I am new about jbpm. I want to retrieve all tasks of a particular actorId, but by using the following code, only those open tasks are retrieved.

JbpmContext jContext = JbpmConfiguration.getInstance().createJbpmContext();
List taskList = jContext.getTaskList(actorId);

I checked the hibernate query generated by this method, there is a condition:
taskinstan0_.ISOPEN_=1

If I want to retrieve all tasks including those closed tasks and review them, how should I do? Any help? Thanks in advance.