import java.net.*; import java.lang.reflect.*; public class TestLeak { class MyLoader extends URLClassLoader { public MyLoader (URL urls[]) { super (urls); } } public static void main (String[] args) { URLClassLoader ucl = (URLClassLoader) ClassLoader.getSystemClassLoader(); URL urls[] = ucl.getURLs (); Class ifaces[] = new Class[1]; ifaces[0] = java.lang.Comparable.class; try { for (int i = 0; i < 100; i++) { Proxy.getProxyClass (new MyLoader (urls), ifaces); } } catch (Exception e) { e.printStackTrace (); } } }