JSF. Call backing bean method on every page load [duplicate] - jsf

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This question already has answers here:
Invoke JSF managed bean action on page load
(4 answers)
Closed 6 years ago.
here is my situation in short.
I have page with datatable and few buttons backed by bean. Bean should be initialized with some default properties. That properties can be changed depending on action.
I started with RequestScoped bean and #PostConstruct annotated method. but it seems that datatable works well only with View(Session)scoped. Now my setup look like this:
#ManagedBean
#ViewScoped
public class ProductsTableBean implements Serializable {
private LazyDataModel<Products> productsData;
#Inject
private ProductsFacade model;
public void onPageLoad() {
// here some defaults are set
// ...
System.err.println("onPageLoad called");
}
public void addRow() {
// andhere some defaults redefined
// ...
System.err.println("addRow called");
}
...
and snippet from jsf page:
<p:commandButton action="#{productsTableBean.addRow()}"
title="save"
update="#form" process="#form" >
</p:commandButton>
...
<f:metadata>
<f:event type="preRenderView" listener="#{productsTableBean.onPageLoad}"/>
</f:metadata>
And here is the main problem arise in calling order, i have following output:
onPageLoad called
addRow called
onPageLoad called <-- :(
But i want addRow to be the last action to be called, like this:
onPageLoad called
addRow called
Any simple solution here ?

Answer 1

Check this link :
http://www.mkyong.com/jsf2/jsf-2-prerenderviewevent-example/
You know that the event is call on every requests : ajax, validation fail .... You can check if it's new request like this:
public boolean isNewRequest() {
final FacesContext fc = FacesContext.getCurrentInstance();
final boolean getMethod = ((HttpServletRequest) fc.getExternalContext().getRequest()).getMethod().equals("GET");
final boolean ajaxRequest = fc.getPartialViewContext().isAjaxRequest();
final boolean validationFailed = fc.isValidationFailed();
return getMethod && !ajaxRequest && !validationFailed;
}
public void onPageLoad() {
// here some defaults are set
// ...
if (isNewRequest()) {...}
System.err.println("onPageLoad called");
}