jsf - PrimeFaces ajax don't work -

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why, when use ajax = true action button primefaces not work? whenever happens me, has same situation?

<p:commandbutton action="#{usuariobean.insert()}" value="gravar"      icon="/resources/img/accept.ico">     <p:confirm header="confirmação" message="tem certeza??" icon="ui-icon-alert"/>       </p:commandbutton> <p:confirmdialog global="true" showeffect="fade" hideeffect="fade">       <p:commandbutton value="sim" type="button" styleclass="ui-confirmdialog-yes"      icon="ui-icon-check"/>       <p:commandbutton value="não" type="button" styleclass="ui-confirmdialog-no"      icon="ui-icon-close"/>        </p:confirmdialog>

in case, need 2 things , none work.

you should review "action" attribute in commandbutton (action="#{usuariobean.insert}").

<p:commandbutton action="#{usuariobean.insert}" value="gravar"      icon="/resources/img/accept.ico">     <p:confirm header="confirmação" message="tem certeza??" icon="ui-icon-alert"/>   </p:commandbutton>

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