How to implement a PhaseListener which runs at end of lifecycle?

Question

How can I implement a PhaseListener which runs at end of the JSF lifecycle?

Answer 1

You need to implement the PhaseListener interface and hook on beforePhase() of the PhaseId_RENDER_RESPONSE. The render response is the last phase of the JSF lifecycle.

public class MyPhaseListener implements PhaseListener {      @Override     public PhaseId getPhaseId() {         return PhaseId.RENDER_RESPONSE;     }      @Override     public void beforePhase(PhaseEvent event) {         // Do your job here which should run right before the RENDER_RESPONSE.     }      @Override     public void afterPhase(PhaseEvent event) {         // Do your job here which should run right after the RENDER_RESPONSE.     }  } 

To get it to run, register it as follows in faces-config.xml:

<lifecycle>     <phase-listener>com.example.MyPhaseListener</phase-listener> </lifecycle> 

---

Update the above phase listener is indeed applicaiton-wide. To have a phase listener for a specific view, use the beforePhase and/or afterPhase attributes of the <f:view>.

E.g.

<f:view beforePhase="#{bean.beforePhase}">     ... </f:view> 

with

public void beforePhase(PhaseEvent event) {     if (event.getPhaseId() == PhaseId.RENDER_RESPONSE) {         // Do here your job which should run right before the RENDER_RESPONSE.     } } 

A more JSF 2.0 way is by the way using the <f:event type="preRenderView">:

<f:event type="preRenderView" listener="#{bean.preRenderView}" /> 

with

public void preRenderView() {     // Do here your job which should run right before the RENDER_RESPONSE. } 

Answer 2

In jsf 2 you can use <f:phaseListener type="my.MyPhaseListener"> to hook MyPhaseListener for some facelet. MyPhaseListener should implement PhaseListener and override

• afterPhase - with code to be run after end of phase
• beforePhase - with code to be run before phase started
• getPhaseId - PhaseId enum specifying name of phase for which the listener to be invoked (PhaseId.RENDER_RESPONSE as last phase of lifecycle)