get all loaded classes from a ClassLoader

gistfile1.java

private List<Class<?>> getClasses(ClassLoader classLoader) throws ReflectiveOperationException {
    Class<?> clazz = classLoader.getClass();
    while (clazz != ClassLoader.class) {
        clazz = clazz.getSuperclass();
    }
    Field field = clazz.getDeclaredField("classes");
    field.setAccessible(true);

    return new ArrayList<Class<?>>((Collection<Class<?>>) field.get(classLoader));
}