public class VarianceLongueurLignesDriver
    extends Configured implements Tool
{
    public static void main(String[] args) throws Exception
    {
        // préparer et lancer un job
        VarianceLongueurLignesDriver driver =
                new VarianceLongueurLignesDriver();
        int exitCode = ToolRunner.run(driver, args);
        System.exit(exitCode);
    }