import java.io.*;

import java.lang.ref.Reference;

import java.lang.ref.ReferenceQueue;

import java.lang.ref.WeakReference;

import java.lang.reflect.Constructor;

import java.net.URL;

import java.net.URLClassLoader;

public class SubclassGC {

private static final long TIMEOUT = 1000;

public static final void main(String[] args) throws Exception {

System.err.println("\n Regression test for bug 6232010\n");

if (System.getSecurityManager() == null) {

System.setSecurityManager(new SecurityManager());

}

ClassLoader systemLoader = ClassLoader.getSystemClassLoader();

ClassLoader loader = new URLClassLoader(((URLClassLoader) systemLoader).getURLs(),

systemLoader.getParent());

Class<? extends ObjectOutputStream> cl =

Class.forName(SubclassOfOOS.class.getName(), false,

loader).asSubclass(ObjectOutputStream.class);

Constructor<? extends ObjectOutputStream> cons =

cl.getConstructor(OutputStream.class);

OutputStream os = new ByteArrayOutputStream();

ObjectOutputStream obj = cons.newInstance(os);

final ReferenceQueue<Class<?>> queue = new ReferenceQueue<Class<?>>();

WeakReference<Class<?>> ref = new WeakReference<Class<?>>(cl, queue);

cl = null;

obj = null;

loader = null;

cons = null;

systemLoader = null;

System.err.println("\nStart Garbage Collection right now");

System.gc();

Reference<? extends Class<?>> dequeued = queue.remove(TIMEOUT);

if (dequeued == ref) {

System.err.println("\nTEST PASSED");

} else {

throw new Error();

}

}

}