How to validate enum values in CXF/JAXB ?

Issue

• When upgrading from Fuse 6.0 to 6.1.1, CXF / JAXB no longer seems to validate enum values. In Fuse 6, we would see a response similar to:

<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
   <soap:Header/>
   <soap:Body>
      <soap:Fault>
         <faultcode>soap:Client</faultcode>
         <faultstring>Unmarshalling Error: cvc-enumeration-valid: Value 'invalidenum' is not facet-valid with respect to enumeration '[valueOne, valueTwo, valueThree, valueFour]'. It must be a value from the enumeration.</faultstring>
      </soap:Fault>
   </soap:Body>
</soap:Envelope>

• In Fuse 6.1.1, the request gets through validation and unmarshals to the underlying JAXB object. It seems that if the enumeration value is invalid, then the element is simply ignored.

• How can be validate the enum values by default in cxf ?