How to make Object class to be serializable?

Question

I'm writing a session bean which contains an Object[][] as a return e.g
public Object[][] getFoo(){
I need the return to be of type Object since I'm constracting a 2D array of different object types e.g Integer, Double, HashMap, String etc. But EJBs require serializable objects for their public remote methods. Could you please advice me whether there is another class that I could use instead of the Object class to be serializable? I'm still using SDK1.3.1.
Thank you

Answer 1

I've already tried that before, but it doesn't work. When I try to assign different objects to my array as in the following example:
ABC[][] abc = new ABC[4][2];
abc[0][0] = new Integer(1);
abc[0][1] = new String("abc");
abc[0][2] = new HashMap();
I'm getting compilation error since Integer, String and HashMap can not be casted into ABC. My question is whether there is such a class (part of the SDK) which implements Serializable AND these classes can be casted to, as in the above example?