algaworks JSF Primefaces does not have void methods

I'm studying PrimeFaces with CDI for some video lessons I've been watching but something strange is happening.

I have a bean gestaoEmpresas

There are two methods, a void consultar() and a List<Empresas> todasEmpresas()

But in my XHTML does not see my method void only the method with return of a List but if you change the tag and put in a <h:commandButtum for example it sees. For example:

// does not see query method

<f:metadata>
<f:viewAction action="#{gestaoEmpresasBean.}" />
</f:metadata>

// does not see query method

<p:commandButton action="#{gestaoEmpresasBean.}"/>

// see method check

<h:commandButton action="#{gestaoEmpresasBean.consultar}"/>

I do not understand why he can not see when I use Faces or PrimeFaces