springmvccontroller返回json出错解决.docx

springmvccontroller返回json出错解决1、出错的地方：@RequestMapping(value = /query)@JsonSerialize(include=JsonSerialize.Inclusion.NON_NULL)public @ResponseBodyJSONObjectquery(@RequestParam(startTime) String startTime,@RequestParam(endTime) String endTime,@RequestParam(oid) String oid, @RequestParam(cid) Integer cid,@RequestParam(pay_channel) String payChannel,@RequestParam(device_type) String deviceType,@RequestParam(phone) Integer phone,@RequestParam(perPage) Integer pageSize,@RequestParam(skipIndex) Integer startIndex) throws Exception {?LogInfo info = populateQueryParam(startTime, endTime, oid, cid,payChannel, deviceType, phone, pageSize, startIndex);?// 总记录数Long totalCount = logMoniterService.queryLogInfoCount(info);?if (totalCount == null) {totalCount = 0L;}?ListLogInfo list = logMoniterService.queryLogInfo(info);?JSONObjectretData = new JSONObject();retData.put(success, true);retData.put(data, list);retData.put(error, );retData.put(totalRecords, totalCount);returnretData;}?2、结果报错：htmlheadtitleApache Tomcat/7.0.42 - Error report/titlestyle!--H1 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:22px;} H2 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:16px;} H3 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:14px;} BODY {font-family:Tahoma,Arial,sans-serif;color:black;background-color:white;} B {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;} P {font-family:Tahoma,Arial,sans-serif;background:white;color:black;font-size:12px;}A {color : black;}A.name {color : black;}HR {color : #525D76;}--/style /headbodyh1HTTP Status 500 - Could not write JSON: Object is null (through reference chain: net.sf.json.JSONObject[quot;dataquot;]-gt;net.sf.json.JSONArray[0]-gt;net.sf.json.JSONObject[quot;createTimequot;]-gt;net.sf.json.JSONNull[quot;emptyquot;]); nested exception is org.codehaus.jackson.map.JsonMappingException: Object is null (through reference chain: