flowable通过ChangeActivityStateBuilder 驳回到起点

在flowable中，可以通过ChangeActivityStateBuilder将一个任务驳回到其所在流程的起点。具体步骤如下：

获取当前任务的Execution对象：

Execution execution = runtimeService.createExecutionQuery().executionId(task.getExecutionId()).singleResult();

获取流程的起点Activity对象：

Activity startEvent = processDefinitionEntity.findActivity("startEventId");

构建ChangeActivityStateBuilder对象：

ChangeActivityStateBuilder builder = runtimeService.createChangeActivityStateBuilder()
        .processInstanceId(execution.getProcessInstanceId())
        .moveSingleActivityIdToActivityIds(task.getTaskDefinitionKey(), Collections.singletonList(startEvent.getId()));

执行驳回操作：

builder.changeState();

注意，驳回操作会将当前任务及其之后的所有任务都删除，流程会回到起点重新开始。因此，在执行驳回操作前，需要确保该任务之后的任务均已完成或被删除。

完整代码示例：

Task task = taskService.createTaskQuery().taskId(taskId).singleResult();
Execution execution = runtimeService.createExecutionQuery().executionId(task.getExecutionId()).singleResult();
ProcessDefinitionEntity processDefinitionEntity = (ProcessDefinitionEntity) repositoryService.getProcessDefinition(task.getProcessDefinitionId());
Activity startEvent = processDefinitionEntity.findActivity("startEventId");

ChangeActivityStateBuilder builder = runtimeService.createChangeActivityStateBuilder()
        .processInstanceId(execution.getProcessInstanceId())
        .moveSingleActivityIdToActivityIds(task.getTaskDefinitionKey(), Collections.singletonList(startEvent.getId()));
builder.changeState();
``

flowable通过ChangeActivityStateBuilder 驳回到起点