Rep) Java 2 Platform, Enterprise Edition.

Q)   What is J2EE application

Rep) Any deployable unit of J2EE functionality. This can be
a single J2EE module or a group of modules packaged
into an EAR file along with a J2EE application
deployment descriptor. J2EE applications are typically
engineered to be distributed across multiple computing
tiers.

Q)  What is J2EE component

Rep) A self-contained functional software unit supported by
a container and configurable at deployment time. The
J2EE specification defines the following J2EE
components: Application clients and applets are
components that run on the client. Java servlet and
JavaServer Pages (JSP) technology components are Web
components that run on the server. Enterprise
JavaBeans (EJB) components (enterprise beans) are
business components that run on the server. J2EE
components are written in the Java programming
language and are compiled in the same way as any
program in the language. The difference between J2EE
components and “standard” Java classes is that J2EE
components are assembled into a J2EE application,
verified to be well formed and in compliance with the
J2EE specification, and deployed to production, where
they are run and managed by the J2EE server or client
container.

Q)  What is J2EE module

Rep) A software unit that consists of one or more J2EE
components of the same container type and one
deployment descriptor of that type. There are four
types of modules: EJB, Web, application client, and
resource adapter. Modules can be deployed as
stand-alone units or can be assembled into a J2EE
application.

Q)  What is J2EE product

Rep) An implementation that conforms to the J2EE platform
specification.

Q)   What is J2EE product provider

Rep) A vendor that supplies a J2EE product.

Q)  What is J2EE server

Rep) The runtime portion of a J2EE product. A J2EE server
provides EJB or Web containers or both.

Q)   What is J2ME

Rep) Abbreviate of Java 2 Platform, Micro Edition.

Q)  What is J2SE

Rep) Abbreviate of Java 2 Platform, Standard Edition.

Q)  What is JAR

Rep) Java archive. A platform-independent file format that
permits many files to be aggregated into one file.

Q)   What is Java 2 Platform, Enterprise Edition(J2EE)

Rep) An environment for developing and deploying enterprise
applications. The J2EE platform consists of a set of
services, application programming interfaces (APIs),
and protocols that provide the functionality for
developing multitiered, Web-based applications.

Q)  What is Java 2 Platform, Micro Edition (J2ME)

Rep) A highly optimized Java runtime environment targeting
a wide range of consumer products, including pagers,
cellular phones, screen phones, digital set-top boxes,
and car navigation systems.

Q)  What is Java 2 Platform, Standard Edition (J2SE)

Rep) The core Java technology platform.

Q)  What is Java API for XML Processing (JAXP)

Rep) An API for processing XML documents. JAXP leverages
the parser standards SAX and DOM so that you can
choose to parse your data as a stream of events or to
build a tree-structured representation of it. JAXP
supports the XSLT standard, giving you control over
the presentation of the data and enabling you to
convert the data to other XML documents or to other
formats, such as HTML. JAXP provides namespace
support, allowing you to work with schema that might
otherwise have naming conflicts.

Q)  What is Java API for XML Registries (JAXR)

Rep) An API for accessing various kinds of XML registries.

Q)  What is Java API for XML-based RPC (JAX-RPC)

Rep) An API for building Web services and clients that use
remote procedure calls and XML

Q)   What is Java IDL

Rep) A technology that provides CORBA interoperability and
connectivity capabilities for the J2EE platform. These
capabilities enable J2EE applications to invoke
operations on remote network services using the Object
Management Group IDL and IIOP.

Q)  What is Java Message Service (JMS)

Rep) An API for invoking operations on enterprise messaging
systems.

Q)  What is Java Naming and Directory Interface (JNDI)

Rep) An API that provides naming and directory
functionality.

Q)   What is Java Secure Socket Extension (JSSE)

Rep) A set of packages that enable secure Internet
communications.

Q)   What is Java Transaction API (JTA)

Rep) An API that allows applications and J2EE servers to
access transactions.

Q)  What is Java Transaction Service (JTS)

Rep) Specifies the implementation of a transaction manager
that supports JTA and implements the Java mapping of
the Object Management Group Object Transaction Service
1.1 specification at the level below the API.

Q)  What is JavaBeans component

Rep) A Java class that can be manipulated by tools and
composed into applications. A JavaBeans component must
adhere to certain property and event interface
conventions.

Q)  What is JavaMail

Rep) An API for sending and receiving email.

Q)   What is JavaServer Faces Technology

Rep) A framework for building server-side user interfaces
for Web applications written in the Java programming
language.

Q)  What is JavaServer Faces conversion model

Rep) A mechanism for converting between string-based markup
generated by JavaServer Faces UI components and
server-side Java objects.

Q)  What is JavaServer Faces event and listener model

Rep) A mechanism for determining how events emitted by
JavaServer Faces UI components are handled. This model
is based on the JavaBeans component event and listener
model.

Q)  What is JavaServer Faces _expression language

Rep) A simple _expression language used by a JavaServer
Faces UI component tag attributes to bind the
associated component to a bean property or to bind the
associated component’s value to a method or an
external data source, such as a bean property. Unlike
JSP EL expressions, JavaServer Faces EL expressions
are evaluated by the JavaServer Faces implementation
rather than by the Web container.

Q)  What is JavaServer Faces navigation model

Rep) A mechanism for defining the sequence in which pages
in a JavaServer Faces application are displayed.

Q)  What is JavaServer Faces UI component

Rep) A user interface control that outputs data to a client
or allows a user to input data to a JavaServer Faces
application.

Q)  What is JavaServer Faces UI component class

Rep) A JavaServer Faces class that defines the behavior and
properties of a JavaServer Faces UI component.

Q)  What is JavaServer Faces validation model

Rep) A mechanism for validating the data a user inputs to a
JavaServer Faces UI component.

Q)  What is JavaServer Pages (JSP)

Rep) An extensible Web technology that uses static data,
JSP elements, and server-side Java objects to generate
dynamic content for a client. Typically the static
data is HTML or XML elements, and in many cases the
client is a Web browser.

Q)  What is JavaServer Pages Standard Tag Library(JSTL)

Rep) A tag library that encapsulates core functionality
common to many JSP applications. JSTL has support for
common, structural tasks such as iteration and
conditionals, tags for manipulating XML documents,
internationalization and locale-specific formatting
tags, SQL tags, and functions.

Q)  What is JAXR client

Rep) A client program that uses the JAXR API to access a
business registry via a JAXR provider.

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Servlets provide a Java based solution used to address the problems currently associated with doing server side programming including inextensible scripting solution, platform specific API’s, and incomplete interfaces.

Servlets are objects that confirm to a specific interface that can be plugged into a Java based server. Servlets are to the server side what applets are to the client side object byte code that can be dynamically loaded off the net.
They differ from applets. In that they are face less objects (with out graphics or GUI component).They serve as platform independent, dynamically loadable, pluggable  helper byte code objects on the server side that can be used to dynamically extend server side functionality.

For example, an HTTP servlet can be used to generate dynamic HTML content. When you use servlets to do dynamic content you get the following advantages:

They are faster and cleaner than CGI scripts
They use a  standard API (the servlet API)
They provide all the advantages of Java(run on variety of    servers with out needing to be rewritten)

The Attractiveness of Servlets

There are many features of servlets that make them easy and attractive to use. These include:
Easily configured using the GUI based admin Tool.
Can be loaded and invoked from a local disc or remotely across the network.
Can be linked together, or chained so that on a servlet can call another servlet, or several servlets in sequence.
Can be called dynamically from within HTML pages, using server side include tags.
Are secure- even when downloading across the net work, the servlet security model and servlet sandbox protect your system from unfriendly behavior.

The Advantages of the servlet API

One of the great advantages of the servlet API is protocol independence. It assumes nothing about:
The protocol being used to transmit on the net
How it is loaded
The server environment it will be running in tjese qualities are important, because it allows the servlet API to be embedded in many different kindsof servers.
There are other advantages to the servlet API  as well.
These include:
It’s extensible-you can inherit all your functionality from the classes made available to you;
It’s simple, small, and easy to use.

JAVA SERVLET FEATURES:

The JavaServer provides several important servlet features.
These includes:
Loading and Invoking Servlets

Servlets can be loaded both locally and remotely.

Filters and Servlet Chaining

The JavaServer uses mime types to call servlets sequentially.

Server-Side Includes

Server can be invoked from dynamic HTML docements using    server-side include tags.

Replacing CGI Scripts

Servlets are an effective substitute for CGI scripts, and provide a faster and cleaner way to genarate dynamic documents.

INTERNAL SERVLETS:

The Java TM Web Server TM servlet architecture is very flexible and the server takes advantage of thie by dividing  its work among several internal servlets. These are:

File Servlet:

The File Servlet provides the standard document serving capabilities of Java Web Server. This servlet includes a caching mechanism to speed up response times for frequently accessed files.

Invoker Servlet:

The purpose of this servlet is to invoke other servlets which are explicitly requested by name, that is

http://<server-host-name>/servlets/servlet name.

Server Side Include Servlet:

Servlets can be embedded within html documents using the servlet tag. When the server detects the servlet, and sends output of the servlet to the client at the point where the servlet tag was embedded.

Admin Servlet:

The Admin servlet facilitates administration of the Java web server through a GUI front end Administration Tool.

CGI Servlet:

This servlet acts as a gateway for CGI 1.1 interface. This servlet allows any program that utilizes the CGI 1.1     standard to under operate Java Web Server.

Image Map Servlet:

This servlet implements server-side image maps utilizing an extension of standard NCSA map files.

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Rep) Exceptions that are thrown by java runtime systems can be handled by Try and catch blocks. With throw exception we can handle the exceptions thrown by the program itself. If a method is capable of causing an exception that it does not
handle, it must specify this behavior so the callers of the method can guard
against that exception.

Q)   What is the difference between ‘Exception’ and ‘error’ in java?

Rep) Exception and Error are the subclasses of the Throwable class. Exception class is used for exceptional conditions that user program should catch. With exception class we can subclass to create our own custom exception.
Error defines exceptions that are not excepted to be caught by you program. Example is Stack Overflow.

Q)  What is ‘Resource leak’?

Rep) Freeing up other resources that might have been allocated at the beginning of a method.

Q)  What is the ‘finally’ block?

Rep) Finally block will execute whether or not an exception is thrown. If an exception is thrown, the finally block will execute even if no catch statement match the exception. Any time a method is about to return to the caller from inside try/catch block, via an uncaught exception or an explicit return statement, the finally clause is also execute.

Q)  Can we have catch block with out try block? If so when?

Rep) No. Try/Catch or Try/finally form a unit.

Q)  What will happen to the Exception object after exception handling?

Rep) It will go for Garbage Collector. And frees the memory.

Q)  How many Exceptions we can define in ‘throws’ clause?

Rep) We can define multiple exceptions in throws clause.
Signature is.. : type method-name (parameter-list) throws exception-list

Q)  The finally block is executed when an exception is thrown, even if no catch matches it.
True/False

Rep) True

Q)   The subclass exception should precede the base class exception when used within the catch clause.
True/False

Rep) True

Q)   Exceptions can be caught or rethrown to a calling method.
True/False

Rep) True

Q)  The statements following the throw keyword in a program are not executed.
True/False

Rep) True

Q)  The toString ( ) method in the user-defined exception class is overridden.
True/False

Rep) True

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import java.lang.*;  //its’ a default package which will import

class LeapYear {

public static void main(String args[])throws Exception {

Calendar cal=Calendar.getInstance();

int year=cal.get(Calendar.YEAR);

if(year % 4 == 0 && (year % 100 != 0 || year % 400 == 0))

{   System.out.println(”Leap Year”);          }else  {

System.out.println(”Not a Leap Year);      }

}

}  // The Meaning of above is every 4 year’s the LeapYear comes and when The Centuries comes into pictures it will divided by the 400 so that the remainder should be zera is the Leap year

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Rep) Enterprise JavaBeans.

Q) What is EJB container

Rep) A container that implements the EJB component contract
of the J2EE architecture. This contract specifies a
runtime environment for enterprise beans that includes
security, concurrency, life-cycle management,
transactions, deployment, naming, and other services.
An EJB container is provided by an EJB or J2EE server.

Q) What is EJB container provider

Rep) A vendor that supplies an EJB container.

Q) What is EJB context

Rep) A vendor that supplies an EJB container. An object
that allows an enterprise bean to invoke services
provided by the container and to obtain the
information about the caller of a client-invoked
method.

Q) What is EJB home object

Rep) An object that provides the life-cycle operations
(create, remove, find) for an enterprise bean. The
class for the EJB home object is generated by the
container’s deployment tools. The EJB home object
implements the enterprise bean’s home interface. The
client references an EJB home object to perform
life-cycle operations on an EJB object. The client
uses JNDI to locate an EJB home object

Q) What is EJB JAR file

Rep) A JAR archive that contains an EJB module.

Q) What is EJB module

Rep) A deployable unit that consists of one or more
enterprise beans and an EJB deployment descriptor.

Q) What is EJB object

Rep) An object whose class implements the enterprise bean’s
remote interface. A client never references an
enterprise bean instance directly; a client always
references an EJB object. The class of an EJB object
is generated by a container’s deployment tools.

Q) What is EJB server

Rep) Software that provides services to an EJB container.
For example, an EJB container typically relies on a
transaction manager that is part of the EJB server to
perform the two-phase commit across all the
participating resource managers. The J2EE architecture
assumes that an EJB container is hosted by an EJB
server from the same vendor, so it does not specify
the contract between these two entities. An EJB server
can host one or more EJB containers.

Q) What is EJB server provider

Rep) A vendor that supplies an EJB server.

Q) What is element

Rep) A unit of XML data, delimited by tags. An XML element
can enclose other elements.

Q) What is empty tag

Rep) A tag that does not enclose any content

Q) What is enterprise bean

Rep) A J2EE component that implements a business task or
business entity and is hosted by an EJB container;
either an entity bean, a session bean, or a
message-driven bean.

Q) What is enterprise bean provider

Rep) An application developer who produces enterprise bean
classes, remote and home interfaces, and deployment
descriptor files, and packages them in an EJB JAR
file.

Q) What is enterprise information system

Rep) The applications that constitute an enterprise’s
existing system for handling companywide information.
These applications provide an information
infrastructure for an enterprise. An enterprise
information system offers a well-defined set of
services to its clients. These services are exposed to
clients as local or remote interfaces or both.
Examples of enterprise information systems include
enterprise resource planning systems, mainframe
transaction processing systems, and legacy database
systems.

Q) What is enterprise information system resource

Rep) An entity that provides enterprise information
system-specific functionality to its clients. Examples
are a record or set of records in a database system, a
business object in an enterprise resource planning
system, and a transaction program in a transaction
processing system.

Q) What is Enterprise JavaBeans (EJB)

Rep) A component architecture for the development and
deployment of object-oriented, distributed,
enterprise-level applications. Applications written
using the Enterprise JavaBeans architecture are
scalable, transactional, and secure.

Q) What is Enterprise JavaBeans Query Language (EJB QL)

Rep) Defines the queries for the finder and select methods
of an entity bean having container-managed
persistence. A subset of SQL92, EJB QL has extensions
that allow navigation over the relationships defined
in an entity bean’s abstract schema.

Q) What is an entity

Rep) A distinct, individual item that can be included in an
XML document by referencing it. Such an entity
reference can name an entity as small as a character
(for example, <, which references the less-than symbol
or left angle bracket, <). An entity reference can
also reference an entire document, an external entity,
or a collection of DTD definitions.

Q) What is entity bean

Rep) An enterprise bean that represents persistent data
maintained in a database. An entity bean can manage
its own persistence or can delegate this function to
its container. An entity bean is identified by a
primary key. If the container in which an entity bean
is hosted crashes, the entity bean, its primary key,
and any remote references survive the crash.

Q) What is entity reference

Rep) A reference to an entity that is substituted for the
reference when the XML document is parsed. It can
reference a predefined entity such as < or reference
one that is defined in the DTD. In the XML data, the
reference could be to an entity that is defined in the
local subset of the DTD or to an external XML file (an
external entity). The DTD can also carve out a segment
of DTD specifications and give it a name so that it
can be reused (included) at multiple points in the DTD
by defining a parameter entity.

Q) What is error

Rep) A SAX parsing error is generally a validation error;
in other words, it occurs when an XML document is not
valid, although it can also occur if the declaration
specifies an XML version that the parser cannot
handle. See also fatal error, warning.

Q) What is Extensible Markup Language

Rep) XML.

Q) What is external entity

Rep) An entity that exists as an external XML file, which
is included in the XML document using an entity
reference.

Q) What is external subset

Rep) That part of a DTD that is defined by references to
external DTD files.

Q) What is fatal error

Rep) A fatal error occurs in the SAX parser when a document
is not well formed or otherwise cannot be processed.
See also error, warning.

Q) What is filter

Rep) An object that can transform the header or content (or
both) of a request or response. Filters differ from
Web components in that they usually do not themselves
create responses but rather modify or adapt the
requests for a resource, and modify or adapt responses
from a resource. A filter should not have any
dependencies on a Web resource for which it is acting
as a filter so that it can be composable with more
than one type of Web resource.

Q) What is filter chain

Rep) A concatenation of XSLT transformations in which the
output of one transformation becomes the input of the
next.

Q) What is finder method

Rep) A method defined in the home interface and invoked by
a client to locate an entity bean.

Q) What is form-based authentication

Rep) An authentication mechanism in which a Web container
provides an application-specific form for logging in.
This form of authentication uses Base64 encoding and
can expose user names and passwords unless all
connections are over SSL.

Q) What is general entity

Rep) An entity that is referenced as part of an XML
document’s content, as distinct from a parameter
entity, which is referenced in the DTD. A general
entity can be a parsed entity or an unparsed entity.

Q) What is group

Rep) An authenticated set of users classified by common
traits such as job title or customer profile. Groups
are also associated with a set of roles, and every
user that is a member of a group inherits all the
roles assigned to that group.

Q) What is handle

Rep) An object that identifies an enterprise bean. A client
can serialize the handle and then later deserialize it
to obtain a reference to the enterprise bean.

Q) What is home handle

Rep) An object that can be used to obtain a reference to
the home interface. A home handle can be serialized
and written to stable storage and deserialized to
obtain the reference.

Q) What is home interface

Rep) One of two interfaces for an enterprise bean. The home
interface defines zero or more methods for managing an
enterprise bean. The home interface of a session bean
defines create and remove methods, whereas the home
interface of an entity bean defines create, finder,
and remove methods.

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Rep) Enterprise Archive file. A JAR archive that contains a
J2EE application.

Q) What is JAR file

Rep) Java Archive file it contains a J2EE application.

You can create a JAR file using the command

jar cf XYZ.jar *.class *.gif

if will compress all the .class files and the related gif files to the one file called jar

You can extract the JAR file using the command

jar xf XYZ.jar

Updating the existing JAR file

jar -uf XYZ.jar file1.class

Q) What is WAR file

Rep) Enterprise Archive file. A JAR archive that contains a
J2EE application.

You can create a WAR file using the command

jar -cfv XYZ.war

You can extract a WAR file using the command

jar -xfv XYZ.war

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Rep) Compatibility test suite. A suite of compatibility
tests for verifying that a J2EE product complies with
the J2EE platform specification.

Q) What is data

Rep) The contents of an element in an XML stream, generally
used when the element does not contain any
subelements. When it does, the term content is
generally used. When the only text in an XML structure
is contained in simple elements and when elements that
have subelements have little or no data mixed in, then
that structure is often thought of as XML data, as
opposed to an XML document.

Q) What is DDP

Rep) Document-driven programming. The use of XML to define
applications.

Q) What is declaration

Rep) The very first thing in an XML document, which
declares it as XML. The minimal declaration is . The
declaration is part of the document prolog.

Q) What is declarative security

Rep) Mechanisms used in an application that are expressed
in a declarative syntax in a deployment descriptor.

Q) What is delegation

Rep) An act whereby one principal authorizes another
principal to use its identity or privileges with some
restrictions.

Q) What is deployer

Rep) A person who installs J2EE modules and applications
into an operational environment.

Q) What is deployment

Rep) The process whereby software is installed into an
operational environment.

Q) What is deployment descriptor

Rep) An XML file provided with each module and J2EE
application that describes how they should be
deployed. The deployment descriptor directs a
deployment tool to deploy a module or application with
specific container options and describes specific
configuration requirements that a deployer must
resolve.

Q) What is destination

Rep) A JMS administered object that encapsulates the
identity of a JMS queue or topic. See point-to-point
messaging system, publish/subscribe messaging system.
68. What is digest authentication

An authentication mechanism in which a Web application
authenticates itself to a Web server by sending the
server a message digest along with its HTTP request
message. The digest is computed by employing a one-way
hash algorithm to a concatenation of the HTTP request
message and the client’s password. The digest is
typically much smaller than the HTTP request and
doesn’t contain the password.

Q) What is distributed application

Rep) An application made up of distinct components running
in separate runtime environments, usually on different
platforms connected via a network. Typical distributed
applications are two-tier (client-server), three-tier
(client-middleware-server), and multitier
(client-multiple middleware-multiple servers).

Q) What is document

Rep) In general, an XML structure in which one or more
elements contains text intermixed with subelements.

Q) What is Document Object Model

Rep) An API for accessing and manipulating XML documents as
tree structures. DOM provides platform-neutral,
language-neutral interfaces that enables programs and
scripts to dynamically access and modify content and
structure in XML documents.

Q) What is document root

Rep) The top-level directory of a WAR. The document root is
where JSP pages, client-side classes and archives, and
static Web resources are stored.

Q) What is DTD

Rep) Document type definition. An optional part of the XML
document prolog, as specified by the XML standard. The
DTD specifies constraints on the valid tags and tag
sequences that can be in the document. The DTD has a
number of shortcomings, however, and this has led to
various schema proposals. For example, the DTD entry
says that the XML element called username contains
parsed character data-that is, text alone, with no
other structural elements under it. The DTD includes
both the local subset, defined in the current file,
and the external subset, which consists of the
definitions contained in external DTD files that are
referenced in the local subset using a parameter
entity.

Q) What is durable subscription

Rep) In a JMS publish/subscribe messaging system, a
subscription that continues to exist whether or not
there is a current active subscriber object. If there
is no active subscriber, the JMS provider retains the
subscription’s messages until they are received by the
subscription or until they expire.

Q) What is ebXML

Rep) Electronic Business XML. A group of specifications
designed to enable enterprises to conduct business
through the exchange of XML-based messages. It is
sponsored by OASIS and the United Nations Centre for
the Facilitation of Procedures and Practices in
Administration, Commerce and Transport (U.N./CEFACT).

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Rep) The process that verifies the identity of a user,
device, or other entity in a computer system, usually
as a prerequisite to allowing access to resources in a
system. The Java servlet specification requires three
types of authentication-basic, form-based, and
mutual-and supports digest authentication.

Q) What is authorization?

Rep) The process by which access to a method or resource is
determined. Authorization depends on the determination
of whether the principal associated with a request
through authentication is in a given security role. A
security role is a logical grouping of users defined
by the person who assembles the application. A
deployer maps security roles to security identities.
Security identities may be principals or groups in the
operational environment.

Q) What is authorization constraint

Rep) An authorization rule that determines who is permitted
to access a Web resource collection.

Q) What is B2B

Rep) B2B stands for Business-to-business.

Q) What is backing bean

Rep) A JavaBeans component that corresponds to a JSP page
that includes JavaServer Faces components. The backing
bean defines properties for the components on the page
and methods that perform processing for the component.
This processing includes event handling, validation,
and processing associated with navigation.

Q) What is basic authentication

Rep) An authentication mechanism in which a Web server
authenticates an entity via a user name and password
obtained using the Web application’s built-in
authentication mechanism.

Q) What is business logic

Rep) The code that implements the functionality of an
application. In the Enterprise JavaBeans architecture,
this logic is implemented by the methods of an
enterprise bean.

Q) What is business method

Rep) A method of an enterprise bean that implements the
business logic or rules of an application.

Q) What is callback methods

Rep) Component methods called by the container to notify
the component of important events in its life cycle.

Q) What is caller

Rep) Same as caller principal.

Q) What is caller principal

Rep) The principal that identifies the invoker of the
enterprise bean method.

Q) What is cascade delete

Rep) A deletion that triggers another deletion. A cascade
delete can be specified for an entity bean that has
container-managed persistence.

Q) What is CDATA

Rep) A predefined XML tag for character data that means
“don’t interpret these characters,” as opposed to
parsed character data (PCDATA), in which the normal
rules of XML syntax apply. CDATA sections are
typically used to show examples of XML syntax.

Q) What is certificate authority

Rep) A trusted organization that issues public key
certificates and provides identification to the
bearer.

Q) What is client-certificate authentication

Rep) An authentication mechanism that uses HTTP over SSL,
in which the server and, optionally, the client
authenticate each other with a public key certificate
that conforms to a standard that is defined by X.509
Public Key Infrastructure.

Q) What is comment

Rep) In an XML document, text that is ignored unless the
parser is specifically told to recognize it.

Q) What is commit

Rep) The point in a transaction when all updates to any
resources involved in the transaction are made
permanent.

Q) What is component contract

Rep) The contract between a J2EE component and its
container. The contract includes life-cycle management
of the component, a context interface that the
instance uses to obtain various information and
services from its container, and a list of services
that every container must provide for its components.

Q) What is component-managed sign-on

Rep) A mechanism whereby security information needed for
signing on to a resource is provided by an application
component.

Q) What is connector

Rep) A standard extension mechanism for containers that
provides connectivity to enterprise information
systems. A connector is specific to an enterprise
information system and consists of a resource adapter
and application development tools for enterprise
information system connectivity. The resource adapter
is plugged in to a container through its support for
system-level contracts defined in the Connector
architecture.

Q) What is Connector architecture

Rep) An architecture for integration of J2EE products with
enterprise information systems. There are two parts to
this architecture: a resource adapter provided by an
enterprise information system vendor and the J2EE
product that allows this resource adapter to plug in.
This architecture defines a set of contracts that a
resource adapter must support to plug in to a J2EE
product-for example, transactions, security, and
resource management.

Q) What is context attribute

Rep) An object bound into the context associated with a
servlet.

Q) What is context root

Rep) A name that gets mapped to the document root of a Web
application.

Q) What is conversational state ?

Rep) The field values of a session bean plus the transitive
closure of the objects reachable from the bean’s
fields. The transitive closure of a bean is defined in
terms of the serialization protocol for the Java
programming language, that is, the fields that would
be stored by serializing the bean instance.

Q) What is CORBA

Rep) Common Object Request Broker Architecture. A
language-independent distributed object model
specified by the OMG.

Q) What is create method

Rep) A method defined in the home interface and invoked by
a client to create an enterprise bean.

Q) What is credentials

Rep) The information describing the security attributes of
a principal.

Q) What is CSS

Rep) Cascading style sheet. A stylesheet used with HTML and
XML documents to add a style to all elements marked
with a particular tag, for the direction of browsers
or other presentation mechanisms.

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Rep) J2EE is an environment for developing and deploying enterprise applications. The J2EE platform consists of a set of services, application programming interfaces (APIs), and protocols that provide the functionality for developing multitiered, web-based applications.

Q) What is the J2EE module?

Rep) A J2EE module consists of one or more J2EE components for the same container type and one component deployment descriptor of that type.

Q) What are the components of J2EE application?

Rep) J2EE component is a self-contained functional software unit that is assembled into a J2EE application with its related classes and files and communicates with other components. The J2EE specification defines the following J2EE components: Application clients and applets are client components. Java Servlet and JavaServer PagesTM (JSPTM) technology components are web components. Enterprise JavaBeansTM (EJBTM) components (enterprise beans) are business components. Resource adapter components provided by EIS and tool vendors.

Q)What are the four types of J2EE modules?

Rep)
1. Application client module
2. Web module
3. Enterprise JavaBeans module
4. Resource adapter module

Q) What does application client module contain?

Rep) The application client module contains:

–class files,
–an application client deployment descriptoor. Application client modules are packaged as JAR files with a .jar extension.

Q) What is “application assembler” ?

Rep) A person who combines J2EE components and modules into deployable application units.

Q) What is “application client” ?

Rep) A first-tier J2EE client component that executes in its own Java virtual machine. Application clients have access to some J2EE platform APIs.

Q) What is “application client container” ?

Rep) A container that supports application client components.

Q) What is “application client module” ?

Rep) A software unit that consists of one or more classes and an application client deployment descriptor.

Q) What is “application component provider” ?

Rep) A vendor that provides the Java classes that implement components’ methods, JSP page definitions, and any required deployment descriptors.

Q) What is “application configuration resource file” ?

Rep)An XML file used to configure resources for a JavaServer Faces application, to define navigationrules for the application, and to register converters,validators, listeners, renderers, and components with the application.

Q) What is “archiving”

Rep) The process of saving the state of an object and
restoring it.

Q) What is “asant” ?

ReP) A Java-based build tool that can be extended using Java classes. The configuration files are XML-based,calling out a target tree where various tasks get executed.

Q) What is “attribute” What is “asant” ?

Rep) A qualifier on an XML tag that provides additional information. with the application.

Q) What is “archiving” ?

Rep)The process of saving the state of an object and
restoring it.

Q) What is “asant”

Rep) A Java-based build tool that can be extended using Java classes. The configuration files are XML-based,calling out a target tree where various tasks get executed.

Q) What is “attribute”What is “asant” ?

Rep) A qualifier on an XML tag that provides additional information.

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The program makes two conversations(calls) with the session bean. In one call it gets the sum and in the second call it gets the difference. Between the calls state is to be maintained.

1 Step) Remote interface :

import javax.ejb.*;
import java.rmi.*;

7  Step: Copy the compiled JAR file to myserver directory:

copy CalcJar1.jar c:\weblogic \myserver

System.out.println(”sum :”+sum);
System.out.println(”Diff : “+diff);
}
}

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