JAXRS How to define/use Multiparts with Json + xs:base64Binary

[J. Fiala]

Hello,

I defined a Multipart in the WADL (I'd like to use a multipart with both 
json data + binary data):

<resource path="/createMultipart">
                <method name="POST">
                    <request>
                        <param name="name" style="query" 
type="xs:string" required="true"/>
                        <representation mediaType="application/json" 
element="mytypes:CreateMultipartRequestType"/>
                    </request>
                    <response status="200">
                        <representation mediaType="application/json" 
element="xs:string"/>
                    </response>
                </method>
            </resource>

<xs:complexType name="CreateMultipartRequestType">
        <xs:sequence>
            <xs:element name="requestModel" 
type="mytypes:CreateRequestType" />
            <xs:element name="payload" type="xs:base64Binary" 
xmime:expectedContentTypes="application/octet-stream"/>
        </xs:sequence>
    </xs:complexType>

<xs:complexType name="CreateRequestType">
        <xs:sequence>
            <xs:element minOccurs="1" name="description" 
type="xs:string" />
</xs:sequence>

</xs:complexType>

The generated Java code looks fine:

@POST
    @Consumes("application/json")
    @Produces({"application/json" })
    @Path("/createMultipart")
    String postCreateMultipart(@QueryParam("name") String name, 
CreateRequestType createRequestType);

public class CreateMultipartRequestType {

    @XmlElement(required = true)
    @NotNull
    @Valid
    protected CreateRequestType requestModel;
    @XmlElement(required = true)
    @XmlMimeType("application/octet-stream")
    @NotNull
    protected DataHandler payload;

}

However, when I try to invoke the service using JacksonProvider, I get:

WARNING: Interceptor for {http://myns/}MyResource has thrown exception, 
unwinding now
org.apache.cxf.interceptor.Fault: No message body writer has been found 
for class at.hello.CreateMultipartRequestType, ContentType: application/json

Any idea how I have to specify the Multipart in the WADL to get it working?

Best regards,
Johannes