A multi select DB list is stored in a sub table. It seems you have used a
string to store the value but you can't.
Look at the hbm of XWiki on the way the DBStringListProperty is done
<joined-subclass name="com.xpn.xwiki.objects.DBStringListProperty"
table="xwikilists">
<key>
<column name="XWL_ID" />
<column name="XWL_NAME" />
</key>
<list name="list" table="xwikilistitems" lazy="false">
<key>
<column name="XWL_ID" />
<column name="XWL_NAME" />
</key>
<index column="XWL_NUMBER"/>
<element column="XWL_VALUE" type="string" />
</list>
</joined-subclass>
Now I'm not sure exactly how to do it. I've never tried it. If you make it
work please tell us.
2011/11/16 Edo Beutler <[email protected]>
> Hi
>
> Today I tried to create a custom mapping for a class. One field of the
> class is a DBList with the "Multiple Select" option activated. To save
> the values to the DB I wanted to use a string field like I'm used to
> with static lists and non multi select DB lists. Now I get the
> following exception when trying to save a Document with an object
> attached: "java.util.ArrayList cannot be cast to java.lang.String"
>
> How could I custom map a DBList field if String ist not possible? or
> is there even a simple Solution I missed?
>
> A hint in the right direction would be appreciated
> Edo
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>
--
Ludovic Dubost
Founder and CEO
Blog: http://blog.ludovic.org/
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