This document provides an overview of Enterprise JavaBeans (EJBs). It discusses that EJBs are reusable components that represent data and behavior, and can be combined visually using development tools. EJBs provide advantages like avoiding the need to write multi-threaded, database access, network communication, transaction management, and other complex code. EJBs from different systems can interact easily through well-defined interfaces. The document also outlines EJB containers, web browsers, applets and other Java EE components, and common scripts used to manage the Java EE server.
Overview of EJB technology.
Enterprise Java Beans (EJB) is a server-side component technology for Java EE based systems (JEE).
Beans are business logic components that implement a standard interface through which the bean is hooked into the bean container (= runtime object for bean).
A Java class implementing one of the standard bean interfaces is an Enterprise Java Bean. Beans can be accessed remotely, usually from a client tier.
The EJB standard was developed to provide a common framework for solving recurring problems in business application development like persistence, transactions,
security and runtime and lifecycle management. The EJB standard evolved greatly over time. EJB version 1 and 2 were complex and required to implement many interfaces
and exception handling in EJBs. EJB version 3 brought great simplifications and did away with interfaces by replacing these with annotations which provide greater flexibility while keeping complexity low. EJBs come in 3 different flavors: Stateless and stateful session beans and message driven beans. Entity beans of EJB version 1 and 2 were replaced by the Java Persistence API in EJB version 3.
A quick view of the types of the JDBC drivers in Java. This document contains a simpler introduction about JDBC driver, their types, advantages, disadvantages and where or in which scenario they should be used.
Overview of EJB technology.
Enterprise Java Beans (EJB) is a server-side component technology for Java EE based systems (JEE).
Beans are business logic components that implement a standard interface through which the bean is hooked into the bean container (= runtime object for bean).
A Java class implementing one of the standard bean interfaces is an Enterprise Java Bean. Beans can be accessed remotely, usually from a client tier.
The EJB standard was developed to provide a common framework for solving recurring problems in business application development like persistence, transactions,
security and runtime and lifecycle management. The EJB standard evolved greatly over time. EJB version 1 and 2 were complex and required to implement many interfaces
and exception handling in EJBs. EJB version 3 brought great simplifications and did away with interfaces by replacing these with annotations which provide greater flexibility while keeping complexity low. EJBs come in 3 different flavors: Stateless and stateful session beans and message driven beans. Entity beans of EJB version 1 and 2 were replaced by the Java Persistence API in EJB version 3.
A quick view of the types of the JDBC drivers in Java. This document contains a simpler introduction about JDBC driver, their types, advantages, disadvantages and where or in which scenario they should be used.
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Students, digital devices and success - Andreas Schleicher - 27 May 2024..pptxEduSkills OECD
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Unit 8 - Information and Communication Technology (Paper I).pdfThiyagu K
This slides describes the basic concepts of ICT, basics of Email, Emerging Technology and Digital Initiatives in Education. This presentations aligns with the UGC Paper I syllabus.
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Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
Instructions for Submissions thorugh G- Classroom.pptxJheel Barad
This presentation provides a briefing on how to upload submissions and documents in Google Classroom. It was prepared as part of an orientation for new Sainik School in-service teacher trainees. As a training officer, my goal is to ensure that you are comfortable and proficient with this essential tool for managing assignments and fostering student engagement.
The Indian economy is classified into different sectors to simplify the analysis and understanding of economic activities. For Class 10, it's essential to grasp the sectors of the Indian economy, understand their characteristics, and recognize their importance. This guide will provide detailed notes on the Sectors of the Indian Economy Class 10, using specific long-tail keywords to enhance comprehension.
For more information, visit-www.vavaclasses.com
2. EnterPrice Java:
They are components that can be connected to
form a system
They can represent data
They can represent behavior
Usually, EJBs fall into only one of these
categories
They are typically used in the server tier
EJBs can be persisted
EJBs can interact with other EJBs
3. Advantages:
EJBs are reusable components
• Can be reused in different parts of the system
• Can be packaged into libraries and sold
EJBs Can be combined visually using development IDEs
• E.g. Visual Age, Visual Café
EJBs provide convenient abstractions so it do not require
you to write:
• Multi-threaded, multiple access code
• Database access code (e.g. JDBC)
• Network communication code (i.e. it uses RMI) for client/server
communication
• Network communication code for EJB to EJB communication
• Transaction management code
EJBs from different businesses can interact easily
• This is because of their well-defined interfaces
4. 1. Containers where EJBs (and JSPs and
servlets)
are executed
2.Provide EJB functionality, including:
* Persistence through databases (using JDBC)
* Transactions (using Java Transaction Service)
3. Can provide advanced features, including:
* Load balancing
* Database connection pooling
4.Here are the major application servers:
* SJS AP, WebLogic (BEA), Internet Application
Server or iAS (Oracle), WebSphere (IBM)
5.
6. •Authentication :
The means by which communicating entities (for example,
client and server) prove to one another that they are acting on
behalf of specific identities that are authorized for access.
•Access control for resources:
The means by which interactions with resources are limited to
collections of users or programs for the purpose of enforcing
integrity, confidentiality, or availability constraints.
•Non-repudiation: The means used to prove that a user
performed some action such that the user cannot reasonably
deny having done so.
7. •Data integrity:
The means used to prove that information has not been modified
by a third party (some entity other than the source of the
information). For example, a recipient of data sent over an open
network must be able to detect and discard messages that were
modified after they were sent.
•Confidentiality or Data Privacy: The means used to ensure
that information is made available only to users who are
authorized to access it.
•Auditing: The means used to capture a tamper-resistant record
of security related events for the purpose of being able to
evaluate the effectiveness of security policies and mechanisms.
8. Client Components
A Java EE application can be web-based or non-web-
based. An application client executes on the client
machine for a non-web-based Java EE application, and a
web browser downloads web pages and applets to the
client machine for a web-based Java EE application.
Application Clients
An application client runs on a client machine and
provides a way for users to handle tasks such as Java EE
system or application administration. It typically has a
graphical user interface created from Project Swing or
Abstract Window Toolkit (AWT) APIs, but a command-line
interface is certainly possible.
Application clients directly access enterprise beans
running in the business tier. However, if the Java EE
application client requirements warrant it, an application
client can open an HTTP connection to establish
communication with a servlet running in the web tier.
9. Web Browsers
The user's web browser downloads static or dynamic Hypertext Markup
Language (HTML), Wireless Markup Language (WML), or Extensible Markup
Language (XML) web pages from the web tier. Dynamic web pages are
generated by servlets or JSP pages running in the web tier.
Applets
A web page downloaded from the web tier can include an embedded applet.
An applet is a small client application written in the Java programming
language that executes in the Java VM installed in the web browser. However,
client systems will likely need Java Plug-in and possibly a security policy file
so the applet can successfully execute in the web browser.
Applets that run in other network-based systems such as handheld devices
or car phones can render Wireless Markup Language (WML) pages generated
by a JSP page or servlet running on the Java EE server. The WML page is
delivered over Wireless Application Protocol (WAP) and the network
configuration requires a gateway to translate WAP to HTTP and back again.
The gateway translates the WAP request coming from the handheld device to
an HTTP request for the Java EE server, and then translates the HTTP server
response and WML page to a WAP server response and WML page for
display on the handheld device.
10. Container Types
The deployment process installs Java EE application
components in the following types of Java EE containers. The
Java EE components and container addressed in this tutorial
are shown in Figure 5.
1. An Enterprise JavaBeans (EJB) container manages the
execution of all enterprise beans for one Java EE
application. Enterprise beans and their container run on the
Java EE server.
2. A web container manages the execution of all JSP page
and servlet components for one Java EE application. Web
components and their container run on the Java EE server.
3. An application client container manages the execution of
all application client components for one Java EE
application. Application clients and their container run on
the client machine.
4. An applet container is the web browser and Java Plug-in
combination running on the client machine.
12. Scripts
Script Description
j2ee Start and stop the Java EE server.
cloudscape Start and stop the default database.
cloudIJ Run the interactive SQL tool. This is an
unsupported tool.
j2eeadmin Add JDBC drivers, JMS destinations, and
connection factories for various
resources.
keytool Create public and private keys and
generate X509 self-signed certificates.
realmtool Import certificate files. Add Java EE users
to and remove Java EE users from the
authentication and authorization list for a
Java EE application.
13. packager Package Java EE application
components into EAR, EJB JAR,
application client JAR, and WAR files.
verifier Verify that EAR, EJB JAR, application
client JAR, and WAR files are well-formed
and comply with the Java EE
specification.
runclient Run a Java EE application client.
cleanup Remove all deployed applications from the
Java EE server.
