[castor-user] Fwd: [XML] ValidationException mapping a map

[Paco Fortanet]

anybody?

---------- Forwarded message ----------
From: Paco Fortanet <fforta...@gmail.com>
Date: 2011/2/16
Subject: [XML] ValidationException mapping a map
To: user@castor.codehaus.org


Hi! I'm trying to unmarshall this input

<root>
   <children key="key1">value1</children>
   <children key="key2">value2</children>
   <children key="key3"></children>
</root>

using this mapping

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
  <mapping>
    <class name="Root">
        <map-to xml="root"/>
        <field name="children" collection="map">
            <bind-xml name="children">
                <class name="org.exolab.castor.mapping.MapItem">
                    <field name="key" type="string">
                        <bind-xml name="key" node="attribute"/>
                    </field>
                    <field name="value" type="string">
                        <bind-xml node="text"/>
                    </field>
                </class>
            </bind-xml>
        </field>
    </class>
  </mapping>

and this code

     Mapping map = new Mapping();
     map.loadMapping("mapping.xml");
     Unmarshaller un = new Unmarshaller(Root.class);
     un.setMapping(map);
     Root root = (Root) un.unmarshal(new FileReader("input.xml"));

then this exception is thrown because of the empty node "key3" (I suppose)

Caused by: ValidationException: unable to resolve reference:
org.exolab.castor.mapping.MapItem@7f8062
       at
org.exolab.castor.xml.UnmarshalHandler.endElement(UnmarshalHandler.java:907)
       at
org.exolab.castor.xml.UnmarshalHandler.endElement(UnmarshalHandler.java:1119)
       at org.apache.xerces.parsers.AbstractSAXParser.endElement(Unknown
Source)
       at
org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanEndElement(Unknown
Source)
       at
org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown
Source)
       at
org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown
Source)
       at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
       at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
       at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
       at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
       at
org.exolab.castor.xml.Unmarshaller.unmarshal(Unmarshaller.java:729)
       at
org.exolab.castor.xml.Unmarshaller.unmarshal(Unmarshaller.java:621)

is there any way to unmarshall this?
Thank you