activiti删除重新建表

@Test
    public void clear() {
        List<Task> resultTask = taskService.createTaskQuery().list();
        for (Task task : resultTask) {
            runtimeService.deleteProcessInstance(task.getProcessInstanceId(), "删除表单");
        }
        List<HistoricTaskInstance> his = historyService.createHistoricTaskInstanceQuery().list();
        for (HistoricTaskInstance task : his) {
            historyService.deleteHistoricTaskInstance(task.getId());
        }
        List<HistoricProcessInstance> procHis = historyService.createHistoricProcessInstanceQuery().list();
        for (HistoricProcessInstance proc : procHis) {
            historyService.deleteHistoricProcessInstance(proc.getId());
        }
    }