it = configs.iterator();
List cfgs = (List) configs.get(configClazz); it = cfgs.iterator();
    public TestConfig getConfig(Class clazz, String testName)    {        TestKey key = new TestKey(clazz, testName);        Iterator it = (Iterator) iterators.get(key);        if(it == null)        {            it = configs.iterator();            iterators.put(key, it);        }                TestConfig cfg = (TestConfig) it.next();        return cfg;    }