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JDO allows mapping of Maps where there is no join table. The metadata for the Employee/Department mapping uses the mapped-by attribute of the map element:
<class name="Department">
<field name="employees" mapped-by="dept">
<key mapped-by="id"/>
</field>
</class>
<class name="Employee">
<field name="id" column="ID"/>
<field name="dept" column="DEPT"/>
</class>
Another mapping would have the key of the Map be the Employee and the value be the id.
We should probably define a separate package for this mapping, as there is some confusion in using parts of the Company model where we have changed a significant part of the model.
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Test
Resolved
Major
Need new test cases for Map and List where there is no join table; the key is a field of the value type or the value is a field of the key type
