this.location = location;
        this.substitute = substitute;
    }

    public void load(Path location) throws IOException {
        try (InputStream is = Files.newInputStream(location)) {
            load(is);
        }
    }

    public void load(URL location) throws IOException {
        try (InputStream is = location.openStream()) {
            load(is);
        }

        this.location = location;
        this.substitute = substitute;
    }

    public void load(Path location) throws IOException {
        try (InputStream is = Files.newInputStream(location)) {
            load(is);
        }
    }

    public void load(URL location) throws IOException {
        try (InputStream is = location.openStream()) {
            load(is);
        }

                if (pluginXml.isFile()) {
                    pluginDescriptor = parsePluginDescriptor(
                            () -> Files.newInputStream(pluginXml.toPath()), plugin, pluginXml.getAbsolutePath());
                }
            }

            if (pluginDescriptor == null) {

     * @throws FessSystemException if the properties file cannot be parsed.
     */
    protected void parseProjectProperties(final Path propPath) {
        try (final InputStream in = Files.newInputStream(propPath)) {
            final Properties prop = new Properties();
            prop.load(in);
            version = prop.getProperty("fess.version", "0.0.0");
            final String[] values = version.split("\\.");

        if (extensionsFile != null) {
            Path extensionsPath = Path.of(extensionsFile);
            if (Files.exists(extensionsPath)) {
                try (InputStream is = Files.newInputStream(extensionsPath)) {
                    return new CoreExtensionsStaxReader()
                            .read(is, true, InputSource.of(extensionsFile))
                            .getExtensions();
                }