Hello,

I ended up using this, which works : 

public class IcaosListAjaxFormBinder extends FormBinder implements FormLoadBinder, FormLoadMultiRowElementBinder {

    public FormRowSet load(Element element, String primaryKey, FormData formData) {

        FormRowSet names = new FormRowSet();

 String processId = formData.getProcessId();

 if (primaryKey != null && processId!= null && !primaryKey.equals(processId)) {

            //primaryKey != processId on AJAX loading because
 //primaryKey == manualName on AJAX loading

 RawPagesDao rawpagesdao = (RawPagesDao) AppContext.getInstance().getAppContext().getBean("rawPagesDao");

 Set<String> dataFromDB = rawpagesdao.getDatasFromManual(formData.getProcessId(), primaryKey);

 FormRow dataEntry = new FormRow();
 JSONStringer datasList = new JSONStringer();
 try {
                datasList.array();

 for (String dataName : dataFromDB) {
                    datasList.object().key("dataName").value(dataName).key("selected").value(false).endObject();
 }

                datasList.endArray();

 dataEntry.put("generationRequirementsNames", datasList.toString());
 } catch (JSONException ex) {
                LogUtil.error(getClassName(), ex, String.format("Encountered a JSON error: %s", ex.getMessage()));
 }

            names.add(dataEntry);
 }

        return names;
 }
    
    //Add overriding stuff here
}

Regards,

Raphaël

That's great, thanks for sharing your solution!

You're welcome, but do you know how to format code in a pretty way?