The Java compiler that is compatible with WebSphere Business Integration Adapters is included in the Sun Java Development Kit (JDK) and is required only if you plan to develop custom Java connectors. JDK 1.3.1_06 components are located at: http://java.sun.com/j2se/1.3/.
During the installation process, be sure to select the Program Files from the Install checklist. This is where the compiler is located.
If you are having trouble, confirm that your system variables include the
correct path to the JDK. The path should point to the directory where
the JDK is located, for example,
C:\jdk1.3.1\bin. Go to the following
location for instructions on updating the path:
http://java.sun.com/products/j2se/1.3/install-windows.html.