Name: dsR10051 Date: 10/18/2000


The java.applet.Applet object serialized under jdk1.3 fails to be
deserialized under jdk1.4 due to the incompatibility of the classon
jdk1.3 and jdk1.4 platforms.

Here is a minimized test:
import java.io.*;
import java.applet.*;

public class SomeBeanApplet2 {

    public static void main (String[] args) {
        Applet anObject = null;

        if (args[0].equals("write")) {
            anObject = new Applet();

            FileOutputStream file;
            ObjectOutputStream freezer;

            // create a test object
            anObject = new Applet();
            try {
                file = new FileOutputStream("Applet.ser");
                freezer = new ObjectOutputStream(file);
                freezer.writeObject( anObject );
                freezer.close();
            } catch (IOException noIO) {
                System.out.println("IO error occurred: " + noIO);
                System.exit(1);
            }
            System.exit(0);
        } else if (args[0].equals("read")) {
            FileInputStream file;
            ObjectInputStream freezer;

            try {
                file = new FileInputStream("Applet.ser");
                freezer = new ObjectInputStream(file);
                anObject = (Applet) freezer.readObject();
            } catch (IOException noIO) {
                System.out.println("IO error occurred: " + noIO);
                System.exit(1);
            } catch (ClassNotFoundException noClass) {
                System.out.println("Unexpected ClassNotFoundException: " + noClass);
                System.exit(1);
            }
            System.out.println("OKAY");
            System.exit(0);
        }
    }
}

--- Output ---
%/set/java/jdk1.3/solaris/bin/java SomeBeanApplet2 write
%/set/java/jdk1.4/solaris/bin/java SomeBeanApplet2 read
IO error occurred: java.io.OptionalDataException
%

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