ā%20ā
session id is appended to URL
9. 8.What is difference between Servlet and JSP
Servlet JSP
What it is Java program can be used to create
dynamic web pages
webpage scripting language that can
generate dynamic content.
Speed faster compared to JSP slower compared to Servlet as it takes
compilation time to convert into Java
Servlets.
MVC part act as a controller act as a view
Custom tag facility Not available Available e.g.tags used to call Java
beans directly
When to preferr more processing and manipulation
involved
not much processing of data required
10. 9.What is war file and how to create?
A war (web archive) file specifies the web elements. A servlet or jsp project can be
converted into a war file. Moving one servlet project from one place to another will
be fast as it is combined into a single file.
The war file can be created using jar tool found in jdk/bin directory. If you are
using Eclipse or Netbeans IDE, you can export your project as a war file.
To create war file from console, you can write following code.
jar -cvf abc.war *
11. 10.What is difference between GenericServlet and HttpServlet?
The GenericServlet is protocol independent whereas HttpServlet is HTTP protocol
specific. HttpServlet provides additional functionalities such as state management
etc.
