convertidor

public abstract class MiEntidadConverter implements Converter {

    @Override
    public Object getAsObject(FacesContext context, UIComponent component, String value) {
        try{
            Integer key = Integer.valueOf(value);
            MiManagedBean managedBean = (MiManagedBean) context.getApplication().getELResolver().getValue(
                    context.getELContext(), null, "named managed bean");
            return managedBean.getObjeto(key); // el metodo find() facade debe recibir el Integer "key"
        }catch(NumberFormatException e){
            context.addMessage(null, new FacesMessage("Error al implementar el managed bean" + e.getMessage()));
        }
        return null;
    }

    @Override
    public String getAsString(FacesContext context, UIComponent component, Object value) {
        try{
            if(value instanceof MiEntidad){
                MiEntidad iobjetoEntity = (MiEntidad) value;
                return objetoEntity.id.toString();
            }
        }catch(Exception e){
            context.addMessage(null, new FacesMessage("Error al convertir a String" + e.getMessage()));
        }
        return null;
    }

}