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Grid / sortable additionnal column

by Francois Malet :: Rate this Message:

Hello,
I use Tapestry 5.1.0.5
My goal is to add a column to a grid and to make it sortable.
Of course, this column is not part of the grid datasource (otherwise I wouldn't need to add it).
I have written a page based on example provided here:
http://wiki.apache.org/tapestry/Tapestry5GridComponent
Everything seems to be ok (up and down arrows are displaid), but when I try to sort on this additionnal column, I get a nullpointer exception. (but when I try to sort on other columns it still works).

So, I guess I've done something unporperly, but I don't manage to find what. Do u have any idea?

Here is the error :
java.lang.NullPointerException
org.apache.tapestry5.internal.grid.CollectionGridDataSource$2.compare(CollectionGridDataSource.java:78)
org.apache.tapestry5.internal.grid.CollectionGridDataSource$3.compare(CollectionGridDataSource.java:91)
java.util.Arrays.mergeSort(Arrays.java:1284)

Here is my class page :

public class UploadsIndex {

   @Inject
   private UploadManager uploadManager;
   /** The model. */
    @Retain
    private BeanModel beanModel;

    /** The bean model source. */
    @Inject
    private BeanModelSource beanModelSource;

    /** The resources. */
    @Inject
    private Messages messages;

    void pageLoaded() {
          beanModel=beanModelSource.createEditModel(Upload.class, messages);
          PropertyModel dModel= beanModel.add("download",null);
          dModel.sortable(true);

    }

    public BeanModel getBeanModel() {
       return beanModel;
    }

   public List<Upload> getAllUploads() {
        return uploadManager.findAll();
    }

     @Property
   private Upload upload;

}

And here is the tml page :
...
    <body>
        <h1>All Uploads</h1>
       <t:grid t:id="grid" t:source="allUploads" row="upload" exclude="uploadId" t:model="beanModel" >
        <t:parameter name="downloadCell">
                  <t:actionlink t:id="downloadUpload" context="upload.uploadId">${upload.name}</t:actionlink>
        </t:parameter>
       </t:grid>
    </body>
...

Thanks For your help!
Kind Regards
Emmanuel

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