How do I get a strongly typed collection from BlazeDS?

Question

I\'ve exposed a Spring bean to my Flex app via BlazeDS. In my Java code I return strongly typed lists. e.g.

public List getFolders(String path) {
          


        

Answer 1

I finally resolved this issue following a bit of Googling. Here are the rules of Flex remoting that I found:

1. Annotate the Flex value object to indicate the Java class that it relates to. This is essential if the package name differs. – e.g. [Bindable][RemoteClass(alias=”package.JavaClass”)] public class FlexClass {}

2. The constructors MUST match in Flex and Java value objects. I ended up sticking to public no-args constructors just to keep it simple.

3. Getters and setters MUST match between Flex and Java value objects.

4. The last rule is a cracker – You MUST instantiate any classes that you need to deserialize to. On the face of it this shouldn’t be a problem however I spent days trying to deserialize the results of a remote getObjectsAtPath() call - a list of PersistentObjects which contained instances of Folder and Document (both are subclasses of PersistentObject). If you don’t explicitly instantiate the class (in my case the Folder class) it does NOT get included in the SWF file (unlike Java)! I eventually create a dummy variable of type Folder to get around this.

Thanks to everyone for your suggestions.