Reviewing the software system architecture, layers of an application are separated logic parts that belong to the application. The same layers stands also in the J2EE Application. The description of layers, now taking into consideration the web components from J2EE platform, is presented below:
o Presentation layer: This layer is made up of Java Server Pages (JSP) which are basically HTML files with special tags having Java codes to provide dynamic content to the clients. Java Server Pages run on a Web server in a JSP servlet engine. JSP codes the presentation logic and takes care of client HTTP sessions, which contains the information about clients sending requests to the Web server.
o Business logic layer: JavaBeans are the core of Business Logic Layer. JavaBeans bring component technology to the Java platform. With the JavaBeans API, one can create reusable, platform-independent components. The purpose of JavaBeans in our architecture is to code business logic in them. Business logic is the implementation of various processes of an enterprise. Nevertheless, the Business Logic is included also in stored procedures in Data Base servers
