控制台报错：Servlet.service() for servlet [dispatcherServlet] in context
错误信息：Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Circular view path [hello]: would dispatch back to the current handler URL [/hehe/hello] again. Check yo
错误信息：Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Circular view path [hello]: would dispatch back to the current handler URL [/hehe/hello] again. Check your ViewResolver setup! (Hint: This may be the result of an unspecified view, due to default view name generation.)] with root cause
解决方法：检查
1.controller层没有加@ResponseBody
2.Service层（使用dao层）未添加注解@Autowired或者@Resource
3.@RestController使用成了@Controller
4.dao层 添加注解@mapper 或者主启动类@MapperScan("com.wqj.mapper")扫描包
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