Add jars to the classpath at runtime!

ClasspathHacker.java

import java.io.File;
import java.lang.reflect.Method;
import java.net.URL;
import java.net.URLClassLoader;

/**
 * 
 * @author apemanzilla
 *
 */
public final class ClasspathHacker {
	/**
	 * Hacks the system classloader to add a classpath entry at runtime.<br /><br />
	 * 
	 * <b>Example</b><br /><br />
	 * {@code ClasspathHacker.addToClasspath(new File('example.jar'));}<br />
	 * {@code ClassInExampleJar.doStuff();}
	 * 
	 * @param file The jar file to add to the classpath
	 */
	public static void addToClasspath(File file) {
		try {
			URL url = file.toURI().toURL();

			URLClassLoader classLoader = (URLClassLoader) ClassLoader.getSystemClassLoader();
			Method method = URLClassLoader.class.getDeclaredMethod("addURL", URL.class);
			method.setAccessible(true);
			method.invoke(classLoader, url);
		} catch (Exception e) {
			throw new RuntimeException("Unexpected exception", e);
		}
	}
}