AddUrlToClassPath

/**
 * Dynamically add folder to class search path (so called classpath).
 */

package com.google.gwt.dist.util;

import java.io.File;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.logging.Level;
import java.util.logging.Logger;

public class Util {

	@SuppressWarnings("unchecked")
	private static final Class[] parameters = new Class[] { URL.class };
	private static final Logger logger = Logger.getLogger(Util.class.getName());

	/**
	 * This method adds a folder to class search path at runtime.
	 * 
	 * @param u
	 *            URL of the folder to be added to class search path.
	 */
	public static void addUrl(URL u) {
		URLClassLoader sysloader = (URLClassLoader) ClassLoader
				.getSystemClassLoader();
		Class<URLClassLoader> sysclass = URLClassLoader.class;

		try {
			Method method = sysclass.getDeclaredMethod("addURL", parameters);
			method.setAccessible(true);
			method.invoke(sysloader, new Object[] { u });
		} catch (NoSuchMethodException e) {
			logger.log(Level.SEVERE, e.getMessage());
		} catch (InvocationTargetException e) {	
			logger.log(Level.SEVERE, e.getMessage());
		} catch (IllegalAccessException e) {
			logger.log(Level.SEVERE, e.getMessage());
		}
	}
}