#vulnerable code 
                             public HttpConfig json(String json) {
		this.json = json;
		map = new HashMap<String, Object>();
		map.put(Utils.ENTITY_STRING, json);
		return this;
	} 
                            #location 4 
                            #vulnerability type THREAD_SAFETY_VIOLATION
#fixed code
                             public HttpConfig json(String json) {
		this.json = json;
		Map<String, Object> map = new HashMap<String, Object>();
		map.put(Utils.ENTITY_STRING, json);
		maps.set(map);
		return this;
	}