Description of problem:
I hit the following error when I try to run mortgage-demo based on DR4.
The issue is the same if I compile it based on community verison 6.2.0.Beta3 kie version.

[rzhang@/workspace/3jboss-bpm-example-app/mortgage-demo-client/target]$java -jar mortgage-demo-client-6.1.0-SNAPSHOT.jar quickstartUser quickstartPwd1!
Exception in thread "main" org.kie.services.client.serialization.SerializationException: Unable to marshall JaxbCommandsRequest instance.
at org.kie.services.client.serialization.JaxbSerializationProvider.serialize(JaxbSerializationProvider.java:292)
at org.kie.services.client.serialization.JaxbSerializationProvider.serialize(JaxbSerializationProvider.java:263)
at org.kie.services.client.api.command.AbstractRemoteCommandObject.executeRestCommand(AbstractRemoteCommandObject.java:381)
at org.kie.services.client.api.command.AbstractRemoteCommandObject.executeCommand(AbstractRemoteCommandObject.java:126)
at org.kie.services.client.api.command.KieSessionClientCommandObject.startProcess(KieSessionClientCommandObject.java:286)
at com.redhat.bpms.examples.mortgage.CreateProcesses.populateSamples(CreateProcesses.java:57)
at com.redhat.bpms.examples.mortgage.CreateProcesses.main(CreateProcesses.java:47)
Caused by: javax.xml.bind.MarshalException

• with linked exception:
  [com.sun.istack.SAXException2: class com.redhat.bpms.examples.mortgage.Application nor any of its super class is known to this context.
  javax.xml.bind.JAXBException: class com.redhat.bpms.examples.mortgage.Application nor any of its super class is known to this context.]
  at com.sun.xml.bind.v2.runtime.MarshallerImpl.write(MarshallerImpl.java:326)
  at com.sun.xml.bind.v2.runtime.MarshallerImpl.marshal(MarshallerImpl.java:251)
  at javax.xml.bind.helpers.AbstractMarshallerImpl.marshal(AbstractMarshallerImpl.java:116)
  at org.kie.services.client.serialization.JaxbSerializationProvider.serialize(JaxbSerializationProvider.java:290)
  ... 6 more
  Caused by: com.sun.istack.SAXException2: class com.redhat.bpms.examples.mortgage.Application nor any of its super class is known to this context.
  javax.xml.bind.JAXBException: class com.redhat.bpms.examples.mortgage.Application nor any of its super class is known to this context.
  at com.sun.xml.bind.v2.runtime.XMLSerializer.reportError(XMLSerializer.java:247)
  at com.sun.xml.bind.v2.runtime.XMLSerializer.reportError(XMLSerializer.java:262)
  at com.sun.xml.bind.v2.runtime.XMLSerializer.childAsXsiType(XMLSerializer.java:653)
  at com.sun.xml.bind.v2.runtime.property.SingleElementNodeProperty.serializeBody(SingleElementNodeProperty.java:158)
  at com.sun.xml.bind.v2.runtime.ClassBeanInfoImpl.serializeBody(ClassBeanInfoImpl.java:358)
  at com.sun.xml.bind.v2.runtime.XMLSerializer.childAsXsiType(XMLSerializer.java:696)
  at com.sun.xml.bind.v2.runtime.property.ArrayElementNodeProperty.serializeItem(ArrayElementNodeProperty.java:69)
  at com.sun.xml.bind.v2.runtime.property.ArrayElementProperty.serializeListBody(ArrayElementProperty.java:172)
  at com.sun.xml.bind.v2.runtime.property.ArrayERProperty.serializeBody(ArrayERProperty.java:159)
  at com.sun.xml.bind.v2.runtime.ClassBeanInfoImpl.serializeBody(ClassBeanInfoImpl.java:358)
  at com.sun.xml.bind.v2.runtime.XMLSerializer.childAsXsiType(XMLSerializer.java:696)
  at com.sun.xml.bind.v2.runtime.property.SingleElementNodeProperty.serializeBody(SingleElementNodeProperty.java:158)
  at com.sun.xml.bind.v2.runtime.ClassBeanInfoImpl.serializeBody(ClassBeanInfoImpl.java:358)
  at com.sun.xml.bind.v2.runtime.XMLSerializer.childAsXsiType(XMLSerializer.java:696)
  at com.sun.xml.bind.v2.runtime.property.ArrayElementNodeProperty.serializeItem(ArrayElementNodeProperty.java:69)
  at com.sun.xml.bind.v2.runtime.property.ArrayElementProperty.serializeListBody(ArrayElementProperty.java:172)
  at com.sun.xml.bind.v2.runtime.property.ArrayERProperty.serializeBody(ArrayERProperty.java:159)
  at com.sun.xml.bind.v2.runtime.ClassBeanInfoImpl.serializeBody(ClassBeanInfoImpl.java:358)
  at com.sun.xml.bind.v2.runtime.XMLSerializer.childAsSoleContent(XMLSerializer.java:593)
  at com.sun.xml.bind.v2.runtime.ClassBeanInfoImpl.serializeRoot(ClassBeanInfoImpl.java:340)
  at com.sun.xml.bind.v2.runtime.XMLSerializer.childAsRoot(XMLSerializer.java:494)
  at com.sun.xml.bind.v2.runtime.MarshallerImpl.write(MarshallerImpl.java:323)
  ... 9 more
  Caused by: javax.xml.bind.JAXBException: class com.redhat.bpms.examples.mortgage.Application nor any of its super class is known to this context.
  at com.sun.xml.bind.v2.runtime.JAXBContextImpl.getBeanInfo(JAXBContextImpl.java:588)
  at com.sun.xml.bind.v2.runtime.XMLSerializer.childAsXsiType(XMLSerializer.java:648)
  ... 28 more

Version-Release number of selected component (if applicable):

How reproducible:
jboss-bpm-example source: https://github.com/jboss-integration/jboss-bpm-example-app/tree/6.1.x

Steps to Reproduce:
1. Start DR4 bpm server
2. Add user: ./add-user.sh -a -u 'quickstartUser' -p 'quickstartPwd1!' -ro 'admin,analyst
3. followed steps in jboss-brms-bpm-quickstart/jboss-bpm-example-app/README.txt
4 The error occured when run against mortgage-demo-client
Actual results:

Expected results:

Additional info: