[Simple-support] TransformException

[Karthik K. <ka...@on...>]

Hi,

I am having trouble with serialization of an inner element of an object. 
Here is some example code to show what is not working:

@Root
public class SerializationWrapper <T>
{
    @Element
    private T _wrapped;
   
    public SerializationWrapper(T object) {
        _wrapped = object;
    }
   
    public T getInner() {
        return _wrapped;
    }
}

public abstract class Packet
{
    // basic Packet methods
}

@Root
public class MessagePacket extends Packet
{
    @Element(name="message")
    private String         _message;
   
    public MessagePacket(String message)
    {
        _message = message;
    }
   
    public String getMessage() {
        return _message;
    }
}

Packet p = new MessagePacket("test");
SerializationWrapper<Packet> wrapper = new SerializationWrapper<Packet>(p);

*Serialization of p itself gives valid XML:*
    <messagePacket>
       <message>test</message>
    </messagePacket>

*However, trying to serialize wrapper produces the following 
exception/stack trace:*

org.simpleframework.xml.transform.TransformException: Transform of class 
com.vandul.messaging.packets.MessagePacket not supported
    at 
org.simpleframework.xml.transform.PackageMatcher.match(PackageMatcher.java:91)
    at 
org.simpleframework.xml.transform.DefaultMatcher.matchType(DefaultMatcher.java:111)
    at 
org.simpleframework.xml.transform.DefaultMatcher.match(DefaultMatcher.java:90)
    at 
org.simpleframework.xml.transform.Transformer.write(Transformer.java:129)
    ...

This occurs even if I remove the abstraction and make 
SerializationWrapper's generic type a MessagePacket:

SerializationWrapper<MessagePacket> wrapper2 = new 
SerializationWrapper<MessagePacket>((MessagePacket) p);

Any help with this would be greatly appreciated. Thanks,

Karthik