Local class incompatible: different serialVersionUID

Question

Hi!
I wrote an Object of type X to a file (in the server) and am sending the file to a client. This is done using:
FileOutputStream fo = new FileOutputStream (filename);
ObjectOutputStream so = new ObjectOutputStream (fo);
so.writeObject(x); //x is of Object type X
so.flush();
so.close();
fo.close();
The file 'filename' is sent to the client and I read it as follows:
FileInputStream in = new FileInputStream(filename);
ObjectInputStream s = new ObjectInputStream(in);
xobject = (X) x.readObject(); //xobject is of Object type X
This is throwing an error as follows:
java.util.Vector; local class incompatible:stream classdesc serialVersionUID = -2804478835259887871, local class serialVersionUID = -2767605614048989439
Can anyone tell me what to do to be able to type cast the object and use it? I did go thro' some @serial documentation, but, couldn't understand it.
Please help,
Thanks,
x86

Answer 1

...or, alternatively, maintain the X class in one package, the one where your server-side classes are compiled, say, and import it into the second, client side source code, which presumably lives in a separate package or this problem probably wouldn't have come up. The goal is never to have more than one copy of the compiled class file.
You may have to modify your classpath.
Hi!
I wrote an Object of type X to a file (in theserver)
and am sending the file to a client. This is done
using:
<snip>
>
This is throwing an error as follows:
java.util.Vector; local class incompatible:stream
classdesc serialVersionUID = -2804478835259887871,
local class serialVersionUID = -2767605614048989439Hi
try using one copy of the compiled class for the
server
and the client, I had this happen many times until I
figured out
the server compiled its version of the serialiable
class and the client compiled its version of the
serialiable class,
then got class incompatable exceptions..among others
easy way around this is to compile the code of botht
he client and server, then copy the class code across
to the client side
Boris