How to display contents in reverse order in <h:dataTable> - jsf-2

Question

I am accepting data in Array and displaying it in the same screen using <h:dataTable>.
How can display contents in reverse order, i.e. show the latest entry in the first row?
Below is code can i display nonDox.non_List in reverse order
<h:body>
<h:panelGroup rendered="#{not empty dataBase}">
<h:form id="nonDoxScanForm">
<f:event listener="#{nonDox.validate_AccNo}" type="postValidate" />
<table border="0" class="InnerBox" width="55%">
<tr><th colspan="7" align="Center" class="clsTitle">Non Dox Add</th></tr>
<tr>
<td>Delivery Date</td>
<td >Consginee (F2) </td>
<td>Weight (F3)</td>
<td>SubBranch Code(F4)</td>
<td >Consignment No (F10)</td>
<td align="Center">(F12)</td>
</tr>
<tr>
<td> <p:calendar value="#{nonDox.delDate}" id="fDat" /> </td>
<td><h:inputText size="20" id="fcon" value="#{nonDox.consignee}" /> </td>
<td><h:inputText size="20" id="fweig" value="#{nonDox.weight}" >
</h:inputText> </td>
<td><h:inputText size="20" id="fsub" value="#{nonDox.subBranchCode}" >
<f:validateLength maximum="3"></f:validateLength>
</h:inputText> </td>`enter code here`
<td><h:inputText size="10" id="acno" value="#{nonDox.accNo}" onfocus="this.select()" >
</h:inputText>
</td>
<td> <h:commandButton value="Add" id="fAdd" action="#{nonDox.addAction}" onclick="return validate();" />
</td>
<td> <h:commandButton value="Save" action="#{nonDox.saveAction}" >
</h:commandButton>
</td>
</tr>
<tr>
<td colspan="7">
<h:message for="acno"/>
</td>
</tr>
</table>
<h:dataTable value="#{ nonDox.non_List}" var="o"
styleClass="order-table"
headerClass="order-table-header"
rowClasses="order-table-odd-row,order-table-even-row" width="55%"
>
<h:column>
<f:facet name="header">Del Date</f:facet>
#{o.cor_Date.substring(0, 10)}
</h:column>
<h:column>
<f:facet name="header">consignee</f:facet>
#{o.consignee}
</h:column>
<h:column>
<f:facet name="header">Weight</f:facet>
#{o.weight}
</h:column>
<h:column>
<f:facet name="header">Rate</f:facet>
#{o.rate}
</h:column>
<h:column>
<f:facet name="header">subBranchCode</f:facet>
#{o.subBranchCode}
</h:column>
<h:column>
<f:facet name="header" >POD No</f:facet>
#{o.accNo}
</h:column>
<h:column>
<f:facet name="header">Action</f:facet>
<h:commandLink value="Delete" action="#{nonDox.deleteAction(o)}" />
</h:column>
</h:dataTable>
</h:form>
<h:panelGroup >
<h:panelGroup rendered="#{empty dataBase}">
<h1>Session Expired</h1>
<h:link outcome="Login" target="CommonContent" >Login</h:link>
</h:panelGroup>
</h:body>

Answer 1

If you're using an List as in new ArrayList<Item>(), it's easy: use Collections#reverse():
private List<Item> data;
#PostConstruct
public void init() {
data = service.list();
Collections.reverse(data);
}
// ...
Just reference it in <h:dataTable value="#{bean.data}"> the usual way.
If you're using an array as in Item[], then you'd need to convert it to List first with help of Arrays#asList(), so that you can feed it to Collections#reverse():
private List<Item> data;
#PostConstruct
public void init() {
Item[] items = service.array();
data = Arrays.asList(items);
Collections.reverse(data);
}
// ...
Or just rewrite the service method in such way that you don't need to perform this conversion step in the backing bean.
Key is, you shouldn't expect to perform this job in the view. You should just prepare the model in such way that it's exactly as what the view expects. The <h:dataTable> itself doesn't provide any facilities like that.