异常：

严重: Error while closing command context

org.activiti.engine.ActivitiException: Exception while invoking TaskListener: Exception while invoking TaskListener: null

at org.activiti.engine.impl.persistence.entity.TaskEntity.fireEvent(TaskEntity.java:742)

at org.activiti.engine.impl.bpmn.behavior.UserTaskActivityBehavior.execute(UserTaskActivityBehavior.java:212)

at org.activiti.engine.impl.pvm.runtime.AtomicOperationActivityExecute.execute(AtomicOperationActivityExecute.java:60)

代码：

public class ManagerTaskHandler extends Controller  implements TaskListener {   //不能extends session  controller这种东西。  

private static final long serialVersionUID = 1L;

@Override

public void notify(DelegateTask delegateTask) {

    Record adminUser = CNSessionManage.getAdminSessionAttr(this);

System.out.println("userName   "+ adminUser.get("userName"));

delegateTask.setAssignee(adminUser.get("userName"));

}

}

请问：jfinal不通过Controller，怎么获取session