Difference between configuring log4j using configure and doConfigure

While searching for a way to reload the logging configuration for log4j I realized that in our current code we were using:

input = new FileInputStream(newFileName);
new DOMConfigurator().doConfigure(input,LogManager.getLoggerRepository());

To read the configuration file during startup of our webapplication.

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Looking at the API I see the method configure (and also configureAndWatch, which is what I want to do). What is the difference between using the above compared to:

DOMConfigurator.configure(newFileName);

Edit: Note that newFileName is a String with the path to the file.

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The configure method just creates a new DomConfigurator instance and calls doConfigure on it:

public static void configure (Element element) {
DOMConfigurator configurator = new DOMConfigurator();
configurator.doConfigure(element,  LogManager.getLoggerRepository());

}

The source code for DomConfigurator can e.g. be found at Docjar