Before installing jConnect, you must download and install the Java Development Kit (JDK) if developing programs that use jConnect, or the Java Runtime Environment (JRE) based on your needs.
Download the current JDK/JRE from Sun’s Java Software Web site at the following URL:
http://java.sun.com/products/index.html
Download and install the JDK or JRE using the installation instructions provided.
After installing the JRE/JRE, define the JRE_HOME/JAVA_HOME environment variable to point to the JRE/JDK installation directory. See your operating system documentation for instructions.
Installing JDK/JRE