Question

I’m using BlazeDS to connect Flex with Java. I’m having trouble passing ArrayLists of custom objects from Flex to java.

I have two objects, one is called Category, the other Section. A Category has an ArrayList of Section objects. I can send an ArrayList of Category objects back and forth between Flex and Java, the problem is when I try to access the sections ArrayList of a Category object that has been returned to Java from Flex, I get the following error:

flex.messaging.MessageException: java.lang.ClassCastException : flex.messaging.io.amf.ASObject 

For some reason I’m getting an ArrayList of ASObjects rather than my Section objects. I tried looking up how to explicitly type arrays in actionscript, but the only thing I could find was using a Vector object, which BlazeDS does not support. Is it possible to pass an ArrayList of Section objects within an ArrayList of Category objects, or do I have to find another way around?

Answer 1

Flex was actually sending back a flex.messaging.io.ArrayCollection object. Below is the code to convert this to an ArrayList of my java class:

public ArrayList<MyObject> convertArrayCollection(ArrayCollection array){         ArrayList<MyObject> myObjectArray = new ArrayList();         ASTranslator ast = new ASTranslator();         MyObject myObject;         ASObject aso;          for (int i=0;i< array.size(); i++){             myObject = new MyObject();             aso = new ASObject();              aso = (ASObject) array.get(i);             aso.setType('com.myPackage.MyObject');             myObject = (MyObject) ast.convert(aso, MyObject.class);             myObjectArray.add(myObject);         }         return myObjectArray;     }