小编Tka*_*gen的帖子

我有控制器:

@RequestMapping(method = RequestMethod.GET)
public String getViewRailwayService(@RequestParam long id, Model model) {
    model.addAttribute("railwayService",railwayServiceRepository.findOne(id));
    return "admin/railwayService/view";
}

和jsp页面:

...
<title>${railwayService.name}</title>
<c:forEach var="company" items="${railwayService.companies}">
...

它工作正常,但我很困惑,当railwayServiceRepository.findOne(id)返回nullNullPointerException不抛出.