public static Ini loadDefaultClassPathIni() {
        Ini ini = null;
        if (ResourceUtils.resourceExists(DEFAULT_INI_RESOURCE_PATH)) {
            LOGGER.debug("Found shiro.ini at the root of the classpath.");
            ini = new Ini();
            ini.loadFromPath(DEFAULT_INI_RESOURCE_PATH);
            if (CollectionUtils.isEmpty(ini)) {
                LOGGER.warn("shiro.ini found at the root of the classpath, but it did not contain any data.");
            }
        }
        return ini;
    }
Returns a new Ini instance created from the default {@code classpath:shiro.ini} file, or {@code null} if
the file does not exist.

@return a new Ini instance created from the default {@code classpath:shiro.ini} file, or {@code null} if
the file does not exist.
core/src/main/java/org/apache/shiro/ini/IniFactorySupport.java