同問！

老師，我直接返回Resource報錯了，為什么

@RequestMapping("/getResource")

public JsonUtil getResource() {

Resource bean=new Resource();

//BeanUtils.copyProperties(resource, bean);

//System.out.println(resource);

//System.out.println(bean);

return JsonUtil.ok(resource);

}

2018-04-12 13:01:56.862 ?WARN 10980 --- [nio-8090-exec-3] .w.s.m.s.DefaultHandlerExceptionResolver : Failed to write HTTP message: org.springframework.http.converter.HttpMessageNotWritableException: Could not write JSON: No serializer found for class org.springframework.context.expression.StandardBeanExpressionResolver and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS); nested exception is com.fasterxml.jackson.databind.JsonMappingException: No serializer found for class org.springframework.context.expression.StandardBeanExpressionResolver and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) (through reference chain: com.imooc.util.JsonUtil["date"]->com.imooc.model.Resource$$EnhancerBySpringCGLIB$$21953e4a["$$beanFactory"]->org.springframework.beans.factory.support.DefaultListableBeanFactory["beanExpressionResolver"])

2018-04-12 13:01:56.862 ?WARN 10980 --- [nio-8090-exec-3] .w.s.m.s.DefaultHandlerExceptionResolver : Resolved exception caused by Handler execution: org.springframework.http.converter.HttpMessageNotWritableException: Could not write JSON: No serializer found for class org.springframework.context.expression.StandardBeanExpressionResolver and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS); nested exception is com.fasterxml.jackson.databind.JsonMappingException: No serializer found for class org.springframework.context.expression.StandardBeanExpressionResolver and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) (through reference chain: com.imooc.util.JsonUtil["date"]->com.imooc.model.Resource$$EnhancerBySpringCGLIB$$21953e4a["$$beanFactory"]->org.springframework.beans.factory.support.DefaultListableBeanFactory["beanExpressionResolver"])

當然可以啦