tailieunhanh - WebSphere Studio Application Developer Version 5 Programming Guide part 41

WebSphere Studio Application Developer part 41 provides integrated development tools for all e-business development roles, including Web developers, Java developers, business analysts, architects, and enterprise programmers. The customizable, targeted, role-based approach of WebSphere Studio Application Developer will be characteristic of all new products built on the WebSphere Studio Workbench. It is well integrated with WebSphere Application Server and provides built-in server test environments that can be used for testing and profiling Web applications | Introduction Enterprise JavaBeans EJB is an architecture for server-side component-based distributed enterprise applications written in Java. Since its introduction a few years ago the technology has gained momentum among platform providers and enterprise development teams. This is because the EJB component model simplifies the development of business components that are Secure Certain types of applications have security restrictions that have previously made them difficult to implement in Java. For example certain insurance applications must restrict access to patient data in order to meet regulatory guidelines. Until the advent of enterprise beans there was no way to restrict access to an object or method by a particular user. Previously restricting access at the database level and then catching errors thrown at the JDBC level or by restricting access at the application level by custom security code would have been the only implementation options. However enterprise beans now allow method-level security on any enterprise bean or method. Users and user groups can be created which can be granted or denied execution rights to any EJB or method. In WebSphere these same user groups can be granted or denied access to Web resources servlets JSPs and HTML pages and the user IDs can be in a seamless way passed from the Web resources to the EJBs by the underlying security framework. Not only that but the authenticated credentials may also be forwarded to other systems possibly legacy systems compatible LTPA clients . Distributed Enterprise JavaBeans automatically provide distribution capabilities to your application allowing for the building of enterprise-scale systems. In short this means that your system s modules can be deployed to many different physical machines and many separate OS processes to achieve your performance scalability and availability requirements. Better yet you may start small with just a single process and grow to as many different machines as you .