#vulnerable code 
                                URI newURI(String spec) throws URISyntaxException {
        String expanded = expand(spec);
        if (expanded.startsWith(CLASSPATH_PROTOCOL)) {
            String path = expanded.substring(CLASSPATH_PROTOCOL.length());
            URL url = classLoader.getResource(path);
            if (url == null)
                return null;
            return url.toURI();
        } else {
            return new URI(expanded);
        }
    } 
                            #location 3 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                ConfigURIFactory(ClassLoader classLoader, VariablesExpander expander) {
        this.classLoader = classLoader;
        this.expander = expander;
    }