Testing QName Serialisation

QNameTester.java

/*
 * QNameTester.java
 * created at 2020-06-10 by Bernd Eckenfels
 * Copyright (c) SEEBURGER AG, Germany. All Rights Reserved.
 * This code is under the Apache Software License (ASL2.0).
 */
package test;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.ObjectStreamClass;
import java.util.Base64;

import javax.xml.namespace.QName;

public class QNameTester
{
    static String compatB64 = "rO0ABXNyABlqYXZheC54bWwubmFtZXNwYWNlLlFOYW1lPVIaMLx2_f8CAANMAAlsb2NhbFBhcnR0ABJMamF2YS9sYW5nL1N0cmluZztMAAxuYW1lc3BhY2VVUklxAH4AAUwABnByZWZpeHEAfgABeHB0AAViZXJuZHQAFGh0dHA6Ly9lY2tlbmZlbHMubmV0dAAA";
    static String defaultB64= "rO0ABXNyABlqYXZheC54bWwubmFtZXNwYWNlLlFOYW1lgW2oLfw73WwCAANMAAlsb2NhbFBhcnR0ABJMamF2YS9sYW5nL1N0cmluZztMAAxuYW1lc3BhY2VVUklxAH4AAUwABnByZWZpeHEAfgABeHB0AAViZXJuZHQAFGh0dHA6Ly9lY2tlbmZlbHMubmV0dAAA";

    public static void main(String[] args) throws NoSuchFieldException, SecurityException, IllegalArgumentException, IllegalAccessException, IOException
    {
        System.setProperty("com.sun.xml.namespace.QName.useCompatibleSerialVersionUID", "1.0");

        System.out.printf("Runtime: %s %s/%s on %s %s%n", System.getProperty("java.vm.name"),
                          System.getProperty("java.runtime.version"),
                          System.getProperty("java.vm.version"),
                          System.getProperty("os.name"),
                          System.getProperty("os.version"));

        System.out.printf(" com.sun.xml.namespace.QName.useCompatibleSerialVersionUID=%s%n", System.getProperty("com.sun.xml.namespace.QName.useCompatibleSerialVersionUID", "N/A"));

        long uid = ObjectStreamClass.lookup(QName.class).getSerialVersionUID();

        QName qname = new QName("http://eckenfels.net", "bernd");

        System.out.printf("Created QName: %s  with UID %d%n",  String.valueOf(qname), uid);

        // serialize current object version
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        ObjectOutputStream oos = new ObjectOutputStream(bos);
        oos.writeObject(qname);
        oos.close();
        System.out.printf("Serialized: %s%n", Base64.getUrlEncoder().encodeToString(bos.toByteArray()));

        // test the recorded object versions
        System.out.printf("%nDeserialize Old%n");
        deser(compatB64);
        System.out.printf("%nDeserialize Default%n");
        deser(defaultB64);
    }

    /** Deserialize given base64 string with default and custom method. */
    private static void deser(String b64) throws IOException
    {
        byte[] serBytes = Base64.getUrlDecoder().decode(b64);

        // default deserialisation
        try (ObjectInputStream ois = new ObjectInputStream(new ByteArrayInputStream(serBytes)))
        {
            Object o = ois.readObject();
            System.out.println(" Default OIS read: " + o.toString());
        } catch (Exception e) {
            System.out.println(" Default OIS failed: " + e);
        }

        // extended deserialization
        try (ObjectInputStream ois = new MyObjectInputStream(new ByteArrayInputStream(serBytes)))
        {
            Object o = ois.readObject();
            System.out.println(" My OIS read: " + o.toString());
        } catch (Exception e) {
            System.out.println(" My OIS failed: " + e);
            e.printStackTrace();
        }
    }

}

class MyObjectInputStream extends ObjectInputStream
{
    public MyObjectInputStream(InputStream is) throws IOException
    {
        super(is);
    }

    @Override
    protected ObjectStreamClass readClassDescriptor()
        throws IOException, ClassNotFoundException
    {
        ObjectStreamClass d = super.readClassDescriptor();
        // overwrite any QName descriptor with the current local one
        if ("javax.xml.namespace.QName".equals(d.getName()))
            return ObjectStreamClass.lookup(QName.class);
        else
            return d;
    }
}

Z_Sample Outputs 11.txt

Runtime: OpenJDK 64-Bit Server VM 11.0.1+13-LTS/11.0.1+13-LTS on Windows 10 10.0
 com.sun.xml.namespace.QName.useCompatibleSerialVersionUID=N/A
Created QName: {http://eckenfels.net}bernd  with UID -9120448754896609940
Serialized: rO0ABXNyABlqYXZheC54bWwubmFtZXNwYWNlLlFOYW1lgW2oLfw73WwCAANMAAlsb2NhbFBhcnR0ABJMamF2YS9sYW5nL1N0cmluZztMAAxuYW1lc3BhY2VVUklxAH4AAUwABnByZWZpeHEAfgABeHB0AAViZXJuZHQAFGh0dHA6Ly9lY2tlbmZlbHMubmV0dAAA

Deserialize Old
 Default OIS failed: java.io.InvalidClassException: javax.xml.namespace.QName; local class incompatible: stream classdesc serialVersionUID = 4418622981026545151, local class serialVersionUID = -9120448754896609940
 My OIS read: {http://eckenfels.net}bernd

Deserialize Default
 Default OIS read: {http://eckenfels.net}bernd
 My OIS read: {http://eckenfels.net}bernd


Runtime: OpenJDK 64-Bit Server VM 11.0.1+13-LTS/11.0.1+13-LTS on Windows 10 10.0
 com.sun.xml.namespace.QName.useCompatibleSerialVersionUID=1.0
Created QName: {http://eckenfels.net}bernd  with UID -9120448754896609940
Serialized: rO0ABXNyABlqYXZheC54bWwubmFtZXNwYWNlLlFOYW1lgW2oLfw73WwCAANMAAlsb2NhbFBhcnR0ABJMamF2YS9sYW5nL1N0cmluZztMAAxuYW1lc3BhY2VVUklxAH4AAUwABnByZWZpeHEAfgABeHB0AAViZXJuZHQAFGh0dHA6Ly9lY2tlbmZlbHMubmV0dAAA

Deserialize Old
 Default OIS failed: java.io.InvalidClassException: javax.xml.namespace.QName; local class incompatible: stream classdesc serialVersionUID = 4418622981026545151, local class serialVersionUID = -9120448754896609940
 My OIS read: {http://eckenfels.net}bernd

Deserialize Default
 Default OIS read: {http://eckenfels.net}bernd
 My OIS read: {http://eckenfels.net}bernd

Z_Sample Outputs 8.txt

Runtime: OpenJDK 64-Bit Server VM 1.8.0_212-b04/25.212-b04 on Windows 10 10.0
 com.sun.xml.namespace.QName.useCompatibleSerialVersionUID=N/A
Created QName: {http://eckenfels.net}bernd  with UID -9120448754896609940
Serialized: rO0ABXNyABlqYXZheC54bWwubmFtZXNwYWNlLlFOYW1lgW2oLfw73WwCAANMAAlsb2NhbFBhcnR0ABJMamF2YS9sYW5nL1N0cmluZztMAAxuYW1lc3BhY2VVUklxAH4AAUwABnByZWZpeHEAfgABeHB0AAViZXJuZHQAFGh0dHA6Ly9lY2tlbmZlbHMubmV0dAAA

Deserialize Old
 Default OIS failed: java.io.InvalidClassException: javax.xml.namespace.QName; local class incompatible: stream classdesc serialVersionUID = 4418622981026545151, local class serialVersionUID = -9120448754896609940
 My OIS read: {http://eckenfels.net}bernd

Deserialize Default
 Default OIS read: {http://eckenfels.net}bernd
 My OIS read: {http://eckenfels.net}bernd



Runtime: OpenJDK 64-Bit Server VM 1.8.0_212-b04/25.212-b04 on Windows 10 10.0
 com.sun.xml.namespace.QName.useCompatibleSerialVersionUID=1.0
Created QName: {http://eckenfels.net}bernd  with UID 4418622981026545151
Serialized: rO0ABXNyABlqYXZheC54bWwubmFtZXNwYWNlLlFOYW1lPVIaMLx2_f8CAANMAAlsb2NhbFBhcnR0ABJMamF2YS9sYW5nL1N0cmluZztMAAxuYW1lc3BhY2VVUklxAH4AAUwABnByZWZpeHEAfgABeHB0AAViZXJuZHQAFGh0dHA6Ly9lY2tlbmZlbHMubmV0dAAA

Deserialize Old
 Default OIS read: {http://eckenfels.net}bernd
 My OIS read: {http://eckenfels.net}bernd

Deserialize Default
 Default OIS failed: java.io.InvalidClassException: javax.xml.namespace.QName; local class incompatible: stream classdesc serialVersionUID = -9120448754896609940, local class serialVersionUID = 4418622981026545151
 My OIS read: {http://eckenfels.net}bernd