opendaylight : getting flow statistics from a java applicaton fails - opendaylight

Question

I am trying to read flow statistics from a java opendaylight application (run's as a karaf feature).
I see the following exception in my Java application (running as an opendaylight feature):
java.util.concurrent.ExecutionException: org.opendaylight.controller.md.sal.dom.api.DOMRpcImplementationNotAvailableException:
No implementation of RPC AbsoluteSchemaPath{path=[(urn:opendaylight:flow:statistics?revision=2013-08-19)get-aggregate-flow-statistics-from-flow-table-for-given-match]} available
The following features are installed in my container:
karaf> feature:list | grep openflow
odl-openflowplugin-app-forwardingrules-manager | 0.5.1 | | Started | odl-openflowplugin-app-forwardingrules-manager | OpenDaylight :: Openflow Plugin :: Application -
odl-openflowplugin-nxm-extensions | 0.5.1 | | Started | odl-openflowplugin-nxm-extensions | OpenDaylight :: Openflow Plugin :: Nicira Extensi
odl-openflowplugin-nsf-model | 0.5.1 | | Started | odl-openflowplugin-nsf-model | OpenDaylight :: OpenflowPlugin :: NSF :: Model
odl-openflowplugin-app-config-pusher | 0.5.1 | | Started | odl-openflowplugin-app-config-pusher | OpenDaylight :: Openflow Plugin :: Application -
odl-openflowplugin-southbound | 0.5.1 | | Started | openflowplugin-0.5.1 | OpenDaylight :: Openflow Plugin :: Li southbound
odl-openflowjava-protocol | 0.5.1 | | Started | odl-openflowjava-0.5.1 | ODL :: o openflowjava :: odl-openflowjava-protocol
odl-openflowplugin-app-topology | 0.5.1 | | Started | odl-openflowplugin-app-topology | OpenDaylight :: Openflow Plugin :: Application -
odl-openflowplugin-flow-services | 0.5.1 | | Started | odl-openflowplugin-flow-services | OpenDaylight :: Openflow Plugin :: Flow Services
odl-openflowplugin-app-reconciliation-framework | 0.5.1 | | Started | odl-openflowplugin-app-reconciliation-framework | OpenDaylight :: Openflow Plugin :: Application -
What service gets invoked in opendaylight when I issue the following REST RPC call?
curl -v -u admin:admin -X GET http://localhost:8181/restconf/operational/opendaylight-inventory:nodes/node/openflow:1/table/0
My goal is to do the same thing from an opendaylight java application ( running as a service in the container), but I don't know how to do that.
Not sure if I am following the right approach.
Thanks, Ranga

Answer 1

Figured out the answer (for nitrogen release of ODL). The error message in the exception is confusing. Here's how to do it:
In the code snippet below node is of type InstanceIdentifier
InstanceIdentifier outNode = node.firstIdentifierOf(Node.class);
NodeRef nodeRef = new NodeRef(outNode);
GetFlowStatisticsInputBuilder inputBuilder = new GetFlowStatisticsInputBuilder();
inputBuilder.setFlowName(flow.getFlowName());
inputBuilder.setMatch(flow.getMatch());
inputBuilder.setTableId(flow.getTableId());
inputBuilder.setInstructions(flow.getInstructions());
inputBuilder.setNode(nodeRef);
GetFlowStatisticsOutput output = directStatisticsService
.getFlowStatistics(inputBuilder.build()).get().getResult();
Hope this helps somebody.