1. Yes PreparedStatement is and interface. It was in 
java.sql package.
2. PreparedStatement interface creates an object that 
represents a precompiled SQL statement. By using this we 
can protect from SQL Injection.

suppose if the string contains same select statement with
different set of values then fo for PreparedStatement..

ex:String str="select ename,eage from emp where ename=?";

 yes it is interface provided by java soft people in their
api specification

Types of Hibernate instance states:-

Transient- The instance is not associated with any
persistence context.

persistence- The instance is associated with a persistence
context.

Detached-The instance is associated with a persistence
context which has been closed- currently not associated.

The mechanism of inheriting the features of more than one 
base class into a single class is known as multiple 
inheritance. Java does not support multiple inheritance but 
the multiple inheritance can be achieved by using the 
interface.In Java Multiple Inheritance can be achieved 
through use of Interfaces by implementing more than one 
interfaces in a class.

Defect is a flaw in any aspect of software or requirements 
that may contribute to the occurrence of one or more 
failures and it is a runtime exception in java.

To Create Session object to use hibernate in an 
application  SessionFactory is required.
When buildSessionFactory()method is called hibernate 
decides about various sql statements,that has to be used to 
access various tables and creates SeessionFactory object.
This operation is expensive and it should be used only once.

Application obtains session instances from Session Factory.
Only single SessionFactory for the whole application.

SessionFactory caches generate SQL statements and other
mapping metadata that Hibernate uses at runtime.

Cached data that has been read in one unit of work and may
be reused in a future unit of work.

SessionFactory sessionFactory =
Configuration.buildSessionFactory();

There are no external variables in jsp unless and until you 
use scriplets(java snipets)

you can use application.setAttribute("variablename", Object
value);
 
ie Integer globalVariable = new Integer(15);
application.setAttribute("global", globalVariable);
 
to retrieve it you would
 
Integer globalVariable =
(Integer)application.getAttribute("global");
 
etc.. this can be passed on between pages

As XML stands for extensible markup language, the name 
itself conveys the meaning that it's fleible, XML is same 
regardless your implementation language (java or .Net).

As webservices considered, XML's application and advantages 
can be experienced and understood vey easily.

in simple words

.Net<->Ser/Deser<->XML<->Ser/Deser<->Java

xml,as we know extensible markup language is actually used as an interface between two different applications..something like a platform between them..and its much better than html...

XML = eXtensible Markup Language.XML is become an internet
standard for sharing data over internet.

XML=eXtensible Markup Language.It is used to transfer data.

XML (extensible markup language) serves as a common 
platform for the transmission and sharing of data between 
separate systems, allowing the rapid development of Web 
services that query, retrieve and share data among many 
sources. 
XML is not just a universal data format; it is also a 
universal library of technologies (including XSLT, XSL-FO, 
XPath, XQuery, DOM) for transforming documents between 
otherwise incompatible formats, presenting data in 
particular styles and formats, querying data from data 
sources, and manipulating data in a hierarchical, tree-like 
form. XML standards have been implemented in every major 
operating system and programming language, ensuring that 
one of your most important assets - your data - will always 
be accessible in the future.

XML is a language to transfer the data over the internet
easy than others.......For instance if we r using the
database mean 
the connection should open then only we can transfer the data

!!! XML is a language to transfer the data over the internet
easy than others.......For instance if we r using the
database mean 
the connection should open then only we can transfer the 
data !!!

XML is meta data language , it can be used to describe data 
about data and can be used to store data and also can be 
used to transfer data over network

we use XML for Cross Platform communication.
While coming to Web Applications ,XML file plays a key role
such as configuring the web components like
servlets,ActionForm and ACtion classes(Struts) etc.Entire
flow of Web application is stored in XML file.
The importance of XML file in various web components.
1.web.xml 
2.struts-config.xml(Struts Framework)
3.hibernate-config.xml and mapping.xml (Hibernate)
4.beans.xml (Spring framew work)
5.applications.xml(EJB)

we use XML to focus on how data is,basically to synchronise
data we use XML

hi,

The main use of RequestDispatcher is when u want to transfer
control from one webapplication to another webapplication
deployed in same server(its web/ app server). 

If you want to transfer control from one webapplication to
another webapplication those are deployed in different
servers( Ex one in Tomcat, another in Weblogic) use
response.sendRedirect("url"); method.

if u want any confirmation please call me.

my mobile no is 09096272808

The main use of Request Dispatcher Objest is to share 
request object between two servlets

RequestDispatch is mainly used to shipping request 
attributes from one servlet/jsp to another servlet/jsp. 
While doing this we first create RequestDispatch instance 
with string url as parameter to where request data to be 
shipped. Then we cal reqDispatchReference.forward
(request,response) method. This is something like assigning 
work to third party.
Ex:(to forward request data from Servlet1 to page2.jsp)
class Servlet1 extends HttpServlet{
public void service(... request,... response){
...........
RequestDispatcher rd=request.RequestDispatcher("page2.jsp");
try
{
rd.forward(request,response);
}
catch(Exception e)
{
}
}
}

tomcate is webserver..and ejb is distributed component we 
cant deploy it in web server so we need app server just use 
weblogic.