Setting up Java
From Exilent
Exilent currently supports only Java version 8.
If you install a new Java version on your computer it is possible that it doesnt get set as default so an older version of Java would be still the default Java runner. So when you double click a JAR file it would be executed on this version of Java.
In order to run Exilent you have to make sure you have Java 8 set as default.
Verify your default Java version
Open up a terminal where you can type commands (Windows: Start - Command Prompt, Mac: Finder - Terminal).
Type: java -version
The default Java version will be printed out (Java 8 181).