hibernate增加数据报错

Question

2011-11-1 22:25:01 org.apache.catalina.core.StandardWrapperValve invoke
严重: Servlet.service() for servlet default threw exception
org.hibernate.TransientObjectException: object references an unsaved transient instance - save the transient instance before flushing: org.shj.houseproject.pojo.Area
at org.hibernate.engine.ForeignKeys.getEntityIdentifierIfNotUnsaved(ForeignKeys.java:219)
at org.hibernate.type.EntityType.getIdentifier(EntityType.java:397)
at org.hibernate.type.ManyToOneType.nullSafeSet(ManyToOneType.java:78)
at org.hibernate.persister.entity.AbstractEntityPersister.dehydrate(AbstractEntityPersister.java:1997)
at org.hibernate.persister.entity.AbstractEntityPersister.update(AbstractEntityPersister.java:2371)

下面是我的pojo
area.hbm.xml
catalog="houseProject" lazy="false">













house.bhm.xml
catalog="houseproject" lazy="false">




fetch="select" lazy="false" cascade="save-update,persist">


fetch="select" lazy="false" cascade="save-update,persist">



























street.hbm.xml
catalog="houseproject" lazy="false">







fetch="select" lazy="false">








user.hbm.xml
catalog="houseproject">





length="30">







我其实就是想把数据加到house表里面就出现异常
希望大家帮帮我我新手一个

Answer 1

object references an unsaved transient instance - save the transient instance before flushing:

插入house的时候 user和street外键指向了还未保存的对象

house.bhm.xml
persist去掉试试，然后插入house的时候要保证对应的street和user已经存在
[code="java"] fetch="select" lazy="false" cascade="save-update,persist">


fetch="select" lazy="false" cascade="save-update,persist">

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