3回答

• 

  開sennsei

  2018-06-13 23:30:08

  同问！

  
  

  0 0
• 

  qq_amangirl_0

  2018-04-12 13:02:03

  老师，我直接返回Resource报错了，为什么

  @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"])

  
  

  2 0

  zsir94 回复開senns...

  其实不是加载顺序原因，调试可以发现，返回的json串中，该读取的属性是有值的，但是可以发现data中除了属性文件中的这些字段值，还多了一些属性，如$$beanFactory，原因应该是Resource对象是Spring构造的，Spring给这个对象加入元数据之类的其他属性，这些属性Jackson解析不了，所以报错了，可以看到异常里也提示了 找不到$$beanFactory

  2018-07-22 19:50:21

  共 2 条回复 >

• 

  itachy

  2018-03-22 19:12:13

  当然可以啦

  0 0