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) )
(through reference chain: com.risejoin.framework.web.view.params.DataGridResponse["aaData"]
->java.util.ArrayList[0]
->com.risejoin.adminplatform.operationcenter.domain.house.Buildings["subwayAround"]
->org.hibernate.collection.internal.PersistentSet[0]
->com.risejoin.adminplatform.operationcenter.domain.house.SubWayStation["subWay"]
->org.hibernate.collection.internal.PersistentSet[0]
->com.risejoin.adminplatform.operationcenter.domain.house.SubWay["city"]
->com.risejoin.adminplatform.operationcenter.domain.commons.City_$$_javassist_18["handler"]);

nested exception is com.fasterxml.jackson.databind.JsonMappingException:
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) )
(through reference chain: com.risejoin.framework.web.view.params.DataGridResponse["aaData"]
->java.util.ArrayList[0]
->com.risejoin.adminplatform.operationcenter.domain.house.Buildings["subwayAround"]
->org.hibernate.collection.internal.PersistentSet[0]
->com.risejoin.adminplatform.operationcenter.domain.house.SubWayStation["subWay"]
->org.hibernate.collection.internal.PersistentSet[0]
->com.risejoin.adminplatform.operationcenter.domain.house.SubWay["city"]
->com.risejoin.adminplatform.operationcenter.domain.commons.City_$$_javassist_18["handler"])

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;