activiti6.0 提交流程至某节点 ，可用于实现驳回操作（未测试）

/**
 * @param task             任务Id
 * @param variables        ...
 * @param targetActivityId 节点ID
 * @throws Exception ...
 * @creator 毛志涛
 * @date 2018/2/25
 * @描述 提交流程至某节点
 */
private void commitProcess(Task task, Map<String, Object> variables, String targetActivityId) {
    // TODO: 2018/2/25 未测试
    //获取当前节点Id
    String currentActivityId = task.getTaskDefinitionKey();
    //获取模型实体
    String processDefinitionId = task.getProcessDefinitionId();
    BpmnModel bpmnModel = repositoryService.getBpmnModel(processDefinitionId);
    //获取当前节点
    FlowElement currentFlow = bpmnModel.getFlowElement(currentActivityId);
    //获取目标节点
    FlowElement targetFlow = bpmnModel.getFlowElement(targetActivityId);
    //创建连线
    String uuid = UUID.randomUUID().toString().replace("-", "");
    SequenceFlow newSequenceFlow = new SequenceFlow();
    newSequenceFlow.setId(uuid);
    newSequenceFlow.setSourceFlowElement(currentFlow);
    newSequenceFlow.setTargetFlowElement(targetFlow);
    //设置条件
    newSequenceFlow.setConditionExpression("${\"+uuid+\"==\"" + uuid + "\"}");
    //添加连线至bpmn
    bpmnModel.getMainProcess().addFlowElement(newSequenceFlow);
    //添加变量（保证这根线独一无二）
    variables.clear();//清空变量，防止干扰
    variables.put(uuid, uuid);
    //提交
    taskService.addComment(task.getId(), task.getProcessInstanceId(), "撤回");
    //完成任务
    taskService.complete(task.getId(), variables);
    //删除连线
    bpmnModel.getMainProcess().removeFlowElement(uuid);
}