Hi,
I am new to Hibernate so please redirect me if I am sending to the wrong email or it’s already documented somewhere. But I tried and couldn’t find anything useful.

I wonder if anyone has used Hibernate to map Java Map collection.

I have the below Java Map collection. I couldn’t find any documentation on how to map it in Hibernate.
Public ClassC{
…
Public Map<ClassA, Collection<ClassB>> headacheMap;
}

FYI. If the element is ClassB instead of Collection<ClassB>, we can use the below mapping:
Public ClassC{
…
Public Map<ClassA, ClassB> normalMap;
}

ClassC.hbm.xml:
<class name=”ClassC”>
<map name=”normalMap” table=”mapping_table”>
<key column=”id”/>
<map-key-many-to-many class=”ClassA”/>
<many-to-many class=”ClassB”/>

</map>
</class>

The problem is when we wrap ClassB with a collection, how do we write the mapping file?

One way is to define a classD to wrap Collection<ClassB>. But I am just wondering if there is any way without changing my Java implementation.

Any insight is appreciated. Thanks!

-Chang




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Hibernate version:3.2

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