jbpm4.4的历史流程实例查询的bug

List<HistoryProcessInstance> hpiList = historyService.createHistoryProcessInstanceQuery()
.processDefinitionId(processDefinitionId).ended().orderAsc(HistoryProcessInstanceQuery.PROPERTY_STARTTIME).list();

以上这句代码在查询时会报如下的错：

unexpected token: by near line 1, column 178 [select hpi from org.jbpm.pvm.internal.history.model.HistoryProcessInstanceImpl as hpi where  hpi.processDefinitionId = 'alertline_outline-1'   and  hpi.endTime is not nullorder by hpi.startTime asc]

看，后台代码在拼接hql的时候，没有分开nullorder

所以如果想查出已结束的流程可以这样写：

List<HistoryProcessInstance> hpiList = historyService.createHistoryProcessInstanceQuery()
.processDefinitionId(processDefinitionId).state(HistoryProcessInstance.STATE_ENDED)
.orderAsc(HistoryProcessInstanceQuery.PROPERTY_STARTTIME).list();

或者修改源代码，为其添加一个空格。