• J2EE: is an architecture to define standards to solve enterprise level problems, like persistence, scalability, availability, security, distributed computing, etc. This standard should be followed by application server vendors, so a J2EE application would run on any J2EE application server complaint, like Oracle OC4J (OAS), IBM WebSphere, BEA WebLogic, JBoss, etc. It is not a simple architecture to solve a simple problem. Get ready to study and understand the complexity of enterprise programming (we will deal with this matter on others papers to help you).
• EJB: is a J2EE standard to define components to write business logic at the server side (Session Beans), to define a domain layer to access data (Entity Beans) and to deal with asynchronous and queuing messages (Message Driven Beans). The last EJB standard release (the 3.0), not commonly used yet, became much easier to develop with. The previous one (the 2.0 and 2.1) should be used with a series of design patterns to solve common problems, what make the code not so easy to program and understand. The first one (the 1.0 and 1.1) was useless to enterprise level development; it did not implement even a one to many relationship.
• Oracle ADF: according to Oracle, ADF is an application development framework design to simplify J2EE development and bring productivity and ease of use of Oracle forms to the J2EE platform. ADF with JDeveloper is the best choice for Oracle E-Business Suite, because Oracle made this environment familiar to Oracle Forms, Reports and Designer developers.
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