Make my own web site - Overview 13 Cross-platform. Java runs on any
Overview 13 Cross-platform. Java runs on any platform. Since EJB is an application of Java, this means EJB should also easily run on any platform. This is valuable for customers who have invested in a variety of powerful hardware, such as Win32, UNIX, and mainframes. They do not want to throw away these investments. If you don t want to go the EJB route, you have two other choices: Lightweight open source Java frameworks such as Spring. In Chapter 11 we discuss when to use EJB versus such non-standard frameworks. Microsoft .NET managed components, part of the Microsoft .NET platform EJB as a Business Tier Component The real difference between presentation tier components such as thick clients, dynamically generated Web pages, or Web Service clients and enterprise beans is the domain in which they operate. Presentation components are well suited to handle client-side operations, such as rendering GUIs, executing client-side validations, constructing appropriate SOAP messages to send them to Web Service, and so on. They deal directly with the end user or business partner. Enterprise beans, on the other hand, are not intended for the client side; they are server-side components. They are meant to perform server-side operations, such as executing complex algorithms or performing high-volume business transactions. The server side has different kinds of needs than GUI clients do. Server-side components need to run in a highly available (24/7), fault-tolerant, transactional, and multiuser secure environment. The application server provides this high-end server-side environment for the enterprise beans, and it provides the runtime containment necessary to manage enterprise beans. Specifically, EJB is used to help write logic that solves business problems. Typically, EJB components (enterprise beans) can perform any of the following tasks: Perform business logic. Examples include computing the taxes on the shopping cart, ensuring that the manager has authority to approve the purchase order, or sending an order confirmation e-mail using the Java- Mail API. Access a database. Examples include submitting an order for books, transferring money between two bank accounts, or calling a stored procedure to retrieve a trouble ticket in a customer support system. Enterprise beans can achieve database access using the Java Database Connectivity (JDBC) API.
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