DESCRIPTION:
===========
Under jre5.0, an attempt to de-serialize an instance of the class javax.xml.namespace.QName, results in jvm throwing a java.io.InvalidClassException exception.

ROOT CAUSE:
==========
This issue is a result of the migration of javax.xml.namespace.QName
from J2EE1.4 to J2SE5.0; the exception is thrown as a result of a mismatch between the suid reported in the ojbect file ('qnameser.obj') and the suid hard-coded into QName. Namely, in J2SE 5.0, the serialVersionUID of javax.xml.namespace.QName is declared:

    private static final long serialVersionUID = 4418622981026545151L;

but in J2EE 1.4 this value is different.

JDK VERSION INFORMATION:
=======================
java version "1.5.0_03"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_03-b07)
Java HotSpot(TM) Server VM (build 1.5.0_03-b07, mixed mode)

INSTRUCTIONS TO RECREATE ISSUE:
==============================
The attached testcase and object file demonstrate the above issue. Run the test case by typing the following at the command line:
$java QNameSerialTest d qnameser.obj

NOTE: The file qnameser.obj was created using J2EE 1.4 and is available in the 'attachments' section.

EXCEPTION DETAILS:
=================
When trying to run the test case (QNameSerialTest.java) - the following exception occurs:

Failure during deserialization.
java.io.InvalidClassException: javax.xml.namespace.QName; local class incompatible: stream classdesc serialVersionUID = -9120448754896609940, local class serialVersionUID = 4418622981026545151
        at java.io.ObjectStreamClass.initNonProxy(ObjectStreamClass.java:519)
        at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1546)
        at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1460)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1693)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1299)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:339)
        at QNameSerialTest.main(QNameSerialTest.java:37)


TESTCASE:
========

import javax.xml.namespace.QName;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;

//Tests object serialization and deserialization of javax.xml.namepace.QName.

public class QNameSerialTest {
    public final static String TEST_QNAME = "{http://www.example.com}test";
    
    public static void main (String [] args) {
        if (args.length < 2) {
            printUsage();
            System.exit(1);
        }
        if ("s".equals(args[0])) {
            try {
                ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(args[1]));
                QName qname = QName.valueOf(TEST_QNAME);
                oos.writeObject(qname);
                oos.flush();
                oos.close();
                System.out.println("QName has been serialized to file: " + args[1]);
            }
            catch (IOException exc) {
                System.err.println("Failure during serialization.");
                exc.printStackTrace();
            }
        }
        else if ("d".equals(args[0])) {
            try {
                ObjectInputStream ois = new ObjectInputStream(new FileInputStream(args[1]));
                QName qname = (QName) ois.readObject();
                ois.close();
                System.out.println("Deserialization successful.");
                System.out.println("QName value: " + qname.toString());
            }
            catch (ClassNotFoundException exc) {
                System.err.println("Failure during deserialization.");
                exc.printStackTrace();
            }
            catch (IOException exc) {
                System.err.println("Failure during deserialization.");
                exc.printStackTrace();
            }
        }
        else {
            printUsage();
            System.exit(1);
        }
    }
    
    public static void printUsage() {
        System.err.println("Usage: java QNameSerialTest [s|d] file");
        System.err.println("s - serialize");
        System.err.println("d - deserialize");
    }
}
###@###.### 2005-05-09 13:40:48 GMT
###@###.### 2005-05-23 23:46:55 GMT
###@###.### 2005-05-24 00:33:42 GMT