Serialization custom Class Object

Question

Hi,
I'm kind of stuck with a problem.
I've been writing a servlet and applet that are communicating over
internet using a socket connection and Object Serialization.
The objects that are passed are custom:
public class mcuComObj implements Serializable{
    static final long  serialVersionUID = 2222;
    private String name;
    private Vector attributes;
    ...There are some more functions but those are not of any interest.
In the vector attributes, I've planted a jPanel (swing).
The weird thing is that this morning, it worked a few times...after that
I'm getting the:
javax.swing.JComponent; local class incompatible: stream classdesc serialVersionUID = 6954663636822719621, local class serialVersionUID = 5896976265092562486 ERROR message.
The send code:
Vector v = new Vector();
Object objButton = (Object) jButton1;
v.add(objButton);
obj.setAttributes(v);  //obj = mcuComObj
con.sendObject(obj);   //con = socket connection threadThe receive code:
Object input= (Object) objInpStr.readObject();When I serialize the mcuComObj class, does it also serialize the
embedded objects (in this case that are in the Vector)?
The main question is...how can I solve this? I can not guarantee that
both Servlet and Applet have the same JDK running...!
Have anyone of you got any ideas?
Thanks in advance,
Chris van Diemen

Answer 1

If the "magic numbers" (sent at the beginning of any writeObject() call) on the sending and receiving JDK differ, the object will not de-serialize properly on the receiving end.
The easist solution would be to use a common format to transmit the data. Say! That sounds like XML.
- Saish
"My karma ran over your dogma." - Anon