[rules-users] WorkingMemoryEntryPoint NullpointerException?

memoryEntryPoint is retrieved as null, what could be wrong here or do I need to do some special configuration in order to use working memory point streams? StatefulKnowledgeSession knowledgeSession = GivemeStatelessOrStateful .getStatefull("cashflow.drl"); WorkingMemoryEntryPoint memoryEntryPoint = knowledgeSession .getWorkingMemoryEntryPoint("TransactionStream");