@RequestMapping(path = "/api/listaEstu", method = RequestMethod.POST)
 @ResponseBody
 public void guardar(
     @ModelAttribute ListaEstu alumno, @ModelAttribute("alumno_id") Long alumnoId) {
   Alumno alum = alumnoDao.obtener(alumnoId);
   alumno.setAlumno(alum);
   listaestuDao.agregar(alumno);
 }
 @RequestMapping(path = "/api/listaEstu/{id}", method = RequestMethod.PUT)
 @ResponseBody
 public void editar(
     @PathVariable Long id,
     @ModelAttribute ListaEstu alumno,
     @ModelAttribute("alumno_id") Long profesorId) {
   Alumno alum = alumnoDao.obtener(profesorId);
   alumno.setAlumno(alum);
   alumno.setId(id);
   listaestuDao.editar(alumno);
 }