Cell edit in primefaces is not updating the value - jsf

Question

I have a datatable in my primefaces application . The code for the frontend has
<!-- Start of customer datatable -->
<p:dataTable var="customer" value="#{customerBean.customers}" paginator="true" selection="#{customerBean.selectedCustomer}"
selectionMode="single" onRowSelectUpdate=":custList" onRowSelectComplete="custTab.show()" id="custList" widgetVar="custList" update=":custList">
<f:facet name="header">
List of Customers
<p:outputPanel>
<p:commandButton value="+" type="button" onclick="addCustDlg.show()"/>
</p:outputPanel>
</f:facet>
<p:column sortBy="#{customer.id}" filterBy="#{customer.id}" update=":custList">
<f:facet name="header">
<h:outputText value="ID"/>
</f:facet>
<h:outputText value="#{customer.id}"/>
</p:column>
<p:column sortBy="#{customer.name}" filterBy="#{customer.name}" headerText="NAME" filterMatchMode="contains" update=":custList">
<p:cellEditor>
<f:facet name="output">
<h:outputText value="#{customer.name}"/>
</f:facet>
<f:facet name="input">
<p:inputText value="#{customer.name}"/>
</f:facet>
</p:cellEditor>
</p:column>
<p:column sortBy="#{customer.description}" filterBy="#{customer.description}" headerText="DESCRIPTION">
<p:cellEditor>
<f:facet name="output">
<h:outputText value="#{customer.description}"/>
</f:facet>
<f:facet name="input">
<p:inputText value="#{customer.description}"/>
</f:facet>
</p:cellEditor>
</p:column>
<p:column sortBy="#{customer.signupDate}" filterBy="#{customer.signupDate}" headerText="SIGN UP DATE">
<f:facet name="output">
<h:outputText value="#{customer.signupDate}"/>
</f:facet>
</p:column>
<p:column sortBy="#{customer.validUntil}" filterBy="#{customer.validUntil}" headerText="EXPIRY DATE">
<p:cellEditor>
<f:facet name="output">
<h:outputText value="#{customer.validUntil}"/>
</f:facet>
<f:facet name="input">
<p:inputText value="#{customer.validUntil}"/>
</f:facet>
</p:cellEditor>
</p:column>
<p:column sortBy="#{customer.status}" filterBy="#{customer.status}" headerText="STATUS">
<p:cellEditor>
<f:facet name="output">
<h:outputText value="#{customer.status}"/>
</f:facet>
<f:facet name="input">
<p:inputText value="#{customer.status}"/>
</f:facet>
</p:cellEditor>
</p:column>
<p:column headerText="CREATION DATE" sortBy="#{customer.creationDate}" filterBy="#{customer.creationDate}">
<f:facet name="output">
<h:outputText value="#{customer.creationDate}"/>
</f:facet>
</p:column>
<p:column headerText="LAST UPDATE DATE" sortBy="#{customer.lastUpdateDate}" filterBy="#{customer.lastUpdateDate}">
<f:facet name="output">
<h:outputText value="#{customer.lastUpdateDate}"/>
</f:facet>
</p:column>
<p:column headerText="Options">
<p:rowEditor/>
</p:column>
</p:dataTable>
<!-- End of dataTable (customer datatable) -->
And the function for handling the rowEvent is specified in the bean as
public void custRowEdit(RowEditEvent event){
Customer cust = (Customer) event.getObject();
EntityManagerHelper.beginTransaction();
custDao.update(cust);
EntityManagerHelper.commit();
}
However , on an update event , when I am editing the cell in the table , I do not get the new updated value of the attribute .
Like in the image below , when I edit the status of the entry with ID 1 from 11 to 4 , in the function custRowEdit , when I try to get the customer object , I still get the status of the customer as 11 and not 4 .
Can anyone help me with understanding why the value of the cell is not being set ?

Answer 1

from Where You are invoking custRowEdit(RowEditEvent event) method. I have not any related thing in your code.
In order to make your listener invoke add below attribute in your datatable declaration.
rowEditListener="#{customerBean.listenerInBackingBean}"
<p:dataTable var="customer" value="#{customerBean.customers}" paginator="true" selection="#{customerBean.selectedCustomer}"
selectionMode="single" onRowSelectUpdate=":custList" onRowSelectComplete="custTab.show()" id="custList" widgetVar="custList" update=":custList">
<f:facet name="header"
rowEditListener="#{customerBean.cutRowEvent}"
>

Answer 2

Check the implementation of customerBean.customers. I reloaded the content from the database every time the method got called. Wrong. This should happen in the constructor instead. Now everything works fine. Thought it was a JavaScript error ...

Answer 3

Thanks this helped me.
May I add that instead of loading the list from a query in the constructor, if one has a #SessionScoped managed bean one can instead use a reset() method to reset lists to null and then lazily populate the lists from the query. The reset can then be called on page load using an f:event:
<f:view>
<f:metadata>
<f:event type="preRenderView" listener="#{sessionScopedBean.reset}"/>
</f:metadata>
</f:view>

Answer 4

I encountered a similar situation that was resolved by removing the update="" tag from the dataTable. The table's default behavior is to update the row, which evidently, in my case, was not occurring.

Answer 5

You are missin the p:ajax event to trigger the method, function or whatever you wanna do after the cell editing
it's something like
<p:ajax event="cellEdit" listener="#{mBean.onCellEdit}" update="elementX" />