protected void warn(final Logger logger, final String template, final Object... args) {
        final String msg = LogUtil.message(template, args);
        logger.warn(msg);
        System.out.println(msg);
    }
Log to logger as WARN and stdout

@param template The message template with '{}' placeholders
@param args     The args for the template
stroom-app/src/main/java/stroom/app/commands/AbstractStroomBaseCommand.java