Unmarshalling error when using collections of subtypes with the
StaxTransformFeature and 'out' transformations
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Key: CXF-3958
URL: https://issues.apache.org/jira/browse/CXF-3958
Project: CXF
Issue Type: Bug
Components: Configuration, Core, JAXB Databinding
Affects Versions: 2.5, 2.4
Reporter: Gareth Powell
Priority: Blocker
Attachments: cxf-versioning-bug.zip
We are using the StaxTransformFeature to aid with the versioning of a number or
our web services but have hit upon a problem when invoking a web method that
returns a collection of subtypes. When the StaxTransformFeature (specifically,
the out element transforms) are used, the resultant SOAP payload is malformed,
and JAXB cannot unmarshall the collection. Below is an example of the payload
we get back:
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/";
xmlns:xsi="xsi">
<soap:Body>
<ns2:getVehiclesResponse xmlns:ns2="example-1.0">
<vehicles>
<vehicle xsi:type="ns2:bicycle"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";>
<name>Marin</name>
</vehicle>
<vehicle xsi:type="ns2:car">
<name>Ferrari</name>
</vehicle>
<vehicle xsi:type="ns2:motorcycle">
<name>Yamaha</name>
</vehicle>
</vehicles>
</ns2:getVehiclesResponse>
</soap:Body>
</soap:Envelope>
When we invoke the same service, but without the StaxTransformFeature, then we
get correct xml and JAXB is happy. A correct payload is shown below. As you can
clearly see, the difference between the two is that the correct one includes
'xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";' for each instance of
the subtype, whereas the broken one, only has it for the first element in the
collection. I have attached a sample project in a zip file that demonstrated
the problem. It's a simple maven project, so just run 'mvn test' to see the
test failure.
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/";>
<soap:Body>
<ns2:getVehiclesResponse xmlns:ns2="example-1.0">
<vehicles>
<vehicle xsi:type="ns2:bicycle"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";>
<name>Marin</name>
</vehicle>
<vehicle xsi:type="ns2:car"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";>
<name>Ferrari</name>
</vehicle>
<vehicle xsi:type="ns2:motorcycle"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";>
<name>Yamaha</name>
</vehicle>
</vehicles>
</ns2:getVehiclesResponse>
</soap:Body>
</soap:Envelope>
This is a BLOCKER issue for us at the moment and we require urgent resolution.
Can you please advise as to whether there is something we can do to either
correct or work around the problem.
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