JEE is a collection of many of the Java Community Process (https://www.jcp.org) programs. Currently, JEE is in Version 8. However, different specifications of JEE are at their own different versions.
JEE specifications can be broadly classified into the following groups:
- Presentation layer
- Business layer
- Enterprise integration layer
Note that JEE specification does not necessarily classify APIs in the preceding broad groups, but such classification could help in better understanding the purpose of the different specifications and APIs in JEE.
Before we see APIs in each of these categories, let's understand a typical JEE web application flow, as shown in the following diagram, and where each of the preceding layers fits in:
Figure 1.1: ...
