Mapping ArrayList in java to Actionscript Problem

Question

Hi Guys,
This is wrecking my head. Had this issue for the last two days and cannot for the life of me understand why. I have a service defined as with the following method;
public List getIngredients(){
          List list = null;
          List ingredientList = new ArrayList();
          SandwichDAOFactory fac = SandwichDAOFactory.getDAOFactory(1);
          IngredientDAO ingDao = fac.getIngredientDao();
          IngredientDTO ingDTO = new IngredientDTO();
          Ingredient ing = new Ingredient();
          list = ingDao.getAllIngredients();
          for (Iterator it=list.iterator(); it.hasNext();) {
               ing = (Ingredient) it.next();
               ingDTO.setIngredientID(ing.getIngredientID());
               ingDTO.setName(ing.getName());
               ingDTO.setPrice(ing.getPrice());
               ingDTO.setDescription(ing.getDescription());
               ingDTO.setType(ing.getDescription());
              ingredientList.add(ingDTO);
          System.out.println("Calling Service");
          System.out.println(list.toString());
          return list;
Now I have defined a remotes object in my flex app;
I call this service method when I first load the application;
retrievalService.getAllIngredients();
then handle the result as follows;
private function getAllIngredientsResultHandler(event:ResultEvent):void
                 ingredientsListData =  event.result as ArrayCollection;
                 var arrList:Array = event.result as Array;
                 trace("event.result.toString = "+event.result);
                 trace("ingredientsListData = "+ingredientsListData);
                trace("arrList = "+arrList);
I would expect to see the object references delimited in some way for all the trace methods. But when I run the example I get the following output;
event.result.toString = [object IngredientDTO],[object IngredientDTO],[object IngredientDTO],[object IngredientDTO],[object IngredientDTO]
ingredientsListData = null
arrList = null
I dont understand why this is happening. Surely the variables should contain the same info. I did some debugging and found that the event.result object did in fact contain the data as an ArrayCollection. In addition all the elements were objects of the type IngredientDTO and contained all the relevant fields and data. So again I don't understand for the life of me why its not working.
Can you not caste an ArrayList in java to an Array or an ArrayCollection?
Its like the data isn't being mapped or cast properlu from the ArrayList in java to either the Array or the ArrayCollection in actionscript.
This is driving me insane. Has anyone else had this problem and lived to tell the tale?

Answer 1

I figured it out. Silly, silly mistake. I was using the wrong import declaration.
import flex.messaging.io.ArrayList;
instead of
import java.util.ArrayList;
Silly silly...