Java Utililty Methods Class Find

packageName = packageName.replace('.', '/');
List<String> classes = new ArrayList<>();
URL[] urls = ((URLClassLoader) cl).getURLs();
for (URL url : urls) {
    File jar = new File(url.getFile());
    if (jar.isDirectory()) {
        File subdir = new File(jar, packageName);
        if (!subdir.exists())
...

ArrayList<Class> classes = new ArrayList<Class>();
File directory = null;
try {
    ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
    if (classLoader == null)
        throw new ClassNotFoundException("Can't get class loader.");
    String path = '/' + packageName.replace('.', '/');
    URL resource = classLoader.getResource(path);
...

ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
assert classLoader != null;
String path = packageName.replace('.', '/');
Enumeration<URL> resources = classLoader.getResources(path);
List<File> dirs = new ArrayList<File>();
while (resources.hasMoreElements()) {
    URL resource = resources.nextElement();
    dirs.add(new File(resource.getFile()));
...

Collection<Class<?>> allClasses = new ArrayList<Class<?>>();
for (String packageName : packageNames) {
    allClasses.addAll(getAllClassesIn(packageName));
return allClasses;

ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
String path = packageName.replace('.', '/');
Enumeration<URL> resources = classLoader.getResources(path);
List<String> dirs = new ArrayList<String>();
while (resources.hasMoreElements()) {
    URL resource = resources.nextElement();
    dirs.add(URLDecoder.decode(resource.getFile(), "UTF-8"));
TreeSet<String> classes = new TreeSet<String>();
for (String directory : dirs) {
    classes.addAll(findClasses(directory, packageName));
ArrayList<Class<?>> classList = new ArrayList<Class<?>>();
for (String clazz : classes) {
    classList.add(Class.forName(clazz));
return classList;

if (clazz == null) {
    return new Class[0];
return getClasses(getPackageName(clazz));

String pk = cls.getPackage().getName();
String path = pk.replace('.', '/');
ClassLoader classloader = Thread.currentThread().getContextClassLoader();
URL url = classloader.getResource(path);
return getClasses(new File(url.getFile()), pk);

String dottedPackage = pack.replaceAll("[/]", ".");
List<Class> classes = new ArrayList<Class>();
URL upackage = cl.getResource(pack);
DataInputStream dis = new DataInputStream((InputStream) upackage.getContent());
String line = null;
while ((line = dis.readLine()) != null) {
    if (line.endsWith(".class")) {
        try {
...

final ClassLoader loader = Thread.currentThread().getContextClassLoader();
return getClasses(loader, packageName);

final List<Class<?>> classes = getClasses(packageName);
final List<Class<?>> annotatedClasses = new LinkedList<Class<?>>();
for (Class<?> clazz : classes) {
    if (clazz.isAnnotationPresent(annotation)) {
        annotatedClasses.add(clazz);
return annotatedClasses;
...