Java Utililty Methods Jar File Find

if (dir == null || !dir.isDirectory()) {
    return null;
for (File file : dir.listFiles()) {
    if (file.isDirectory()) {
        File f = findJar(file);
        if (f != null) {
            return f;
...

List<File> jars = getFiles(System.getProperty("java.class.path"));
for (File jar : jars) {
    if (jar.getName().matches(nameRegexp)) {
        return jar;
return null;

URLClassLoader cl = (URLClassLoader) c.getClassLoader();
String cn = c.getCanonicalName();
URL url = cl.findResource(cn.replace(".", "/") + ".class");
String s = url.getFile().substring(url.getProtocol().length() + 2);
String jar = s.substring(0, s.lastIndexOf("!"));
return new JarFile(jar);

JarEntry jarEntry = jarFile.getNextJarEntry();
while (jarEntry != null) {
    if (jarEntry.getName().equals(entryName)) {
        break;
    } else {
        jarEntry = jarFile.getNextJarEntry();
return jarEntry;

Set<String> jars = new HashSet<String>();
for (String locationsLine : classPathLines) {
    if (locationsLine == null)
        continue;
    for (String CPentry : locationsLine.split(":")) {
        if (CPentry.endsWith(".jar"))
            jars.add(new File(CPentry).getAbsoluteFile().toString());
return jars.toArray(new String[0]);

List<File> result = new ArrayList<File>();
File[] plugins = folder.listFiles();
if (null != plugins) {
    for (File f : plugins) {
        if (f.getName().endsWith(".jar")) {
            result.add(f);
System.out.println("JARS found: " + result.toString());
return result;

File[] jarFiles = new File[0];
if (libDir.isDirectory()) {
    jarFiles = libDir.listFiles(JAR_FILES_FILTER);
return jarFiles;

File libdir;
if (new File(sparkHome, "RELEASE").isFile()) {
    libdir = new File(sparkHome, "jars");
    checkState(!failIfNotFound || libdir.isDirectory(), "Library directory '%s' does not exist.",
            libdir.getAbsolutePath());
} else {
    libdir = new File(sparkHome, String.format("assembly/target/scala-%s/jars", scalaVersion));
    if (!libdir.isDirectory()) {
...

File[] files = targetDirectory.listFiles();
URL[] urls = new URL[files.length];
for (int i = 0; i < files.length; i++) {
    if (files[i].getName().endsWith(".jar")) {
        try {
            urls[i] = files[i].toURI().toURL();
        } catch (MalformedURLException e) {
            e.printStackTrace();
...

File[] jarArray = new File(path).listFiles(new FilenameFilter() {
    @Override
    public boolean accept(File dir, String name) {
        return name.endsWith(".jar");
});
HashSet<String> jarNames = new HashSet<>();
for (File jar : jarArray) {
...