Error while perfoming Row Edit in p:dataTable - jsf

Question

I am trying to perform a row edit in primefaces databable. My problem is when I key in new value in inputText in CellEditor
and click edit (primefaces icon) onCellEdit method is calledsuccessfully but does not pick the newly value in the inputText it pick value that was initially in the datatable. What Am I doing wrong? I am using primefaces 3.5
Here in jsf code
<h:form id="form1">
<p:growl id="messages" showDetail="true"/>
<p:panel header="Registered Devices" style="min-height: 400px;" id="paneldevices">
<p:dataTable emptyMessage="No Device Registered" editable="true" widgetVar="deviceTable" id="idGrid" value="#{deviceMgdBean.devices}" var="item" >
<p:ajax event="rowEdit" listener="#{deviceMgdBean.onCellEdit()}" update=":form1:messages"/>
<p:ajax event="rowEditCancel" listener="#{deviceMgdBean.onCancel}" update=":form1:messages" />
<p:column headerText="Options" style="width:50px">
<p:rowEditor />
</p:column>
<p:column>
<f:facet name="header">
<h:outputText value="Device_name"/>
</f:facet>
<p:cellEditor>
<f:facet name="output">
<h:outputText value="#{item.device_name}"/>
</f:facet>
<f:facet name="input">
<p:inputText value="#{item.device_name}" style="width:80%" />
</f:facet>
</p:cellEditor>
</p:column>
</h:form>
Here is my managed Bean
#ManagedBean
#ViewScoped
public class DeviceMgdBean implements Serializable {
public List<Devices> getDevices()
{
List<Devices> l=getDevdao().getDevices();//devices fetched from database
return l;
}
public void onCellEdit(RowEditEvent event)
{
Devices devo=(Devices) event.getObject();
FacesMessage msg = new FacesMessage("Device Edit","Test:"+devo.getDeviceName());
FacesContext.getCurrentInstance().addMessage(null, msg);
}
public void onCancel(RowEditEvent event)
{
FacesMessage msg = new FacesMessage("Item Cancelled");
FacesContext.getCurrentInstance().addMessage(null, msg);
Devices devo=(Devices) event.getObject();
}
}
class Devices {
private int device_id;
private String device_name;
//getter and setters
}

Answer 1

private List<Devices> l;
public List<Devices> getDevices() {
if(l==null) l=getDevdao().getDevices();//devices fetched from database
return l;
}