serializer found for class org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer and no proper
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今天在做用json异步提交按关键字查询数据的时候总是出现 No serializer found for class org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer and no properties discovered异常,一开始总是以为是List集合转换成json数据的时候转换不成功,经过百度查询资料已经结合hibernate的文档,终于解决了问题。
异常
java.lang.IllegalArgumentException: 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 SerializationConfig.SerializationFeature.FAIL_ON_EMPTY_BEANS) ) (through reference chain: java.util.ArrayList[0]->org.iep.model.hibernate.Menu["parent_menu"]->org.iep.model.hibernate.Menu_$$_jvst62a_2["handler"])
原来的Menu.hbm.xml
<?xml version="1.0"?><!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN""http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"><!-- Generated 2015-5-10 22:16:21 by Hibernate Tools 3.4.0.CR1 --><hibernate-mapping> <class name="org.iep.model.hibernate.Menu" table="t_base_menu"> <id name="id" type="java.lang.Integer"> <column name="ID" /> <generator class="assigned" /> </id> <property name="name" type="java.lang.String"> <column name="NAME" /> </property> <property name="url" type="java.lang.String"> <column name="URL" /> </property> <property name="ico" type="java.lang.String"> <column name="ICO" /> </property> <property name="status" type="java.lang.Integer"> <column name="STATUS" /> </property> <property name="parent_id" type="java.lang.Integer"> <column name="PARENT_ID" /> </property> <many-to-one name="parent_menu" column="parent_id" class="org.iep.model.hibernate.Menu" update="false" insert="false" /> </class></hibernate-mapping>
解决办法只要在
<many-to-one name="parent_menu" column="parent_id" class="org.iep.model.hibernate.Menu" update="false" insert="false" />
中添加
lazy="false"
下面是网上面的解释
出现这种异常的本质原因是有点诡异,hibernate在获取一个Entity的时候,第一步获取到是Entity的Proxy. 如果仅仅在获取到Proxy以后Session就关闭的话,就会出现这个异常。在Hibernate3.0中,Entity的Proxy与真实实体之间默认是lazy loading的,如果在一个transaction仅仅获取了一下Entity的Proxy,然后transaction就commit, 这个时候也会出现上述异常。
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