SpringBoot中springMVC返回JSON報錯-->Could not write JSON: No serializer found for class org.spring...

用springboot簡單寫一個返回Model的小例子，由於控制器上註解爲@RestController，自動應該返回json格式，報錯：html >Could not write JSON: No serializer found for class org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMet

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