这是很早写工作流时写的一个方法，今天正好整理下资料，顺便共享下吧。

/**  * get all the task instances for a given actor. type 1：未接收；2：办理中；3：已办结；4：全部工作  */ public List
    
      findTaskInstances(String[] actorIds, String type) {  //结果1  List result1 = null;  try {   String hql = "";   if ("1".equals(type)) {// 1：未接收    hql = "select distinct ti "     + "from org.jbpm.taskmgmt.exe.TaskInstance as ti "     + "where ti.actorId in (:actorIds)"     + " and ti.isSuspended <> 1" + " and ti.isOpen = 1"     + " and ti.start is null" + " and ti.end is null"     + " order by ti.id desc";   } else if ("2".equals(type)) {// 2：办理中    hql = "select distinct ti "     + "from org.jbpm.taskmgmt.exe.TaskInstance as ti "     + "where ti.actorId in (:actorIds)"     + " and ti.isSuspended <> 1" + " and ti.isOpen = 1"     + " and ti.start is not null" + " and ti.end is null"     + " order by ti.id desc";   } else if ("3".equals(type)) {// 3：已办结    hql = "select distinct ti "     + "from org.jbpm.taskmgmt.exe.TaskInstance as ti "     + "where ti.id in ("     + " select max(t.id) from org.jbpm.taskmgmt.exe.TaskInstance as t"     + " where t.actorId in (:actorIds) and t.isOpen <> 1"     + "  and t.start is not null and t.end is not null group by t.processInstance.id)"     + " order by ti.id desc";   } else {// 4：全部工作    hql = "select distinct ti "     + "from org.jbpm.taskmgmt.exe.TaskInstance as ti "     + "where ti.id in ("     + " select max(t.id) from org.jbpm.taskmgmt.exe.TaskInstance as t"     + " where t.actorId in (:actorIds) group by t.processInstance.id)"     + " order by ti.id desc";   }   Query query = session.createQuery(hql);   query.setParameterList("actorIds", actorIds);   result1 = query.list();  } catch (Exception e) {   log.error(e);   jbpmSession.handleException();   throw new JbpmException("couldn't get task instances list for actor '" + actorIds + "'", e);  }  //结果2  List result2 = null;  try {   String hql = "";   if ("1".equals(type)) {// 1：未接收    hql = "select distinct ti "     + "from org.jbpm.taskmgmt.exe.PooledActor pa join pa.taskInstances ti "     + "where pa.actorId in (:actorIds)"     + " and ti.actorId is null"     + " and ti.isSuspended <> 1" + " and ti.isOpen = 1"     + " and ti.start is null" + " and ti.end is null"     + " order by ti.id desc";   } else if ("2".equals(type)) {// 2：办理中    hql = "select distinct ti "     + "from org.jbpm.taskmgmt.exe.PooledActor pa join pa.taskInstances ti "     + "where pa.actorId in (:actorIds)"     + " and ti.actorId is null"     + " and ti.isSuspended <> 1" + " and ti.isOpen = 1"     + " and ti.start is not null" + " and ti.end is null"     + " order by ti.id desc";   } else if ("3".equals(type)) {// 3：已办结    hql = "select distinct ti "     + "from org.jbpm.taskmgmt.exe.TaskInstance as ti "     + "where ti.id in ( select max(t.id)"     + " from org.jbpm.taskmgmt.exe.PooledActor pa join pa.taskInstances t"     + " where pa.actorId in (:actorIds) and t.actorId is null and t.isOpen <> 1"     + "  and t.start is not null and t.end is not null group by t.processInstance.id"     + " )order by ti.id desc";   } else {// 4：全部工作    hql = "select distinct ti "     + "from org.jbpm.taskmgmt.exe.TaskInstance as ti "     + "where ti.id in ( select max(t.id)"     + " from org.jbpm.taskmgmt.exe.PooledActor pa join pa.taskInstances t"     + " where pa.actorId in (:actorIds) and t.actorId is null group by t.processInstance.id"     + " )order by ti.id desc";   }   Query query = session.createQuery(hql);   query.setParameterList("actorIds", actorIds);   result2 = query.list();  } catch (Exception e) {   log.error(e);   jbpmSession.handleException();   throw new JbpmException("couldn't get pooled task instances list for actor '" + actorIds + "'", e);  }  //合并结果  Set set = new HashSet();  set.addAll(result1);  set.addAll(result2);  return new ArrayList(set); }