#vulnerable code 
                             @SuppressWarnings("unchecked")
	public void replaceAllItems(Map<String, List<Object>> map) {
		// make a deep copy of the map
		Map<String, List<Object>> clonedMap = (Map<String, List<Object>>) deepCopyOfMap(map);
		Iterator<?> it = clonedMap.entrySet().iterator();
		while (it.hasNext()) {
			Map.Entry<String, List<Object>> entry = (Map.Entry<String, List<Object>>) it.next();
			replaceItemValue(entry.getKey().toString(), entry.getValue());
		}
	} 
                            #location 5 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                             @SuppressWarnings("unchecked")
	public void replaceAllItems(Map<String, List<Object>> map) {
		if (map == null) {
			return;
		}
		// make a deep copy of the map
		Map<String, List<Object>> clonedMap = (Map<String, List<Object>>) deepCopyOfMap(map);
		if (clonedMap != null) {
			Iterator<?> it = clonedMap.entrySet().iterator();
			while (it.hasNext()) {
				Map.Entry<String, List<Object>> entry = (Map.Entry<String, List<Object>>) it.next();
				replaceItemValue(entry.getKey().toString(), entry.getValue());
			}
		}
	}