Java Utililty Methods ClassPath

List of utility methods to do ClassPath

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Description

The list of methods to do ClassPath are organized into topic(s).

Method

SetfindClasspathsByLoader(ClassLoader loader)
find Classpaths By Loader 
Set<URL> urls = new HashSet<URL>();
if (loader instanceof URLClassLoader) {
    URLClassLoader urlLoader = (URLClassLoader) loader;
    urls.addAll(Arrays.asList(urlLoader.getURLs()));
} else {
    Enumeration<URL> urlEnum;
    try {
        urlEnum = loader.getResources("");
...
EnumerationfindClassPathsToEn()
find Class Paths To En 
List<URL> urls = findClassPaths();
final Iterator<URL> iterator = urls.iterator();
return new Enumeration<URL>() {
    @Override
    public boolean hasMoreElements() {
        return iterator.hasNext();
    @Override
...
StringfindDirectoryFromClasspath(Class cls, String file)
Determine a directory's real path from the classpath. 
URL rootMarker = cls.getResource(file);
String markerPath = rootMarker.getPath();
File markerFile = new File(markerPath);
return markerFile.getParentFile().getAbsolutePath() + "/";
URLfindResourceOnClasspath(String resourceName)
Looks for a resource on the classpath with the given name 
final ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
return Optional.ofNullable(classLoader.getResource(resourceName))
        .orElseThrow(() -> new IllegalArgumentException("Resource not found with name: " + resourceName));
StringgetAvailableClassPathInfo(final ClassLoader classLoader)
get Available Class Path Info 
if (!(classLoader instanceof URLClassLoader)) {
    return "-";
final URLClassLoader cl = (URLClassLoader) classLoader;
return Arrays.toString(cl.getURLs());
URL[]getBootstrapClassPath()
get Bootstrap Class Path 
return getBootstrapURLs();
ClassLoadergetDriverClassLoader(String driverClasspath)
Provides a ClassLoader suitable for loading SQL driver class. 
if (driverClasspath == null || driverClasspath.length() == 0) {
    return Thread.currentThread().getContextClassLoader();
} else {
    String pathSeparator = System.getProperty("path.separator");
    String[] elements = driverClasspath.split(pathSeparator);
    URL[] urls = new URL[elements.length];
    for (int i = 0; i < elements.length; i++) {
        urls[i] = new URL("file", "", elements[i].trim());
...
FilegetFileFromClasspath(final String fileName)
Load the resource either using current class loader or using parent class loader 
File file = null;
URL url = Thread.currentThread().getClass().getResource(fileName);
if (url != null) {
    file = new File(url.getFile());
} else {
    url = Thread.currentThread().getContextClassLoader().getResource(fileName);
    if (url != null) {
        file = new File(url.getFile());
...
FilegetFileFromClasspath(String fileName)
get File From Classpath 
URL url = Thread.currentThread().getContextClassLoader().getResource(fileName);
if (url == null)
    return null;
File file = null;
try {
    file = new File(url.toURI());
} catch (URISyntaxException e) {
    file = new File(url.getPath());
...
StringgetFileFromClasspath(String name)
get File From Classpath 
URL url = ClassLoader.getSystemResource(name);
if (url == null) {
    throw new IllegalArgumentException("Could not find " + name);
return url.getPath();