# How to reject a task like used pvm？
**URL:** https://forum.flowable.org/t/how-to-reject-a-task-like-used-pvm/588
**Category:** Uncategorized
**Created:** [May 23, 2017, 10:03am UTC](https://forum.flowable.org/t/how-to-reject-a-task-like-used-pvm/588 "2017-05-23T10:03:24Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@lanlan](https://forum.flowable.org/u/lanlan)
#### Post date: [May 23, 2017, 10:03am UTC](https://forum.flowable.org/t/how-to-reject-a-task-like-used-pvm/588/1 "2017-05-23T10:03:24Z")
I was reading a blog of edorasware.
Flowable 6 introduces a clean and predictable execution model. There’s a one-to-one relationship between BPMN and the execution operations, so all the odd bits of code scattered around the PVM operations are no longer needed.
so,how to reject a task like used pvm？plz answer me ,im a newer for flowable.
我在edorasware 的博客上看到，flowable6.0 取消了pvm。那么我现在想要自由的控制流程状态，应该怎么去做呢？
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### Author:  [@yvo](https://forum.flowable.org/u/yvo)
#### Post date: [May 23, 2017, 11:43am UTC](https://forum.flowable.org/t/how-to-reject-a-task-like-used-pvm/588/2 "2017-05-23T11:43:43Z")
Hi.
I’m not sure if I understand your question correctly.
What do you mean with ‘reject a task’.
Perhaps ‘unclaim a task’ (that was claimed)?
If so; that can be done with the Java API;
`TaskService.unclaim(String taskId);`
which is a shortcut for;
`TaskService.claim(String taskId, String userId);`
(Where userId is null for unclaim)
Regards,
Yvo
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### Author:  [@lanlan](https://forum.flowable.org/u/lanlan)
#### Post date: [May 24, 2017, 2:27am UTC](https://forum.flowable.org/t/how-to-reject-a-task-like-used-pvm/588/3 "2017-05-24T02:27:31Z")
Hi .
i want to perform a specified task whick is different from the next task in sequence flow;In flowable 5,i can do this by using PVM to set next task dynamically;
As shown in the process,the normal execution steps are as follows:start-\>task1-\>task2-\>task3-\>end.But in the implementation of the task 3 ,user found some problems during the process that only resolved by re-execute task1.How can i do it to achieve my purpose? there none branch.
in flowable5 or activty ,i can use Pvm to reset process runing to task1. like this:
ActivityImpl currActivity = ((ProcessDefinitionImpl) definition)
.findActivity(currTask.getTaskDefinitionKey());
List nextTransitionList = currActivity
.getIncomingTransitions();
// 清除当前活动的出口
List oriPvmTransitionList = new ArrayList();
List pvmTransitionList = currActivity
.getOutgoingTransitions();
for (PvmTransition pvmTransition : pvmTransitionList) {
oriPvmTransitionList.add(pvmTransition);
}
pvmTransitionList.clear();
```
// 建立新出口
List newTransitions = new ArrayList();
for (PvmTransition nextTransition : nextTransitionList) {
PvmActivity nextActivity = nextTransition.getSource();
ActivityImpl nextActivityImpl = ((ProcessDefinitionImpl) definition)
.findActivity(nextActivity.getId());
TransitionImpl newTransition = currActivity
.createOutgoingTransition();
newTransition.setDestination(nextActivityImpl);
newTransitions.add(newTransition);
}
// 完成任务
List tasks = taskService.createTaskQuery()
.processInstanceId(instance.getId())
.taskDefinitionKey(currTask.getTaskDefinitionKey()).list();
for (Task task : tasks) {
taskService.complete(task.getId(), variables);
historyService.deleteHistoricTaskInstance(task.getId());
}
// 恢复方向
for (TransitionImpl transitionImpl : newTransitions) {
currActivity.getOutgoingTransitions().remove(transitionImpl);
}
for (PvmTransition pvmTransition : oriPvmTransitionList) {
pvmTransitionList.add(pvmTransition);
}
```
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### Author:  [@lanlan](https://forum.flowable.org/u/lanlan)
#### Post date: [May 25, 2017, 6:05am UTC](https://forum.flowable.org/t/how-to-reject-a-task-like-used-pvm/588/4 "2017-05-25T06:05:48Z")
Hi .
i want to perform a specified task whick is different from the next task in sequence flow;In flowable 5,i can do this by using PVM to set next task dynamically;
As shown in the process,the normal execution steps are as follows:start-\>task1-\>task2-\>task3-\>end.But in the implementation of the task 3 ,user found some problems during the process that only resolved by re-execute task1.How can i do it to achieve my purpose? there none branch.
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### Author:  [@joram](https://forum.flowable.org/u/joram)
#### Post date: [May 25, 2017, 4:03pm UTC](https://forum.flowable.org/t/how-to-reject-a-task-like-used-pvm/588/5 "2017-05-25T16:03:04Z")
Why not use an exclusive gateway and have a sequence flow back to task 1 when the user finds a problem in task 3 (ie. set a variable when completing task 3 that is used for the expression on the sequence flow)?