I am encountering an error while demarshalling a JSON object as input
to a JAX-RS method. After some tinkering, the error seems to be due to
the XmlNsMap defined for the output not being applied to the input.
org.jboss.resteasy.plugins.providers.jaxb.JAXBUnmarshalException:
javax.xml.bind.UnmarshalException
- with linked exception:
[com.sun.istack.SAXParseException2; columnNumber: 0; unexpected
element (uri:"", local:"ejava.link"). Expected elements are
<{http://ejava.info}link>]
Is there something similar to the ContextResolver<JAXBContext> that
has to be done for JSON XmlNsMaps?
The RESTEasy JSON examples generate data (which I can do) but none
consume data. I have gotten it to work by injecting a String and
demarshalling the object thru the Jettison APIs. I can also get the
manual approach to generate the same error message -- which leads me
to think the input/demarshaller for JSON needs more than the @Mapped
annotation.
* I am working with a simple Link class in the "http://ejava.info"; namespace.
package ejava.util.rest;
@XmlRootElement(name="link", namespace="http://ejava.info";)
@XmlType(name="LinkType", namespace="http://ejava.info";)
public class Link {
...
}
* I have attempted to pass the JSON object straight into the method
and have RESTEasy do the demarshalling. I have added the
@Mapped/@XmlNsMap annotations for the used namespace. This has allowed
me to generate Link objects successfully.
@PUT @Path("attributes")
@Consumes(MediaType.APPLICATION_JSON)
@Produces(MediaType.APPLICATION_JSON)
@Mapped(namespaceMap = {
@XmlNsMap(namespace = "http://ejava.info";, jsonName = "ejava"),
})
public Response putLinkJSON(Link link) //String jsonString)
throws JSONException, XMLStreamException, JAXBException {
link.setHref(uriInfo.getRequestUri());
link.setType(MediaType.APPLICATION_XML);
return Response.ok(link, MediaType.APPLICATION_JSON).build();
}
* When I PUT my JSON object to the method...
PUT /jaxrs-representations-dmv-war6/data/attributes HTTP/1.1
Content-Type: application/json
Accept: application/json
Content-Length: 30
Host: dmv.ejava.info:9092
Connection: Keep-Alive
User-Agent: Apache-HttpClient/4.1.3 (java 1.5)
{"ejava.link":{"@rel":"self"}}
... it reports the following error
-Failed executing PUT /data/attributes
org.jboss.resteasy.plugins.providers.jaxb.JAXBUnmarshalException:
javax.xml.bind.UnmarshalException
- with linked exception:
[com.sun.istack.SAXParseException2; columnNumber: 0; unexpected
element (uri:"", local:"ejava.link"). Expected elements are
<{http://ejava.info}link>]
at
org.jboss.resteasy.plugins.providers.jaxb.AbstractJAXBProvider.readFrom(AbstractJAXBProvider.java:125)
* When I inject the JSON object into a String and manually demarshal
the JSON. It works (see the 200 reply below)
@PUT @Path("attributes")
@Consumes(MediaType.APPLICATION_JSON)
@Produces(MediaType.APPLICATION_JSON)
@Mapped(namespaceMap = {
@XmlNsMap(namespace = "http://ejava.info";, jsonName = "ejava"),
})
public Response putLinkJSON(String jsonString)
throws JSONException, XMLStreamException, JAXBException {
JAXBContext ctx = JAXBContext.newInstance(Link.class);
Configuration config = new Configuration();
Map<String, String> xmlToJsonNamespaces = new HashMap<String,String>();
xmlToJsonNamespaces.put("http://ejava.info";, "ejava");
config.setXmlToJsonNamespaces(xmlToJsonNamespaces);
MappedNamespaceConvention con = new MappedNamespaceConvention(config);
JSONObject obj = new JSONObject(jsonString);
XMLStreamReader xmlStreamReader = new MappedXMLStreamReader(obj, con);
Unmarshaller unmarshaller = ctx.createUnmarshaller();
Link link = (Link) unmarshaller.unmarshal(xmlStreamReader);
link.setHref(uriInfo.getRequestUri());
link.setType(MediaType.APPLICATION_XML);
return Response.ok(link, MediaType.APPLICATION_JSON).build();
}
HTTP/1.1 200 OK
Content-Type: application/json
Transfer-Encoding: chunked
Server: Jetty(6.1.26)
{"ejava.link":{"@href":"http:\/\/dmv.ejava.info:9092\/jaxrs-representations-dmv-war6\/data\/attributes","@rel":"self","@type":"application\/xml"}}
* When I comment out the Map in the working code...
Map<String, String> xmlToJsonNamespaces = new HashMap<String,String>();
//xmlToJsonNamespaces.put("http://ejava.info";, "ejava");
config.setXmlToJsonNamespaces(xmlToJsonNamespaces);
...I get an error message similar to the one from the original case.
[com.sun.istack.SAXParseException2; columnNumber: 0; unexpected
element (uri:"", local:"ejava.link"). Expected elements are
<{http://ejava.info}link>]
at
com.sun.xml.bind.v2.runtime.unmarshaller.UnmarshallerImpl.handleStreamException(UnmarshallerImpl.java:434)
at
com.sun.xml.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal0(UnmarshallerImpl.java:371)
at
com.sun.xml.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal(UnmarshallerImpl.java:341)
at
ejava.examples.jaxrsrep.handlers.JSONHandlerDemoRS.putLinkJSON(JSONHandlerDemoRS.java:100)
This leads me to think that I need to register something similar to
the ContextResolver that I have done for other JAXB cases -- however,
I haven't located any documentation on how I can help setup the
Jettison demarshaller.
ideas?
thanks,
jim
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