Java Utililty Methods Class Loader

List<URL> urls = new ArrayList<URL>();
File file;
if (entries != null) {
    for (String classPathEntry : entries) {
        file = new File(classPathEntry);
        if (!file.exists()) {
            throw new RuntimeException(classPathEntry); 
        try {
            urls.add(file.toURI().toURL());
        } catch (MalformedURLException e) {
            throw new RuntimeException(classPathEntry); 
ClassLoader parent = Thread.currentThread().getContextClassLoader();
URLClassLoader ucl = new URLClassLoader(urls.toArray(new URL[urls.size()]), parent);
return ucl;

URL url = Thread.currentThread().getContextClassLoader().getResource(fileName);
File file = null;
if (url != null) {
    file = new File(url.getFile());
return file;

_file = _file != null ? _file : getPackageFolder(packageName, classLoader);
if (_file != null) {
    File[] files = _file.listFiles();
    for (File file : files) {
        if (file.isDirectory()) {
            if (!file.getName().contains("."))
                getFilesByPackgeName(packageName + '.' + file.getName(), _file, classLoader, list);
        } else
...

return (URLClassLoader) getAppClassLoader().getParent();

try {
    return new File(clazz.getProtectionDomain().getCodeSource().getLocation().toURI().getPath());
} catch (URISyntaxException e) {
    return null;

try {
    Enumeration resources = cl.getResources("META-INF/MANIFEST.MF");
    while (resources.hasMoreElements()) {
        Manifest manifest = new Manifest(((URL) resources.nextElement()).openStream());
        Attributes attributes = manifest.getMainAttributes();
        if (attributes != null && extension.equals(attributes.getValue(Attributes.Name.EXTENSION_NAME))) {
            return manifest;
} catch (IOException ex) {
    throw new RuntimeException("Unable to read manifest.", ex);
return null;

Enumeration<URL> resources = classLoader.getResources(packageName.replace('.', '/'));
if (resources.hasMoreElements())
    return new File(resources.nextElement().getFile());
return null;

return (URLClassLoader) ClassLoader.getSystemClassLoader();

IClasspathEntry[] entries = javaProject.getResolvedClasspath(true);
String wsPath = javaProject.getProject().getLocation().toPortableString();
String firstEntryLocation = javaProject.getPath().toPortableString();
int idx = wsPath.indexOf(firstEntryLocation);
URL[] urls = null;
int i = 0;
String output = javaProject.getOutputLocation().toPortableString();
urls = new URL[entries.length + 1];
...

IProject project = javaProject.getProject();
IWorkspaceRoot root = project.getWorkspace().getRoot();
List<URL> urls = new ArrayList<>();
urls.add(
        new File(project.getLocation() + "/" + javaProject.getOutputLocation().removeFirstSegments(1) + "/") 
                .toURI().toURL());
for (IClasspathEntry classpathEntry : javaProject.getResolvedClasspath(true)) {
    if (classpathEntry.getEntryKind() == IClasspathEntry.CPE_PROJECT) {
...