Primefaces:向datatable添加一个新行给出错误:DataModel必须在启用选择时实现org.primefaces.model.SelectableDataModel

Question

我有一个数据表,我想添加一个新行.执行此操作时,我收到以下错误javax.servlet.ServletException:启用选择时,DataModel必须实现org.primefaces.model.SelectableDataModel.

我怎样才能解决我的问题？

这是我的xhtml

<h:commandLink  action="#{workOrderDetail.addOrderItem}" >
        <img src="${path.staticRootUrl}images/add.png" border="0" alt="${msg.workorderdetail_neworderitem}" title="${msg.workorderdetail_neworderitem}"/>
     </h:commandLink>
<p:dataTable styleClass="ptable100" id="orderItems" var="orderItem" value="#{workOrderDetail.orderItems}" width="100%" height="200" widgetVar="results"
     emptyMessage="#{msg.all_lists_no_records_found}" selection="#{workOrderDetail.selectedOrderItem}" selectionMode="single" onRowSelectUpdate=":detail:sub"
     rowKey="#{orderItem.id}"
<p:ajax event="rowSelect"  update=":detail:sub" />

这是我的bean代码

List<IMWSOrderItem> orderList = null;
public void addOrderItem() throws MWSException {
  IMWSOrderItem newOrderItem = getWorkOrder().getMWSOrder().getMWSOrderItem_Set().getNewMWSOrderItem();      
  getWorkOrder().getMWSOrder().getMWSOrderItem_Set().addMWSOrderItem(newOrderItem);
  orderList = null;   
}
public List<IMWSOrderItem> getOrderItems() throws MWSException {
  if (orderList == null) {
     orderList = new ArrayList(Arrays.asList(getWorkOrder().getMWSOrder().getMWSOrderItem_Set().getMWSOrderItems()));
  }
  return orderList;
}
public IMWSOrderItem getSelectedOrderItem() {
  return selectedOrderItem;
}
public void setSelectedOrderItem(IMWSOrderItem newSelectedOrderItem) {
  this.selectedOrderItem = newSelectedOrderItem;
}

Answer 1

好的,发现了问题.添加新项时,其ID默认为null,id用作rowkey.所以我在添加一个新的时候将id初始化为-1并且它有效.