The J2EE platform is available for free from JavaSoft. However, there are dependencies you need to be aware of before installation. These are described in the warning below.
The J2EE reference implementation requires the JDK1.2.2 release or later to work correctly.
If you don't have JDK 1.2.2 already on your system, you will need to download and install it before the J2EE platform will work.
In the following discussion, I will use <J2EE_HOME> and <JAVA_HOME> to represent the directories in which you installed the J2EE reference implementation and the JDK. As the Java software is continually being upgraded, please make sure you follow the instructions on the JavaSoft Web site so that you download the latest versions for the J2EE SDK and the 4 Java 2 Standard edition JDK.

In the exercise that follows, you will download the reference implementation from the JavaSoft Web site. Download J2EE Reference Platform - Exercise
In the next lesson, you will configure the software you just downloaded.