kie JMS client does not work due to: java.util.Map is an interface, and JAXB can't handle interfaces.

Kie JMS API client does not work. Pasting the relevant error message (see also the attached perfcake.log):

java.util.Map is an interface, and JAXB can't handle interfaces.
this problem is related to the following location:
at java.util.Map
at private java.util.Map org.kie.services.client.serialization.jaxb.impl.process.JaxbProcessInstanceWithVariablesResponse.variables
at org.kie.services.client.serialization.jaxb.impl.process.JaxbProcessInstanceWithVariablesResponse
java.util.Map does not have a no-arg default constructor.
this problem is related to the following location:
at java.util.Map
at private java.util.Map org.kie.services.client.serialization.jaxb.impl.process.JaxbProcessInstanceWithVariablesResponse.variables
at org.kie.services.client.serialization.jaxb.impl.process.JaxbProcessInstanceWithVariablesResponse

To reproduce:
1.) Download BPMS 6 ER5 and merge it with EAP 6.1.1 distribution.
2.) Add user guest, password guest into EAP config files:
application-users.properties: guest=b5d048a237bfd2874b6928e1f37ee15e
application-roles.properties: guest=kie-user,admin
standalone.xml: make sure that JMS subsystem queue roles include role 'admin'
3.) Setup datasource for BPMS, I used PostgreSQL. Make sure the db is empty before the test. Do not use the default H2.
4.) Start the server and go to http://localhost:8080/business-central.
5.) Clone repository git://git.app.eng.bos.redhat.com/bpms-assets.git to your BPMS installation.
6.) Build&Deploy a project bpms-perf from the bpms-assets.git repo.
7.) Run perf scenario:
git clone git://git.app.eng.bos.redhat.com/jbossqe-process-flood.git
cd jbossqe-process-flood/bpms-6.x
./execute_scenario.sh -Dscenario=Timer_kieJMS

This bug prevents to create complete performance report, as it now looks like that new report will be without whole JMS API.

My env:
BPMS 6 ER5
EAP 6.1.1
PostgreSQL 9.1.9
postgresql-9.1-902.jdbc4.jar