HttpMessageNotWritableException: Could not write JSON: No serializer found for class ****

今天碰到一个异常，下面是错误信息

org.springframework.http.converter.HttpMessageNotWritableException:   
Could not write JSON: No serializer found for class org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer and no properties discovered to create BeanSerializer   
(to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) )   

根据提示，大致的意思应该是City类在转化为json时，有属性值是null，最后我在City类中加入了下面的一句代码

@JsonIgnoreProperties({ "handler","hibernateLazyInitializer" })

问题得到了解决，需要值得注意的是：我的工程中有两个JsonIgnoreProperties注解，分别是：

org.codehaus.jackson.annotate.JsonIgnoreProperties;

和com.fasterxml.jackson.annotation.JsonIgnoreProperties;

应该使用com.fasterxml.jackson.annotation.JsonIgnoreProperties;

参考：http://blog.youkuaiyun.com/switch_zyp/article/details/50633629