Which implementation of SAXParserFactory is used?

I am dealing with xml pasring. When I check code for SAXParserFactory, I see

public static SAXParserFactory newInstance() {
    try {
        return (SAXParserFactory) FactoryFinder.find(
            /* The default property name according to the JAXP spec */
            "javax.xml.parsers.SAXParserFactory",
            /* The fallback implementation class name */
            "com.sun.org.apache.xerces.internal.jaxp.SAXParserFactoryImpl");
    } catch (FactoryFinder.ConfigurationError e) {
        throw new FactoryConfigurationError(e.getException(),
                                            e.getMessage());
    }
}

I am wondering which implementation of SAXParserFactory is actually returned? How can I check which implementation am I dealing with? Thanks in advance