How can I deserialize the object, if it was moved to another package or renamed?

by

It is possible:

class HackedObjectInputStream extends ObjectInputStream {

    public HackedObjectInputStream(InputStream in) throws IOException {
        super(in);
    }

    @Override
    protected ObjectStreamClass readClassDescriptor() throws IOException, ClassNotFoundException {
        ObjectStreamClass resultClassDescriptor = super.readClassDescriptor();

        if (resultClassDescriptor.getName().equals("oldpackage.Clazz"))
            resultClassDescriptor = ObjectStreamClass.lookup(newpackage.Clazz.class);

        return resultClassDescriptor;
    }
}

This also allows one to ignore serialVersionUIDs mismatch or even deserialize a class if its field structure was changed.

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