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可以獲取列表/superadmin/listarea，但無(wú)法獲取/superadmin/getareaid?areaid=2，路徑?jīng)]問(wèn)題，數(shù)據(jù)庫(kù)有areaid=2包含內(nèi)容，json無(wú)法獲取信息。

————項(xiàng)目啟動(dòng)運(yùn)行成功—————

com.houtai.demo.DemoApplication? ? ? ? ? : Started DemoApplication in 5.638 seconds (JVM running for 8.145)

o.a.c.c.C.[Tomcat].[localhost].[/demo]? ?: Initializing Spring DispatcherServlet 'dispatcherServlet'

o.s.web.servlet.DispatcherServlet? ? ? ? : Initializing Servlet 'dispatcherServlet'

o.s.web.servlet.DispatcherServlet? ? ? ? : Completed initialization in 11 ms

o.a.c.c.C.[.[.[.[dispatcherServlet]? ? ? : Servlet.service() for servlet [dispatcherServlet] in context with path [/demo] threw exception [Request processing failed; nested exception is java.lang.NullPointerException] with root cause

java.lang.NullPointerException: null

at com.houtai.demo.web.AreaController.getAreaById(AreaController.java:45) ~[classes/:na]

以上為異常信息，java45為Area area = areaService.getAreaById(areaId);上下文沒(méi)錯(cuò)。異常處理信息errMsg：null

懇請(qǐng)老師和各位同學(xué)們幫忙解疑，git clone老師的項(xiàng)目下來(lái)運(yùn)行也是一樣的結(jié)果。

陳imooc

2018-12-26

源自：SpringBoot+MyBatis搭建迷你小程序 3-9

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慕課_Codeboy 回答被采納 +2 積分
2018-12-29

@RequestMapping(value?=?"/getareaid",method?=?RequestMethod.GET)
//下面的areaId要和地址欄上面的?areaId相同?areaid不行?應(yīng)該是Java嚴(yán)格區(qū)分大小寫(xiě)的原因?是areaId就是areaId
private?Map<String,Object>?getAreaId(Integer?areaId){
????Map<String,Object>?modelMap=new?HashMap<String,?Object>();
????Area?area=areaService.queryAreaById(areaId);
????
????
????modelMap.put("area",area);
????return?modelMap;