of-flow: unable to add flows using add-flow sal service (avoiding config data store)

i am unable to install flows on the switch using sal service add-flow
http status 500 is returned

odl: http://nexus.opendaylight.org/content/repositories/opendaylight.snapshot/org/opendaylight/integration/distribution-karaf/0.3.0-SNAPSHOT//distribution-karaf-0.3.0-20150420.104737-1160.tar.gz

used default settings (heap, perm size)

installed feature: odl-openflowplugin-flow-services-rest

host VM: fedora 18 with 16G of ram

java -version
java version "1.7.0_67"
Java(TM) SE Runtime Environment (build 1.7.0_67-b01)
Java HotSpot(TM) 64-Bit Server VM (build 24.65-b04, mixed mode)

steps to reproduce
1) download, unzip odl
2) ./bin/start
3) install odl-openflowplugin-flow-services-rest feature

4) run tests (e.g. use integration git; use ips according to your env settings)

pybot -v CONTROLLER:10.25.2.9 -v MININET:127.0.0.1 -v MININET_USER:mininet -v USER_HOME:/home/mininet -v RESTCONFPORT:8181 -v PORT:8181 -v TOPO_TREE_DEPTH:1 tools/OF_Test/robot_suites/075__Flows_OF13_Stat_Manager_extende