javax.el.Methodnotfoundexception

Question

Good afternoon guys, I’d like your help for a mistake that I still don’t understand why it happens.

The situation is: I have a method in my managedBean listTurmas that loads a list so that later I can use, already tested this method in a test on the console and worked perfectly, but when calling this method via JSF is returned the following error:

javax.el.MethodNotFoundException: /paginaListagem.xhtml @13,90 action="#{controllerTurma.listarTurmas}": Method not found: [email protected]()

call JSF:

<h:form><h:commandButton value="Consultar" action="#{controllerTurma.listarTurmas}" /></h:form>

Method List DAO:

    @SuppressWarnings("unchecked")
public List<T> consultarTodos(Class<T> classe){
    EntityManager em = getEM();
    List<T> objetosBuscados = null;             
    try {           
        objetosBuscados = em.createQuery("FROM "+classe.getName()).getResultList();         
    } catch (Exception e) {
        e.printStackTrace();
    }finally {
        em.close();
    }
    return objetosBuscados;
}

Method call in Controller:

public void listarTurmas(){
TurmaNegocio tn = new TurmaNegocio();
this.turmas = tn.consultarTodos();  

for (Turma turma : turmas) {
    System.out.println(turma.getDescricao());
}}