Introduction to J2EE
Java is simple and most preferred object-oriented programming language among the software developers. Privacy, platform independence and safety are the major advantages of the Java language among many other advantages. This programming language can be categorized into 3 modules namely core Java, advanced Java and J2EE. The Core Java and advanced Java are standard editions, where J2EE is an enterprise edition. J2EE is the extended versions of Java Standard Edition. J2EE is portable and scalable for creating enterprise applications. A J2EE platform is mostly used for developing enterprise applications when compared to J2SE. For designing interactive application with JAVA, developers need to know about the basic concepts of Java, SQL, XML, JDBC and Model View Controller (MVC) architecture.
The J2EE platform has some unique specifications which are Java Server Page, Enterprise JavaBeans, Servlets, Connectors and several web server technologies. So, this platform is mainly used for developing, deploying, building web-based enterprise applications such as enterprise server, the platform provides an API and runtime environment. The J2EE APIs includes several technologies and extended functionalities of Java Platform Standard Edition. This platform contains a set of services, protocols and APIs that provide several functionalities for developing multi-tier web applications. At the client side J2EE supports only pure HTML and Java applets and in the server side, JSP and servlets are used. Java servlet API also has all features of the graphical user interface.
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Features of J2EE
Java uses ODBC connectivity for database applications but J2EE uses JDBC connectivity, it is the major advantage of J2EE. Initially, Java uses two-tier architecture and it is mainly used for client-server applications but it is not scalable and not suited for internet applications. But J2EE supports multi-tier architecture this architecture is used for implementing enterprise applications using Java and internet technology and the application server is used to enable the development of multi-tiered applications. This application server act as an interface between the client browser, web server and database. Multi-tier architecture also supports the development of a variety of applications like client-server application, large-scale internet applications and also support system running on intranet application.
Enterprise Javabean is one of the components of J2EE and it is referred as EJBs. This enterprise Javabeans architecture is mainly used for creating distributed business application. EJB contains entity beans and session beans. Entity beans represent different types of business entity and application logics. Session beens perform individual client-server work and it is used for encapsulating the business logic. J2EE is fully based on Java but it includes some additional larger set of libraries than J2SE.