JSON合并：java.lang.NullPointerException

Question

我遇到一个问题，当我尝试合并JSON时遇到错误：java.lang.NullPointerException。

我有一个JSON对象：mergedJSON2，在合并到另一个JSON对象之前，我需要获取值，进行重构和排序。错误发生在以下代码行：

mergedJSONDataLog = mergeJSONObjects（mergedJSONDataLog，mergedJSON3）;

我已经按照如下方式使用了合并功能：

 public static JSONObject mergeJSONObjects(JSONObject json1, JSONObject json2) {
        JSONObject mergedJSON = new JSONObject();
        try {
            mergedJSON = new JSONObject(json1, JSONObject.getNames(json1));
            for (String crunchifyKey : JSONObject.getNames(json2)) {
                mergedJSON.put(crunchifyKey, json2.get(crunchifyKey));
            }

        } catch (JSONException e) {
            throw new RuntimeException("JSON Exception" + e);
        }
        return mergedJSON;
    }

代码如下：

System.out.println("JSON DATA is: "+mergedJSON2);
JSONObject mergedJSON3 = new JSONObject();
JSONObject mergedJSONDataLog = null;
for(int uT=1; uT < lengthTime+1; uT++) {

    String str = Integer.toString(uT);

    JSONArray arrTime=(JSONArray)mergedJSON2.get(str);
    JSONObject objTime;

    String timeLoginManipulate,timeInsertManipulate,browserInfoManipulate, browserOSNameManipulate,
       ipIntManipulate, latitudeManipulate, longitudeManipulate, spIDManipulate;

    for (Object roTime : arrTime) { //roTime

         objTime = (JSONObject) roTime;

         timeInsertManipulate = String.valueOf(objTime.get("loginTime"));

        if (timeInsertManipulate != sTime) { 
                    timeLoginManipulate = String.valueOf(objTime.get("timeLogin"));
                browserInfoManipulate = String.valueOf(objTime.get("browserInfo"));
                browserOSNameManipulate = String.valueOf(objTime.get("browserOSName"));
                ipIntManipulate = String.valueOf(objTime.get("ipInt"));
                latitudeManipulate = String.valueOf(objTime.get("latitude"));
                longitudeManipulate = String.valueOf(objTime.get("longitude"));
                spIDManipulate = String.valueOf(objTime.get("spID"));

                    JSONArray jArrayDataLogManipulate = new JSONArray();
                    JSONObject objManipulate = new JSONObject();

                    objManipulate.put("timeLogin", timeLoginManipulate);
                    objManipulate.put("browserInfo", browserInfoManipulate);
                    objManipulate.put("browserOSName", browserOSNameManipulate);
                    objManipulate.put("ipInt", ipIntManipulate); 
                    objManipulate.put("latitude", latitudeManipulate);
                    objManipulate.put("longitude", longitudeManipulate);
                    objManipulate.put("spID", spIDManipulate);  


                    jArrayDataLogManipulate.put(objManipulate); 

                JSONObject jObjDataLogManipulate = new JSONObject();

                    jObjDataLogManipulate.put(str, jArrayDataLogManipulate); 

                mergedJSON3 = jObjDataLogManipulate;

                mergedJSONDataLog = mergeJSONObjects(mergedJSONDataLog, mergedJSON3);          
        }
    }//end for roTime
} //end for uT