所有用到的service以及實現類都是工作流（Activiti）本身的。

public String taskRollback(String taskId){
    //根據要跳轉的任務ID獲取其任務
    HistoricTaskInstance hisTask = historyService
                .createHistoricTaskInstanceQuery().taskId(taskId)
                .singleResult();
    //進而獲取流程例項
    ProcessInstance instance = runtimeService
                .createProcessInstanceQuery()
                .processInstanceId(hisTask.getProcessInstanceId())
                .singleResult();
    //取得流程定義
 

    ProcessDefinitionEntity definition = (ProcessDefinitionEntity) repositoryService.getProcessDefinition(hisTask.getProcessDefinitionId());
    //獲取歷史任務的Activity
    ActivityImpl hisActivity = definition.findActivity(hisTask.getTaskDefinitionKey());
    //實現跳轉
    managementService.executeCommand(new JumpCmd(instance.getId(), hisActivity.getId()));
}

public
 
 class JumpCmd implements Command<ExecutionEntity>{

    private String processInstanceId;
    private String activityId;
    public static final String REASION_DELETE = "deleted";

    public JumpCmd(String processInstanceId, String activityId) {
        this.processInstanceId = processInstanceId;
        this
 
.activityId = activityId;
    }

    @Override
    public ExecutionEntity execute(CommandContext commandContext) {
        ExecutionEntity executionEntity = commandContext.getExecutionEntityManager().findExecutionById(processInstanceId);

        executionEntity.destroyScope(REASION_DELETE);
        ProcessDefinitionImpl processDefinition = executionEntity.getProcessDefinition();
        ActivityImpl activity = processDefinition.findActivity(activityId);
        executionEntity.executeActivity(activity);

        return executionEntity;
    }

}

用這個JumpCmd方法就可以實現所有流程節點的跳轉。