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Jodd Core tools and huge number of utilities.
There is a newer version: 5.3.0
// Copyright (c) 2003-present, Jodd Team (http://jodd.org)
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.

package jodd.util;

import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.LinkedHashSet;
import java.util.Set;

public class ClassPathURLs {

	/**
	 * Returns urls for the classloader
	 *
	 * @param classLoader classloader in which to find urls
	 * @return list of urls or {@code null} if not found
	 */
	public static URL[] of(ClassLoader classLoader, Class clazz) {
		if (clazz == null) {
			clazz = ClassPathURLs.class;
		}
		if (classLoader == null) {
			classLoader = clazz.getClassLoader();
		}
		final Set urls = new LinkedHashSet<>();

		while (classLoader != null) {
			if (classLoader instanceof URLClassLoader) {
				final URLClassLoader urlClassLoader = (URLClassLoader) classLoader;
				return urlClassLoader.getURLs();
			}

			final URL url = classModuleUrl(classLoader, clazz);

			if (url != null) {
				urls.add(url);
			}

			classLoader = classLoader.getParent();
		}

		return urls.toArray(new URL[0]);
	}

	private static URL classModuleUrl(final ClassLoader classLoader, final Class clazz) {
		if (clazz == null) {
			return null;
		}
		final String name = clazz.getName().replace('.', '/') + ".class";

		final URL url = classLoader.getResource(name);

		if (url == null) {
			return null;
		}

		// use root
		String urlString = url.toString();
		final int ndx = urlString.indexOf(name);
		urlString = urlString.substring(0, ndx) + urlString.substring(ndx + name.length());

		try {
			return new URL(urlString);
		} catch (final MalformedURLException ignore) {
			return null;
		}
	}

}