Why is partial-rendering failing in this particular case? - ajax

Question

I am using Mojarra 2.2.
Here the snippet:
<h:head>
<title></title>
</h:head>
<h:body>
<h:form id="playersFormId">
<h:dataTable id="playersTableId"
value="#{ajaxBean.myMap.entrySet()}" var="t">
<h:column>
<f:facet name="header">
Delete
</f:facet>
<h:commandLink id="commandDeleteId"
immediate="true"
action="#{ajaxBean.deletePlayerAction(t.key)}">
<f:ajax render=":playersFormId:playersTableId"/>
<h:graphicImage value="/resources/default/imgs/delete.png"/>
</h:commandLink>
</h:column>
<h:column>
<f:facet name="header">
Nr
</f:facet>
#{t.key}
</h:column>
<h:column>
<f:facet name="header">
Name
</f:facet>
#{t.value}
</h:column>
</h:dataTable>
</h:form>
</h:body>
with
#Named
#ViewScoped
public class AjaxBean implements Serializable {
private Map<Integer, String> myMap = new HashMap<>();
#PostConstruct
public void init() {
myMap.put(1, "Nadal Rafael");
myMap.put(2, "Federer Roger");
myMap.put(3, "Ferer David");
myMap.put(4, "Murray Andy");
myMap.put(5, "Djokovic Novak");
myMap.put(6, "Berdych Tomas");
myMap.put(7, "Haas Tommy");
myMap.put(8, "Isner John");
myMap.put(9, "Fognini Fabio");
myMap.put(10, "Robredo Tommy");
}
public Map<Integer, String> getMyMap() {
return myMap;
}
public void setMyMap(Map<Integer, String> myMap) {
this.myMap = myMap;
}
public void deletePlayerAction(String nr) {
FacesContext facesContext = FacesContext.getCurrentInstance();
ExternalContext externalContext = facesContext.getExternalContext();
Map<String, String> headers = externalContext.getRequestHeaderMap();
//determination method 1
PartialViewContext partialViewContext =
facesContext.getPartialViewContext();
if (partialViewContext != null) {
if (partialViewContext.isAjaxRequest()) {
System.out.println("THIS IS AN AJAX REQUEST (DETERMINATION 1) ...");
} else {
System.out.println("THIS IS A NON-AJAX REQUEST(DETERMINATION 1)...");
}
}
System.out.println("nr: "+nr);
if(nr!=null){
myMap.remove(Integer.valueOf(nr));
}
}
}
I see that when i click on the image link, the server-side action method is getting c/d and the record is removed from the map.
I have specified that the datatable needs to be refreshed, but it doesn't get so.
Where am I getting it wrong?
When I click on the first record, under Network Tab, I see-
& under Console Tab-