The method 
    public void log(final int level, final Object obj1,
                    final Throwable exception)
    {
        log(level , obj1, exception);
    }

recursively calls itself.  I suppose the exception should be PrintStackTrace()d 
together with the obj1.toString()
As I am using commons, I would like to see this interface extended with log
(final int level, final Throwable exception)