How to prevent PrimeFaces poll from clearing FacesMessages?

Question

I'm using PrimeFaces poll component to refresh some content.

<h:form id="formBsvtt">
  <p:messages autoUpdate="true" showDetail="false" />
  <p:outputPanel id="panelOut" layout="block">
    ...
    ... content to refresh
    ...
  </p:outputPanel>
  <p:panelGrid id="panelIn" layout="block">
    ...
    ... various input components with validation
    ...
  </p:panelGrid>
  <p:poll widgetVar="poll1" autoStart="true" global="false" interval="15" 
    partialSubmit="true" process="@this" update="panelOut"
    listener="#{myBean.myListener}">
  </p:poll>
</h:form>

As you can see I'm using messages with autoUpdate=true. My Problem is: In case of validation errors FacesMessages will be shown, but disappear not later than 15 seconds.

Is it possible to prevent poll from clearing FacesMessages without setting messages autoUpdate=false?

My web application is much bigger as code snippet specified above and my intention is not updating messages manually in each possible case!

Answer 1

PrimeFaces 2.x/3.x

This is not natively possible, so a trick is needed. In the rendered attribute of <p:messages>, check if <p:poll> was been triggered and if so, then return false. This way JSF thinks there's no auto-updatable messages component in the component tree during rendering and will therefore ignore it.

If the <p:poll> is triggered, then its client ID appears as javax.faces.source request parameter. So, this should do:

<p:messages ... rendered="#{param['javax.faces.source'] ne poll.clientId}" />
...
<p:poll binding="#{poll}" ... />

(note: no additional bean properties needed)

PrimeFaces 4.x+

All PrimeFaces command components got a new ignoreAutoUpdate attribute which you could set to false to ignore all autoUpdate="true" components in the ajax update.

<p:poll ... ignoreAutoUpdate="true" />