MioBean.getAltrobean() {
  if (altrobean == null) {
    FacesContext ctx = FacesContext.getCurrentInstance();
    VariableResolver resolver = ctx.getApplication.getVariableResolver();
    Object tempBean = resolver.resolveVariable(ctx, "altrobean");
    if (.... alcuni controlli su tempBean....
     -.... se va bene
    altrobean = (AltroBean)tempBean;
  }
  return altrobean;
}