src/main/java/com/fizzed/jne/JNE.java
synchronized static public File requireFile(String name, Options options) throws IOException {
        File file = findFile(name, options);
        if (file == null) {
            throw new ResourceNotFoundException("Resource file " + name + " not found");
        }
        return file;
    }
synchronized static public File requireFile(String name, Options options) throws IOException {
        File file = findFile(name, options);
        if (file == null) {
            throw new ResourceNotFoundException("Resource file " + name + " not found");
        }
        return file;
    }
Same as findFile but throws an exception if the file was not found.