/**
* Load properties into the given instance.
* @param props the Properties instance to load into
* @throws IOException in case of I/O errors
* @see #setLocations
*/
protected void loadProperties(Properties props) throws IOException {
    if (this.locations != null) {
        for (Resource location : this.locations) {
            if (logger.isDebugEnabled()) {
                logger.debug("Loading properties file from " + location);
            }
            try {
                PropertiesLoaderUtils.fillProperties(
                        props, new EncodedResource(location, this.fileEncoding), this.propertiesPersister);
            }
            catch (IOException ex) {
                // Resource not found when trying to open it
                if (this.ignoreResourceNotFound &&
                        (ex instanceof FileNotFoundException || ex instanceof UnknownHostException)) {
                    if (logger.isInfoEnabled()) {
                        logger.info("Properties resource not found: " + ex.getMessage());
                    }
                }
                else {
                    throw ex;
                }
            }
        }
    }
}