commandbutton executes method, but being null values. Why are not the inputstexts values assigned to the class attributes?

In all the examples I saw in the code below, the normal occurrence was when the xhtml page was started creating a new client-type object. Through the values entered in the inputs, set the attributes of this object and the commandbutton could use this data in some way, invoking a method. This is not happening in the code below. Why?

JSF Code:

 <p:panel id="dados-cliente" header="Dados do Cliente">
      <h:form>
           <p:panelGrid id="dados-cliente-container" columns="2">
                <p:outputLabel value="CNPJ:"/>
                <p:inputMask mask="##.###.###/####-##" value="# {clienteMB.cliente.cnpj}"/>
                <p:outputLabel value="Razão Social:"/>
                <p:inputText value="#{clienteMB.cliente.razao_social}"/>
                <p:commandButton action="#{clienteMB.Salvar}" value="Salvar" process="@this"/>
           </p:panelGrid>
      </h:form>
  </p:panel>

Java code:

@ManagedBean
public class ClienteMB {
    Cliente cliente;

    public ClienteMB(){
        cliente = new Cliente();
    }

    public Cliente getCliente() {
        return cliente;
    }

    public void setCliente(Cliente cliente) {
        this.cliente = cliente;
    }

    public void Salvar(){
        System.out.println(cliente.getRazao_social());
        System.out.println(cliente.getCnpj());
    }

}