RE: Unmarshalling a collection from the root with a wrapper class fails to find field descriptors

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RE: Unmarshalling a collection from the root with a wrapper class fails to find field descriptors

by Rachel Wilson :: Rate this Message:

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Apologies. It's very late here and I've been looking at this for over
12 hours now. I had tried to simplify the code and take out names
that only mean something to me and I noticed at the last second that
i'd missed a few. I've corrected that in-situ below. Please forgive
the multiple posts, even i'm annoyed at myself...

This should be correct now

* * * * *

I have already posted a message "Mapping a List at root returns
AnyNode objects instead of desired mapped object" and tried another
tack only to be thwarted again unfortunately so I'm clearly doing
something quite daft.

I need to unmarshall a list of simple objects and this time I have
created a wrapper java class to hold the list. But I can't seem to
get the mapping right. (Hopefully it's a mistake that will help
another beginner at least)

Here is the XML I'd like to unmarshall:

<search-publications-response item-count="2">
<publication id="abc" />
<publication id="def" />
</search-publications-response>

Here are my java classes:

public class SearchPubsResponse
{
private List pubs;

public List getPublicationList()
{
return pubs;
}

public void setPublicationList(List pubsList)
{
this.pubs = pubsList;
}
}

public class PublicationImage
{
private String articleId;

public String getArticleId()
{
return articleId;
}

public void setArticleId(String articleId)
{
this.articleId = articleId;
}
}

here is my mapping file (castor-mapping-pubs.xml):

<mapping>

<class name="qmul.qmrae.domain.SearchPubsResponse">
<map-to xml="search-publications-response" />
<field name="publicationList"
type="qmul.qmrae.domain.PublicationImage" collection="collection"
container="false">
<bind-xml name="publication" />
</field>
</class>

<class name="qmul.qmrae.domain.PublicationImage">
<field name="articleId">
<bind-xml name="id" node="attribute" />
</field>
</class>

</mapping>

And here is the unmarshalling java:

Unmarshaller unmarshaller = new Unmarshaller();

Mapping map = new Mapping();
map.loadMapping(getClass().getResource( "/castor-mapping-pubs.xml"
));
unmarshaller.setMapping(map);

List pubs = (ArrayList)
unmarshaller.unmarshal(fileReaderForMyXML);

SearchPubsResponse searchPubsResponse = (SearchPubsResponse)
unmarshaller.unmarshal(fileReader);

// this step returns null
List pubs = searchPubsResponse.getPublicationList();

But in the logs I see the following when it gets to the unmarshalling
step: org.exolab.castor.xml.UnmarshalHandler - unable to find
FieldDescriptor for 'publication' in ClassDescriptor of
search-publications-response - ignoring extra element.

And nothing is returned in the List

I expect what's causing this is at the root of my other problem but I
just can't seem to unpick this. I've been following this example
(http://castor.org/xml-mapping.html#4.-Usage-Pattern) and it looks the
same to me :-s

Hope you can help,
Rachel

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Re: RE: Unmarshalling a collection from the root with a wrapper class fails to find field descriptors

by Werner Guttmann-6 :: Rate this Message:

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Hi,

that's something that is not really achievable. Have a look at the
following code fragment:

SearchPubsResponse entity =
(SearchPubsResponse) unmarshaller.unmarshal(new
InputSource(getClass().getResource(SAMPLE_FILE).toExternalForm()));

assertNotNull (entity);
assertNotNull(entity.getPublicationList());
assertFalse(entity.getPublicationList().isEmpty());
assertEquals(2, entity.getPublicationList().size());

As you can see, I am instructing Castor XML to unmarshal an instance of
SearchPubsresponse. Subsequently, I am accessing the collection of
PublicationImages via the collection property of that class.

I hope this helps.

Werner

Rachel Wilson wrote:

> Apologies. It's very late here and I've been looking at this for over
> 12 hours now. I had tried to simplify the code and take out names
> that only mean something to me and I noticed at the last second that
> i'd missed a few. I've corrected that in-situ below. Please forgive
> the multiple posts, even i'm annoyed at myself...
>
> This should be correct now
>
>
> * * * * *
>
> I have already posted a message "Mapping a List at root returns
> AnyNode objects instead of desired mapped object" and tried another
> tack only to be thwarted again unfortunately so I'm clearly doing
> something quite daft.
>
> I need to unmarshall a list of simple objects and this time I have
> created a wrapper java class to hold the list. But I can't seem to
> get the mapping right. (Hopefully it's a mistake that will help
> another beginner at least)
>
>
>
> Here is the XML I'd like to unmarshall:
>
> <search-publications-response item-count="2">
> <publication id="abc" />
> <publication id="def" />
> </search-publications-response>
>
>
> Here are my java classes:
>
> public class SearchPubsResponse
> {
> private List pubs;
>
> public List getPublicationList()
> {
> return pubs;
> }
>
> public void setPublicationList(List pubsList)
> {
> this.pubs = pubsList;
> }
> }
>
>
> public class PublicationImage
> {
> private String articleId;
>
> public String getArticleId()
> {
> return articleId;
> }
>
> public void setArticleId(String articleId)
> {
> this.articleId = articleId;
> }
> }
>
>
> here is my mapping file (castor-mapping-pubs.xml):
>
>
> <mapping>
>
> <class name="qmul.qmrae.domain.SearchPubsResponse">
> <map-to xml="search-publications-response" />
> <field name="publicationList"
> type="qmul.qmrae.domain.PublicationImage" collection="collection"
> container="false">
> <bind-xml name="publication" />
> </field>
> </class>
>
>
> <class name="qmul.qmrae.domain.PublicationImage">
> <field name="articleId">
> <bind-xml name="id" node="attribute" />
> </field>
> </class>
>
> </mapping>
>
>
>
> And here is the unmarshalling java:
>
> Unmarshaller unmarshaller = new Unmarshaller();
>
> Mapping map = new Mapping();
> map.loadMapping(getClass().getResource( "/castor-mapping-pubs.xml"
> ));
> unmarshaller.setMapping(map);
>
> List pubs = (ArrayList)
> unmarshaller.unmarshal(fileReaderForMyXML);
>
> SearchPubsResponse searchPubsResponse = (SearchPubsResponse)
> unmarshaller.unmarshal(fileReader);
>
> // this step returns null
> List pubs = searchPubsResponse.getPublicationList();
>
>
>
> But in the logs I see the following when it gets to the unmarshalling
> step: org.exolab.castor.xml.UnmarshalHandler - unable to find
> FieldDescriptor for 'publication' in ClassDescriptor of
> search-publications-response - ignoring extra element.
>
> And nothing is returned in the List
>
> I expect what's causing this is at the root of my other problem but I
> just can't seem to unpick this. I've been following this example
> (http://castor.org/xml-mapping.html#4.-Usage-Pattern) and it looks the
> same to me :-s
>
>
> Hope you can help,
> Rachel
>
>
> ---------------------------------------------------------------------
> To unsubscribe from this list, please visit:
>
> http://xircles.codehaus.org/manage_email
>
>

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