How to check JRE version prior to launch?

Question

What\'s the best way to determine if the version of the JRE installed on a machine is high enough for the application which the user wants to run? Is there a way of doing it

Answer 1

Have a launching class compiled for Java 1.2 which invokes the real main() in your 1.6 classes. If an unsupported class exception is thrown them catch it and display a nice error message.