In Cell editing does not update value on focus change - primefaces

Question

Cell value is not captured when mouse focus changes
I have a simple datatable that shows the name and income. The cell values are editable. When I update the cell value with a different value and hit "Update" (basically change mouse focus) the new value is not captured. The update method
prints the old value. However, when I press the "tab" key I can see the updated values printed. I am not sure what I am missing
Here is my backing bean:
#PostConstruct
public void init() {
NVPair nvp = new NVPair("xx", 10000);
dataList.add(nvp);
nvp = new NVPair("yy", 20000);
dataList.add(nvp);
}
public void update() {
for (NVPair item : dataList) {
System.out.println("Name: " + item.getName() + " Value: " +
item.getValue());
}
}
Here is the view:
<h:form>
<p:dataTable id="testTable" value="#{testBean.dataList}" var="item"
editable="true" editMode="cell">
<p:ajax event="cellEdit" listener="#{testBean.onCellEdit}"
immediate="true" update="testTable" />
<p:column headerText="Name">
<p:cellEditor>
<f:facet name="output">
<h:outputText value="#{item.name}" />
</f:facet>
<f:facet name="input">
<h:outputText value="#{item.name}" />
</f:facet>
</p:cellEditor>
</p:column>
<p:column headerText="Income">
<p:cellEditor>
<f:facet name="output">
<h:outputText value="#{item.value}" />
</f:facet>
<f:facet name="input">
<p:inputText value="#{item.value}" />
</f:facet>
</p:cellEditor>
</p:column>
</p:dataTable>
<p:commandButton action="#{testBean.update}" value="Update" />
</h:form>
When the focus changes, I am expecting that the edited value is captured just like when the tab key is pressed.