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OVERVIEW
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Figure 1 2 Server Communications
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J2EE Web components can be either servlets or JSP pages Servlets are Java programming language classes that dynamically process requests and construct responses JSP pages are text-based documents that execute as servlets but allow a more natural approach to creating static content Static HTML pages and applets are bundled with Web components during application assembly, but are not considered Web components by the J2EE specification Server-side utility classes can also be bundled with Web components and, like HTML pages, are not considered Web components Like the client tier and as shown in Figure 1 3, the Web tier might include a JavaBeans component to manage the user input and send that input to enterprise beans running in the business tier for processing
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DISTRIBUTED MULTITIERED APPLICATIONS
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Figure 1 3 Web Tier and J2EE Application
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Business Components
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Business code, which is logic that solves or meets the needs of a particular business domain such as banking, retail, or finance, is handled by enterprise beans running in the business tier Figure 1 4 shows how an enterprise bean receives data from client programs, processes it (if necessary), and sends it to the enterprise information system tier for storage An enterprise bean also retrieves data from storage, processes it (if necessary), and sends it back to the client program
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Figure 1 4 Business and EIS Tiers
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There are three kinds of enterprise beans: session beans, entity beans, and message-driven beans A session bean represents a transient conversation with a client When the client finishes executing, the session bean and its data are gone In contrast, an entity bean represents persistent data stored in one row of a database table If the client terminates or if the server shuts down, the underlying services ensure that the entity bean data is saved A message-driven bean combines features of a session bean and a Java Message Service (JMS) message listener, allowing a business component to receive JMS messages asynchronously This tutorial describes entity beans and session beans For information on message-driven beans, see the Java Message Service Tutorial, available at
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The enterprise information system tier handles enterprise information system software and includes enterprise infrastructure systems such as enterprise resource planning (ERP), mainframe transaction processing, database systems, and other legacy information systems J2EE application components might need access to enterprise information systems for database connectivity, for example
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Normally, thin-client multitiered applications are hard to write because they involve many lines of intricate code to handle transaction and state management, multithreading, resource pooling, and other complex low-level details The component-based and platform-independent J2EE architecture makes J2EE applications easy to write because business logic is organized into reusable components In addition, the J2EE server provides underlying services in the form of a container for every component type Because you do not have to develop these services yourself, you are free to concentrate on solving the business problem at hand
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Containers are the interface between a component and the low-level platformspecific functionality that supports the component Before a Web, enterprise bean, or application client component can be executed, it must be assembled into a J2EE application and deployed into its container
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The assembly process involves specifying container settings for each component in the J2EE application and for the J2EE application itself Container settings customize the underlying support provided by the J2EE server, which includes services such as security, transaction management, Java Naming and Directory Interface (JNDI) lookups, and remote connectivity Here are some of the highlights: The J2EE security model lets you configure a Web component or enterprise bean so that system resources are accessed only by authorized users The J2EE transaction model lets you specify relationships among methods that make up a single transaction so that all methods in one transaction are treated as a single unit JNDI lookup services provide a unified interface to multiple naming and directory services in the enterprise so that application components can access naming and directory services The J2EE remote connectivity model manages low-level communications between clients and enterprise beans After an enterprise bean is created, a client invokes methods on it as if it were in the same virtual machine The fact that the J2EE architecture provides configurable services means that application components within the same J2EE application can behave differently based on where they are deployed For example, an enterprise bean can have security settings that allow it a certain level of access to database data in one production environment and another level of database access in another production environment The container also manages nonconfigurable services such as enterprise bean and servlet life cycles, database connection resource pooling, data persistence, and access to the J2EE platform APIs described in the section J2EE APIs, page (15) Although data persistence is a nonconfigurable service, the J2EE architecture lets you override container-managed persistence by including the appropriate code in your enterprise bean implementation when you want more control than the default container-managed persistence provides For example, you might use bean-managed persistence to implement your own finder (search) methods or to create a customized database cache
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