The business layer is where you typically write code to handle the business logic of your application. Requests to this layer could come from the presentation layer, directly from the client application, or from the middle layer consisting of, but not limited to, web services. Classes in this layer are executed in the application container part of JEE server. GlassFish and WebSphere are examples of web container plus application container.

Let us take a tour of some of the specifications in this group.