object is an unsaved transient instance error

[tobimat80]

Hi,

I have problems persisting an object with hibernate in a webflow application:

The object has a one-to-one mapping:

class Main {
...
@OneToOne(fetch = FetchType.LAZY, cascade = CascadeType.ALL)
@PrimaryKeyJoinColumn
@Cascade({org.hibernate.annotations.CascadeType.SAVE_UPDATE})
public Global getGlobal() {
  return this.global;
}
...
}

I am using this method to save the object (in a DAO)

...
public Main save(Main object) {
  return (Main) hibernateTemplate.merge(object);
}
...

My transaction setup is as follows:

...
<tx:advice id="txAdvice" transaction-manager="transactionManager">
  <tx:attributes>
    <tx:method name="get*" read-only="true" propagation="SUPPORTS"/>
    <tx:method name="save*" read-only="false" propagation="REQUIRED"/>
  </tx:attributes>
</tx:advice>

<aop:config>
  <aop:advisor id="managerTX" advice-ref="txAdvice" pointcut="execution(* *..service.*Manager.*(..))"/>
</aop:config>
...

But everytime I try to save the object I get this error:

Caused by: org.hibernate.TransientObjectException: object is an unsaved transient instance - save the transient instance before merging: lu.bce.movie2me.web.model.Global
	at org.hibernate.event.def.DefaultMergeEventListener.getTransientCopyCache(DefaultMergeEventListener.java:128)
	at org.hibernate.event.def.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:90)
	at org.hibernate.impl.SessionImpl.fireMerge(SessionImpl.java:705)
	at org.hibernate.impl.SessionImpl.merge(SessionImpl.java:689)
	at org.hibernate.impl.SessionImpl.merge(SessionImpl.java:693)
	at org.springframework.orm.hibernate3.HibernateTemplate$23.doInHibernate(HibernateTemplate.java:827)
	at org.springframework.orm.hibernate3.HibernateTemplate.doExecute(HibernateTemplate.java:419)
	... 139 more

Any hints and advice would be appreciated. Thanks!

[chudak]

Read the api and pay attention to the difference between save() and merge().