Hibernate oneToMany - object 引用未保存的瞬态实例

Question

I have a table with a oneToMany relation:

<hibernate-mapping>
    <class name="com.al6.jtob.data.Lsell" table="LSELL" >
    ...
       <many-to-one name="stock" class="com.al6.jtob.data.Stock" insert="false" update="false">
          <column name="IDITEM" />
          <column name="IDWAREHOUSE" />
       </many-to-one>
    ...
    </class>
</hibernate-mapping>

The StockID is composed by (IDITEM, IDWAREHOUSE).

It works well when I load existing LSELL objects. But when I create a new LSELL object, I have this error:

Caused by: javax.ejb.EJBException: org.hibernate.TransientObjectException: object references an unsaved transient instance - save the transient instance before flushing: com.al6.jtob.data.Stock

I don't want to update or save any new "stock" into database, it's just a readonly data. All the stock data are complete and suffisant. The goal is just to get the "stock" of the "Lsell" when I display a "Lsell".

Answer 1

You forget to declare CascadeType in relational mapping. you have to put cascade=all in mapping tag because CascadeType propagates entity transitions from Parent to Child. For example, if you persist parent entity the referenced entities also get persisted before flushing.

<one-to-many name="lsell" class="com.al6.jtob.data.Lsell" cascade="all">
   ...
</one-to-many>