jar:<url>!/{entry} import java.net.MalformedURLException; import java.net.URL; import java.net.URLClassLoader; class URLClassLoaderSample { public static void main(String[] args) { try { URL[] urls = new URL[1]; urls[0] = new URL("jar:file://home/hoge/jdbc.jar!/"); ClassLoader parent = ClassLoader.getSystemClassLoader(); URLClassLoader urlClazzloader = new URLClassLoader(urls, parent); Class clazz