[rules-users] Does Knowledgebase partitioning work at all?

I am attempting to use the multi thread knowledgebase partitioning feature on drools 5.1, but am not having much luck. Using a stateless session with MultithreadEvaluationOption.YES and MaxThreadsOption.get(2) always gives a NullPointer exception: java.lang.NullPointerException at org.drools.reteoo.PartitionManager.waitForPendingTasks(PartitionManager.java:105) at org.drools.common.AbstractWorkingMemory.prepareToFireActivation(AbstractWorkingMemory.java:2090) at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:845) at org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1071) at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:785) at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:751) at org.drools.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:218) at org.drools.impl.StatelessKnowledgeSessionImpl.execute(StatelessKnowledgeSessionImpl.java:302) at com.sample.DroolsTest.main(DroolsTest.java:70) This looks similar to JIRA 2125, which was raised over a year ago. Does this mean that this feature is completely non-functional? Thanks, Tim