Primefaces DataTable sortBy EL无法解析表达式

Question

在我的facelet中，当我点击标题进行排序时，我有一个PF数据表，我明白了 javax.el.ELException: Failed to parse the expression [#{item.null}]

ShippingRoom.xhtml

<f:metadata>
   <o:viewParam name="id" 
     value="#{shippingRoomBean.room}"
     converter="#{shippingRoomConverter}"
     converterMessage="Unknown Shipping Room."
     required="true"
     requiredMessage="Bad request, please use a link from within the system." />
    <f:event type="preRenderView" listener="#{shippingRoomBean.init}" />
 </f:metadata>

Shipping Room Name: #{shippingRoomBean.name}<br/>
Shipping Room Location: #{shippingRoomBean.location}<br/>

 <p:dataTable id="itemDataTable" var="item" value="#{shippingRoomBean.items}" emptyMessage="No Items Found In This Shipping Room">

<p:column sortBy="item.name" headerText="Item Name"> //attempt1
    #{item.name}
</p:column>
<p:column sortBy="name" headerText="Item Name"> //attempt2 
    #{item.name}
</p:column>

ShippingRoomBean

@ManagedBean
@ViewScoped
public class ShippingRoomBean {

public void init() {
    System.out.println("Initializing ==");
    items = itemRepository.findItemsByShippingRoom(room.getId());
}

Answer 1

数据表周围需要<h:form>标记才能使sortBy正常工作。没有它，我得到javax.el.ELException: Failed to parse the expression [#{item.null}]

<h:form>
   <p:dataTable id="itemDataTable" var="item" value="#{shippingRoomBean.items}" emptyMessage="No Items Found In This Shipping Room">
     <p:column sortBy="name" headerText="Item Name">
         #{item.name}
     </p:column>

   </p:dataTable>
</h:form>

Answer 2

删除attempt1部分，即可完成。

从PF 4开始，您不能在sortBy属性中拥有当前对象，只能包含相关字段

sortBy="name"

而不是

sortBy="item.name"