Another option could be to remember the work_item / work_item_id that you stopped at without completing it. Than you can continue that process by completing that workitem:
int workitemId = ... //From the work item that you remembered.
StatefulKnowledgeSession ksession = JPAKnowledgeService.loadStatefulKnowledgeSession(sessionId, kbase, config, env );
WorkItemManager wManager = ksession.getWorkItemManager();
wManager.completeWorkItem(workitemId,null);