activiti设置驳回节点的问题

Question

最近项目里碰到用activiti工作流来做一个驳回功能，要求驳回到上一个指定的流程，比方说部门职员写申请给部门经理，部门经理审批完给总经理，然后总经理看完不行就驳回给部门经理，我现在写的代码会从总经理这里直接驳回给部门员工，各位看看该怎么写比较好，多谢了

Answer 1

``
public void backToActivity(String taskId, String activityId) {
    Task task = taskService.createTaskQuery().taskId(taskId).singleResult();
    if (task == null) {
        throw new RuntimeException("任务不存在");
    }

    List<HistoricTaskInstance> historicTaskInstances = historyService.createHistoricTaskInstanceQuery()
            .processInstanceId(task.getProcessInstanceId()).orderByHistoricTaskInstanceEndTime().desc().list();
    HistoricTaskInstance lastTask = null;
    for (HistoricTaskInstance historicTaskInstance : historicTaskInstances) {
        if (historicTaskInstance.getTaskDefinitionKey().equals(activityId)) {
            lastTask = historicTaskInstance;
            break;
        }
    }

    if (lastTask == null) {
        throw new RuntimeException("没有找到指定节点的任务");
    }
    String lastAssignee = lastTask.getAssignee();
    Map<String, Object> variables = new HashMap<>();
    variables.put("assigneeList", Arrays.asList(lastAssignee));
    runtimeService.createProcessInstanceModification(task.getProcessInstanceId())
            .startBeforeActivity(activityId).setVariables(variables).execute();
}

```