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

今天碰到一個異常，下面是錯誤信息

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) )   

根據提示，大致的意思應該是City類在轉化為json時，有屬性值是null，最后我在City類中加入了下面的一句代碼

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

問題得到了解決，需要值得注意的是：我的工程中有兩個JsonIgnoreProperties注解，分別是：

org.codehaus.jackson.annotate.JsonIgnoreProperties;

和com.fasterxml.jackson.annotation.JsonIgnoreProperties;

應該使用com.fasterxml.jackson.annotation.JsonIgnoreProperties;

參考：http://blog.csdn.net/switch_zyp/article/details/50633629