Java Utililty Methods Jar Zip File

String name = src.getAbsolutePath();
String prefix = baseDir.getAbsolutePath();
if (prefix.endsWith("/") || prefix.endsWith("\\")) {
    prefix = prefix.substring(0, prefix.length() - 1);
name = name.substring(prefix.length() + 1);
name = name.replace('\\', '/');
long timestamp = src.lastModified();
...

FileInputStream fin = new FileInputStream(file);
int bufSize = 1024;
byte ipBuf[] = new byte[bufSize];
int lenRead = 0;
String filename = path + file.getName();
zipStream.putNextEntry(new ZipEntry(filename));
while ((lenRead = fin.read(ipBuf)) > 0) {
    zipStream.write(ipBuf, 0, lenRead);
...

String relPath = "";
if (!fileOrDirectoryToAdd.getAbsolutePath().equals(extractedJarPath.getAbsolutePath())) {
    String fileToAddCanonicalPath = fileOrDirectoryToAdd.getCanonicalPath();
    int relStart = extractedJarPath.getCanonicalPath().length() + 1;
    int relEnd = fileOrDirectoryToAdd.getCanonicalPath().length();
    String d = fileToAddCanonicalPath.substring(relStart, relEnd);
    relPath = d.replace("\\", "/");
BufferedInputStream in = null;
try {
    if (fileOrDirectoryToAdd.isDirectory()) {
        if (!relPath.isEmpty()) {
            if (!relPath.endsWith("/")) {
                relPath += "/";
            JarEntry entry = new JarEntry(relPath);
            entry.setTime(fileOrDirectoryToAdd.lastModified());
            target.putNextEntry(entry);
            target.closeEntry();
        for (File nestedFile : fileOrDirectoryToAdd.listFiles()) {
            addFileToJar(nestedFile, extractedJarPath, target);
        return;
    JarEntry entry = new JarEntry(relPath);
    entry.setTime(fileOrDirectoryToAdd.lastModified());
    target.putNextEntry(entry);
    in = new BufferedInputStream(new FileInputStream(fileOrDirectoryToAdd));
    byte[] buffer = new byte[1024];
    while (true) {
        int count = in.read(buffer);
        if (count == -1) {
            break;
        target.write(buffer, 0, count);
    target.closeEntry();
} finally {
    if (in != null) {
        in.close();

byte[] buffer = new byte[8192];
JarEntry entry = new JarEntry(path);
jar.putNextEntry(entry);
int n;
while ((n = file.read(buffer)) > 0) {
    jar.write(buffer, 0, n);

try {
    Method method = URLClassLoader.class.getDeclaredMethod("addURL", new Class[] { URL.class });
    method.setAccessible(true);
    method.invoke(classLoader(), new Object[] { path.toURL() });
} catch (Throwable e) {
    throw new RuntimeException(String.format("Error adding %s to classpath", path), e);

URLClassLoader classLoader = (URLClassLoader) classLoaderMakedObject.getClass().getClassLoader();
@SuppressWarnings("rawtypes")
Class classClassLoader = URLClassLoader.class;
Method methodAddUrl = classClassLoader.getDeclaredMethod("addURL", URL.class);
methodAddUrl.setAccessible(true);
methodAddUrl.invoke(classLoader, jarPath.toURI().toURL());

URLClassLoader classLoader = (URLClassLoader) ClassLoader.getSystemClassLoader();
@SuppressWarnings("rawtypes")
Class classClassLoader = URLClassLoader.class;
Method methodAddUrl = classClassLoader.getDeclaredMethod("addURL", URL.class);
methodAddUrl.setAccessible(true);
methodAddUrl.invoke(classLoader, jarPath.toURI().toURL());

if (dir.exists() && dir.isDirectory()) {
    File[] files = dir.listFiles();
    for (File file : files) {
        if (file.isFile()) {
            if (file.getName().toLowerCase().endsWith(".jar") && !addFile(file)) {
                System.out.println("Unable to add " + file + " to the classpath.");
        } else if (file.isDirectory())
...

return addJars(directory, recursive, null);

if (jarPath != null) {
    File f = new File(jarPath);
    try {
        URL u = f.toURI().toURL();
        URLClassLoader urlClassLoader = (URLClassLoader) ClassLoader.getSystemClassLoader();
        Class<?> urlClass = URLClassLoader.class;
        Method method = urlClass.getDeclaredMethod("addURL", new Class[] { URL.class });
        method.setAccessible(true);
...