springmvccontroller返回json出错解决

org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)

org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:66)

org.apache.shiro.web.servlet.AbstractShiroFilter.executeChain(AbstractShiroFilter.java:449)

org.apache.shiro.web.servlet.AbstractShiroFilter$1.call(AbstractShiroFilter.java:365)

org.apache.shiro.subject.support.SubjectCallable.doCall(SubjectCallable.java:90)

org.apache.shiro.subject.support.SubjectCallable.call(SubjectCallable.java:83)

org.apache.shiro.subject.support.DelegatingSubject.execute(DelegatingSubject.java:383)

org.apache.shiro.web.servlet.AbstractShiroFilter.doFilterInternal(AbstractShiroFilter.java:362)

org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)

org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:343)

org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:260)

org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)

org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

root cause

org.codehaus.jackson.map.JsonMappingException: Object is null (through reference chain: 
net.sf.json.JSONObject["data"]->net.sf.json.JSONArray[0]->net.sf.json.JSONObject["createTime"]->net.sf.json.JSONNull["empty"]) 
org.codehaus.jackson.map.JsonMappingException.wrapWithPath(JsonMappingException.java:218) 
org.codehaus.jackson.map.JsonMappingException.wrapWithPath(JsonMappingException.java:183) 
org.codehaus.jackson.map.ser.std.SerializerBase.wrapAndThrow(SerializerBase.java:140)   
 3原因分析： 
可能是json序列化的问题 代码修改为 
@RequestMapping(value = \public @ResponseBody 
Map query(@RequestParam(\@RequestParam(\
@RequestParam(\@RequestParam(\@RequestParam(\@RequestParam(\@RequestParam(\
@RequestParam(\  
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; }   
List list = logMoniterService.queryLogInfo(info);   
Map result = new HashMap();   
result.put(\ result.put(\ result.put(\ 
result.put(\ return result; }   
4、问题解决 
 
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