During the pairwise testing of policy-distribution, sdc & apex-pdp, we found a bug in distributor due to which malformed XML was being sent to apex-pdp for updating the policy. And due to which the parser in apex use to fail.

Below is the error log for the same.

2018-10-10 16:01:56,457 100129449 [procId=processId_IS_UNDEFINED] [Thread-17] ERROR

                o.o.p.a.s.e.r.i.EngineServiceImpl - failed to unmarshal the apex model on engine service PolicyApexPDPEngine:0.0.1

org.onap.policy.apex.model.basicmodel.handling.ApexModelException: Unable to unmarshal Apex concept

        at org.onap.policy.apex.model.basicmodel.handling.ApexModelReader.read(ApexModelReader.java:205)

        at org.onap.policy.apex.model.basicmodel.handling.ApexModelReader.read(ApexModelReader.java:174)

        at org.onap.policy.apex.model.basicmodel.handling.ApexModelReader.read(ApexModelReader.java:150)

        at org.onap.policy.apex.service.engine.runtime.impl.EngineServiceImpl.updateModel(EngineServiceImpl.java:273)

        at org.onap.policy.apex.service.engine.engdep.EngDepMessageListener.handleUpdateModelMessage(EngDepMessageListener.java:293)

        at org.onap.policy.apex.service.engine.engdep.EngDepMessageListener.handleIncomingMessages(EngDepMessageListener.java:232)

        at org.onap.policy.apex.service.engine.engdep.EngDepMessageListener.handleMessage(EngDepMessageListener.java:203)

        at org.onap.policy.apex.service.engine.engdep.EngDepMessageListener.pollAndHandleMessage(EngDepMessageListener.java:167)

        at org.onap.policy.apex.service.engine.engdep.EngDepMessageListener.run(EngDepMessageListener.java:154)

        at java.lang.Thread.run(Thread.java:748)

Caused by: javax.xml.bind.UnmarshalException: null

        at org.eclipse.persistence.jaxb.JAXBUnmarshaller.handleXMLMarshalException(JAXBUnmarshaller.java:1110)

        at org.eclipse.persistence.jaxb.JAXBUnmarshaller.unmarshal(JAXBUnmarshaller.java:351)

        at org.onap.policy.apex.model.basicmodel.handling.ApexModelReader.read(ApexModelReader.java:201)

        ... 9 common frames omitted

Caused by: org.eclipse.persistence.exceptions.XMLMarshalException:

Exception Description: An error occurred unmarshalling the document

Internal Exception: org.xml.sax.SAXParseException; lineNumber: 7496; columnNumber: 19; unexpected element (uri:"", local:"key"). Expected elements are <{http://www.onap.org/policy/apex-pdp}key>,<{http://www.onap.org/policy/apex-pdp}albums>