J2EE Full Form | J2EE Ka Full Form | J2EE Meaning in English

J2EE Full Form


J2EE Stands for Java 2 Platform, Enterprise Edition, The Enterprise Java Blueprint for the J2EE Platform describes the J2EE application model and best practices for using the J2EE platform. Built on the J2SE platform, the J2EE application model provides a simplified approach to develop highly scalable and highly available Internet or intranet based applications. Thanks to the J2EE application model, perhaps the most interesting thing about J2EE applications is what they don't. Namely, the various complexities inherent in enterprise applications – transaction management, life-cycle management, resource pooling – are built into the platform and provided automatically to the components it supports. Component and application developers are free to focus on specifications such as business logic and user interface. Another advantage of the J2EE platform is that the application model encapsulates layers of functionality into specific types of components. Business logic is contained in Enterprise JavaBeans (EJB) components. Client interaction can be presented through plain HTML web pages, through web pages powered by applets, through Java servlets, or the JavaServer Pages technology, or through stand-alone Java applications. Components communicate transparently using various standards: HTML, XML, HTTP, SSL, RMI, IIOP, and others. Reusable J2EE components mean a competitive option for enterprise developers and IT organizations. The J2EE platform enables them to assemble applications by combining standard, commercially available components and their own custom components. A range of standardized J2EE functionality is available off the shelf, from general business application components to vertical market solutions. This means that an e-commerce site can be built using a combination of off-the-shelf EJB components for shopping cart behavior, EJB components modified for specific customer services, and using JavaServer Pages technology. Fully customized layouts that bring a unique look and feel. to the site. This approach means faster development time, better quality, maintainability and portability, and web services interoperability across a range of enterprise platforms. Bottom line benefits are increased programmer productivity, better strategic use of computing resources, and greater return on the organization's technology investment.

Containers and Connectors: Hiding Complexity, Enhancing Portability

The J2EE application model divides enterprise applications into three fundamental parts: components, containers, and connectors. Components are the main focus of application developers, while system vendors implement containers and connectors to hide complexity and promote portability. Containers intervene between clients and components, providing services to both transparently, including transaction support and resource pooling. Container arbitration allows multiple component behaviors to be specified at deployment time, rather than by program code. Connectors sit beneath the J2EE platform, defining a portable service API that communicates with existing enterprise vendor offerings. Connectors promote flexibility by enabling a variety of implementations of specific services. Specifically, connectors that implement pluggable messaging contracts enable bidirectional communication between J2EE components and enterprise systems.

Flexible User Interaction

The J2EE platform provides options for a graphical user interface on the company's intranet or the World Wide Web. Clients can run on desktops, laptops, PDAs, cell phones and other devices. Pure client-side user interfaces can use standard HTML and Java applets. Support for Simple HTML means quick prototyping, and support for a wide range of clients. Additionally, the J2EE platform supports automatic download of Java plug-ins, where applet support is lacking. The J2EE platform also supports stand-alone Java application clients. For server-side generation of dynamic content, the J2EE platform supports two types of web component technologies: Java Servlets and JavaServer Pages (JSP). Java Servlets enable developers to easily implement server-side behaviors that take full advantage of the power of rich Java APIs. JavaServer Pages technology combines the ubiquity of HTML with the power of server-side dynamic content creation. The JSP 2.0 specification supports static templates, simplified access to Java objects, and easy extensibility.

Enterprise JavaBeans Component Model

EJB technology gives developers the ability to model a full range of useful objects in the enterprise by defining several types of EJB components: session beans, entity beans, message-driven beans. Session beans represent the behaviors associated with client sessions -- for example, user purchase transactions on an e-commerce site. Session beans can act as web service endpoints. Entity beans represent collections of data - such as rows in a relational database - and encapsulate operations on the data they represent. Entity beans are intended to be persistent, as long as the data they are associated with remains viable. Message-driven beans allow J2EE applications to process messages asynchronously. A message-driven bean typically acts as a JMS message listener, similar to an event listener, except that it receives JMS messages instead of events. Messages can be sent by any J2EE component – ​​an application client, another enterprise bean, or a web component – ​​or by a JMS application or system that does not use J2EE technology.