Hi Paul,
Thank you very much for your response. I am new to Jersey and JSON, so I apologise if I have misunderstood but by creating a custom ContextResolver (as you suggested), I have been able to un-marshal the diagram objects correctly, but I have had to use the badgerfish notation (example below). I would prefer not to use badgerfish if possible, should it be possible to marshal/un-marshal this object with the default notation?
@Provider
public class DiagramJAXBContextProvider implements ContextResolver<JAXBContext> {
private JAXBContext context;
private Class[] types = { Diagram.class };
public DiagramJAXBContextProvider() throws Exception {
this.context = new JSONJAXBContext(JSONConfiguration.badgerFish().build(),
types);
}
public JAXBContext getContext(Class<?> objectType) {
for (Class type : types) {
if (type.equals(objectType))
return context;
}
return null;
}
}
Thanks again,
Peter
-----Original Message-----
From: Paul Sandoz [mailto:Paul.Sandoz_at_oracle.com]
Sent: 09 September 2010 10:55
To: users_at_jersey.dev.java.net
Cc: Peter Hill
Subject: Re: [Jersey] Error when unmarshalling abstract property via JSON
Hi Peter,
I think this is because in the absence of you providing a JAXB context Jersey creates a JAXB context from the Diagram class, which may not have all the necessary information about the concrete types.
So you may need to implement a ContextResolver<JAXBContext>. See here:
https://jersey.dev.java.net/nonav/documentation/1.4-SNAPSHOT/user-guide.html
#d4e848
Pavel, i think we need to explain in the documentation what the
default behavior is for Jersey, and also explain why one might need to
use ContextResolver<JAXBCOntext>. Also JAXBContext<Marshaller>
JAXBContext<Unmarshaller> are also supported, and these are
advantageous when properties need to be set when un/marshaling. (As
you know we also need to document support for List<T>).
Paul.
On Sep 7, 2010, at 5:12 PM, Peter Hill wrote:
> Hi,
>
> I am having trouble un-marshalling a list of objects when the object
> type in the list has a property which is defined as an abstract class.
>
> Below is how the classes are defined. Have I done this correctly?
> The server appears to create valid syntax. I have searched the
> internet for the last couple of days but cannot seem to find a
> solution. If I switch the transport protocol to XML I do not have
> this problem, but unfortunately I cannot use this in production.
>
> I have also included a test case which should show the error.
>
> @XmlRootElement(name="diagram")
> public class Diagram {
>
> private Shape shape;
>
> public Diagram() {
> super();
> }
>
> public Diagram(Shape shape) {
> super();
> this.shape = shape;
> }
>
> public Shape getShape() {
> return shape;
> }
>
> public void setShape(Shape shape) {
> this.shape = shape;
> }
>
> }
>
> @XmlRootElement
> @XmlSeeAlso({Square.class, Circle.class})
> public abstract class Shape {
>
> ..
>
> }
>
> @XmlRootElement
> public class Circle extends Shape {
>
> ..
>
> }
>
> Error:
> [javax.xml.bind.UnmarshalException: Unable to create an instance of
> com.diagrams.Shape
>
> I am using the latest jersey server and client jars to do this,
> running on Jboss 5.1. All other classes are communicated between the
> client and server seamlessly.
>
> Any help or guidance would be greatly appreciated.
>
> Many thanks,
> Peter
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