f:viewAction

Since JSF 2.2, you can invoke an action or actionListener, passing through the JSF phases using f:viewAction.

General Usage

It's possible to choose this method to be executed during non-JSF request (GET) or in a postBack, using postBack attribute. Another useful attribute could be phase, as there you can specify which JSF PhaseId you want that method to be invoked on.
View action was executed in phase UPDATE_MODEL_VALUES 4

Source Code

<ui:composition xmlns="http://www.w3.org/1999/xhtml" xmlns:f="http://xmlns.jcp.org/jsf/core"
	xmlns:h="http://xmlns.jcp.org/jsf/html"	xmlns:ui="http://xmlns.jcp.org/jsf/facelets">

	<f:metadata>
		<f:viewAction action="#{viewMetadataBackingBean.viewAction}" phase="UPDATE_MODEL_VALUES"/>
	</f:metadata>
	<h:outputText value="#{viewMetadataBackingBean.viewActionText}"/>

</ui:composition>
@ManagedBean
@RequestScoped
public class ViewMetadataBackingBean {

	private String viewActionText;
	private Country viewCountry;

	public String getViewActionText() {
		return viewActionText;
	}

	public Country getViewCountry() {
		return viewCountry;
	}

	public void setViewActionText(String viewActionText) {
		this.viewActionText = viewActionText;
	}

	public void setViewCountry(Country viewCountry) {
		this.viewCountry = viewCountry;
	}

	public String viewAction() {
		PhaseId phaseId = FacesContext.getCurrentInstance().getCurrentPhaseId();

		String phaseName = phaseId.toString();

		this.viewActionText = "View action was executed in phase " + phaseName;

		return null;
	}
}
Liferay Faces Bridge Implementation 5.0.0 + Showcase Common 3.1.1 + Liferay Faces Util 3.4.1 + Mojarra 2.2.20