Posted by Gene on Jan 21, 2012; 4:08am
URL: https://forum.jogamp.org/GlueGen-tries-to-load-64-bits-libs-on-64-bits-machines-using-32-bits-JVM-tp3610342p3677251.html

I ran into this back in JOGL 1 days building an installer to pick 32- or 64-bit DLLs.  After much research I wrote the following code which has worked well on thousands of machines to date.  The project is welcome to the code and algorithm.

public class DetectJVM {

    // Add to this list any Java attribute that, if the key exists in global
    // properties, the value contains a 64 if and only if we are running a
    // 64-bit JVM, which therefore needs AMD64 format DLLs in Windows.
    private static final String keys [] = {
        "sun.arch.data.model",
        "com.ibm.vm.bitmode",
        "os.arch",
    };

    public static void main (String [] args) {
        boolean print = args.length > 0 && "-print".equals(args[0]);
        for (String key : keys) {
            String property = System.getProperty(key);
            if (print) {
                System.out.println(key + "=" + property);
            }
            if (property != null) {
                int errCode = (property.indexOf("64") >= 0) ? 64 : 32;
                if (print) {
                    System.out.println("err code=" + errCode);
                }
                System.exit(errCode);
            }
        }
    }
}