Check Java is present before installing

Question

I\'m creating an Inno Setup installer for a jar app. What I want to do right now is to check if java is present before proceeding with the install. So I only need to be sure the

Answer 1

Instead of checking for a specific version, you can use

function RegKeyExists(const RootKey: Integer; const SubKeyName: String): Boolean;

to get the subkeys of HKLM\SOFTWARE\JavaSoft\Java Runtime Environment. (Is parallel installation of different versions possible? Don't know...) You would need to do some string fiddling to check if 1.6 or higher is installed, but it would be more flexible than checking for a specific version number.