
JDK: Java Development Kit (needed to develop Java software, includes the JRE).JRE: Java Runtime Environment (needed to run Java software).When choosing which Java to install, if you only want to run Java programs and applets, get the JRE (Java Runtime Environment) if you want to develop Java software, get the JDK (Java Development Kit). We are currently recommending Java 7 (also referred to as Java 1.7) or later. The Canadian Astronomy Data Centre using a self-generated developer certificate (not created by aĬertificate Authority) you need to accept the certificate in order to run the software.

Some filesystem-related permissions, and the amount of memory Java is allowed to use. The application checks some system properties (like which version of Java is being used),
