现在又有了新的问题。我是用jbpm4.4建立会签任务，使用
taskService.completeTask(subtask.getId());无法结束子任务。
报错：
org.hibernate.ObjectNotFoundException:now rows given  
org.jbpm.pvm.internal.history.model.HistoryTaskInstanceImpl#11


请问如何修改

代码

package com.ht.util;

import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import org.jbpm.api.Configuration;
import org.jbpm.api.ProcessInstance;
import org.jbpm.api.TaskService;
import org.jbpm.api.activity.ActivityExecution;
import org.jbpm.api.activity.ExternalActivityBehaviour;
import org.jbpm.api.task.Task;
import org.jbpm.pvm.internal.env.EnvironmentImpl;
import org.jbpm.pvm.internal.history.HistoryEvent;
import org.jbpm.pvm.internal.history.events.TaskActivityStart;
import org.jbpm.pvm.internal.model.Activity;
import org.jbpm.pvm.internal.model.ExecutionImpl;
import org.jbpm.pvm.internal.model.Transition;
import org.jbpm.pvm.internal.session.DbSession;
import org.jbpm.pvm.internal.task.TaskImpl;


public class Huiqian implements ExternalActivityBehaviour {
private String form;

private static final long serialVersionUID = 1L;
private static int count = 0;// 同意人数

public void signal(ActivityExecution activityExecution, String signalName,
Map<String, ?> parms) throws Exception {
ExecutionImpl executionImpl = (ExecutionImpl) activityExecution;

// 获得流程实例
ProcessInstance pi = (ProcessInstance) executionImpl
.getProcessInstance();

// 获得任务服务
TaskService taskService = Configuration.getProcessEngine()
.getTaskService();
// 获得活动节点
Activity activity = executionImpl.getActivity();
List<Task> tasks = taskService.createTaskQuery().processInstanceId(
pi.getId()).list();
TaskImpl parentTask  =(TaskImpl)tasks.get(0);

// 获得子任务
List<Task> subTask_list = taskService.getSubTasks(tasks.get(0).getId());
Iterator<Task> iter = subTask_list.iterator();
// 循环所有子任务
while (iter.hasNext()) {

Task subtask = iter.next();
System.out.println(subtask.getId());
if (parms.get("name").equals(subtask.getAssignee())) {
if (parms.get("RESULT").equals("同意")) {
count++;
}
[b]taskService.completeTask(subtask.getId());[/b] // 完成当前会签人子任务
}
}

// 剩余子任务数量为1个时，则直接跳转下一个流程节点
if (subTask_list == null || subTask_list.size() == 1) {
Transition transition = null;
if ((signalName == null)
|| ((Task.STATE_COMPLETED.equals(signalName))
&& (activity.getOutgoingTransitions() != null) && (activity
.getOutgoingTransitions().size() == 1))) {
transition = activity.getOutgoingTransitions().get(0); // 获得将跳转到的transition
} else {
transition = activity.findOutgoingTransition(signalName);
}
Map<String, Object> map = new HashMap<String, Object>();
if (count == 2) {
count = 0;
map.put("RESULT", "PASS");

} else {
count = 0;
map.put("RESULT", "NOPASS");
// System.out.print("会签不通过");
}
taskService.completeTask(tasks.get(0).getId(), map); // 结束父任务
executionImpl.take(transition); // 流程继续

} else {
executionImpl.waitForSignal();
}

}

public void execute(ActivityExecution activityExecution) throws Exception {
ExecutionImpl executionimpl = (ExecutionImpl) activityExecution;
DbSession dbsession = EnvironmentImpl.getFromCurrent(DbSession.class);
TaskImpl taskimpl = dbsession.createTask();
taskimpl.setName("领导会签");
taskimpl.setExecution(executionimpl);
taskimpl.setProcessInstance(executionimpl.getProcessInstance());
taskimpl.setSignalling(false);
taskimpl.setExecutionDbid(executionimpl.getDbid());
dbsession.save(taskimpl);
HistoryEvent.fire(new TaskActivityStart(taskimpl), executionimpl);

// 从原任务中分出两个子任务
//子任务1分配给manager
TaskImpl subtask1 = taskimpl.createSubTask();
subtask1.setAssignee("manager");
subtask1.setFormResourceName(form);
subtask1.setName("领导会签,操作角色:" + "manager");
subtask1.setSignalling(false);
subtask1.setExecution(executionimpl);
subtask1.setExecutionDbid(executionimpl.getDbid());
dbsession.save(subtask1);
HistoryEvent.fire(new TaskActivityStart(subtask1), executionimpl);



//子任务2分配给boss
TaskImpl subtask2 = taskimpl.createSubTask();
subtask2.setAssignee("boss");
subtask2.setFormResourceName(form);
subtask2.setName("领导会签,操作角色:" + "boss");
subtask2.setSignalling(false);
subtask2.setExecution(executionimpl);
subtask2.setExecutionDbid(executionimpl.getDbid());
dbsession.save(subtask2);
HistoryEvent.fire(new TaskActivityStart(subtask2), executionimpl);


// 流程等待
executionimpl.waitForSignal();
}

public String getForm() {
return form;
}

public void setForm(String form) {
this.form = form;
}

}

工作流这么写，就没有通用性了。以上代码显然只是针对特定的流程定义