Hallo everyone,

there is a property in our project which should be saved in the database:

private map<String, map<String, RelExpColumn>> caches;

I used the Hibernate-Tool to generate Mapping-Konfiguration for this property and got this one:

<map name="caches" table="RELEXPCOLUMN" lazy="true" access="field">
<key>
<column name="M_STRCOLUMN" />
</key>
<map-key type="java.lang.String"></map-key>
<element type="java.lang.String">
<column name="CACHES" />
</element>
</map>

And it does not work because each component of the property caches is also a map. But according to this Mapping-Konfiguration, these components are mapped as String.
Please tell me how to map this property.Thanks.