Additionally, the J2EE platform supports automatic download of the Java Plug-in to add applet support where it's lacking. Support for simple HTML means quicker prototypes, and support for a broader range of clients. Pure client-side user interfaces can use standard HTML and Java applets. Clients can run on desktops, laptops, PDAs, cell phones, and other devices. The J2EE platform provides choices for graphical user interfaces across a company's intranet or on the World Wide Web. In particular, connectors implementing pluggable messaging contracts enable bidirectional communication between J2EE components and enterprise systems. Connectors promote flexibility by enabling a variety of implementations of specific services. #VIDEO2BRAIN JAVA ENTERPRISE EDITION PORTABLE#Container mediation allows many component behaviors to be specified at deployment time, rather than in program code.Ĭonnectors sit beneath the J2EE platform, defining a portable service API that communicates with existing enterprise vendor offerings. Components are the key focus of application developers, while system vendors implement containers and connectors to conceal complexity and promote portability.Ĭontainers intercede between clients and components, providing services transparently to both, including transaction support and resource pooling. The J2EE application model divides enterprise applications into three fundamental parts: components, containers, and connectors. Containers and Connectors: Hiding Complexity, Enhancing Portability The bottom line benefits are increased programmer productivity, better strategic use of computing resources, and greater return on an organization's technology investments. This approach means faster development time, better quality, maintainability and portability, and Web services interoperability across a range of enterprise platforms. This means that an e-commerce site could be built using a combination of off-the-shelf EJB components for shopping cart behaviors, modified EJB components for specialized customer services, and completely customized layouts using JavaServer Pages technology that bring a unique look and feel to the site. From general business application components to vertical market solutions, a range of standardized J2EE functionality is available off the shelf. The J2EE platform enables them to assemble applications from a combination of standard, commercially available components and their own custom components. Reusable J2EE components mean competitive choices for enterprise developers and IT organizations. Components communicate transparently using various standards: HTML, XML, HTTP, SSL, RMI, IIOP, and others. Client interaction can be presented through plain HTML web pages, through web pages powered by applets, Java Servlets, or JavaServer Pages technology, or through stand-alone Java applications. Business logic is encapsulated in Enterprise JavaBeans (EJB) components. #VIDEO2BRAIN JAVA ENTERPRISE EDITION FREE#Component and application developers are free to focus on specifics such as business logic and user interfaces.Īnother advantage of the J2EE platform is that the application model encapsulates the layers of functionality in specific types of components. That is, 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. Thanks to the J2EE application model, maybe the most interesting thing about J2EE applications is what they don't do. Building on the J2SE platform, the J2EE application model provides a simplified approach to developing highly scalable and highly available internet or intranet based applications. The Enterprise Java BluePrints for the J2EE platform describe the J2EE application model and best practices for using the J2EE platform. Containers and Connectors: Hiding Complexity, Enhancing Portability.Java 2 Platform, Enterprise Edition (J2EE) Overview Contents
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