Error in parison of a json with gson in android

The problem I have is that basically, when I'm going to print the data, I already have toast, or with anything it brings me null data, the particular thing is that I print the toast for the times of data that are in the json, but all the data it brings are null. Here is the fragment of the method in which I am doing the operation

    RequestQueve rq;
    public List<Peliculas> peliculas

    public void webService(View vista){
    String url = "mi url";
    AlertDialog.Builder alert = new AlertDialog.Builder(this);
    rq = Volley.newRequestQueue(this);
    JsonArrayRequest jar = new JsonArrayRequest(Request.Method.POST, url, null, new Response.Listener<JSONArray>() {
        @Override
        public void onResponse(JSONArray response) {
            Type TypeList = new TypeToken<List<Peliculas>>(){
            }.getType();
            peliculas = new Gson().fromJson(response.toString(), TypeList);
            Toast.makeText(getApplicationContext(),"Respuesta completada con exito",Toast.LENGTH_LONG).show();
            for (Peliculas pelis : peliculas){
                Toast.makeText(getApplicationContext(),"ID pelicula"+pelis.getId_pelicula(), Toast.LENGTH_SHORT).show();
                Toast.makeText(getApplicationContext(),"nombre pelicula"+pelis.getNombre(), Toast.LENGTH_SHORT).show();
            }

        }
    }, new Response.ErrorListener() {
        @Override
        public void onErrorResponse(VolleyError error) {
            Toast.makeText(getApplicationContext(),"Hubo un error",Toast.LENGTH_LONG).show();
        }
    }){
        @Override
        public Map<String, String> getHeaders() throws AuthFailureError {
            Map<String,String>params = new HashMap<>();
            params.put("Accept","Application/json");
            return params;
        }
    };
    rq.add(jar);

}

And the movie class

public class Peliculas  {

public int getId_pelicula() {
    return id_pelicula;
}

public void setId_pelicula(int id_pelicula) {
    this.id_pelicula = id_pelicula;
}

public String getNombre() {
    return nombre;
}

public void setNombre(String nombre) {
    this.nombre = nombre;
}

public String getSipnosis() {
    return sipnosis;
}

public void setSipnosis(String sipnosis) {
    this.sipnosis = sipnosis;
}

public int getCalificacion() {
    return calificacion;
}

public void setCalificacion(int calificacion) {
    this.calificacion = calificacion;
}

public String getDuracion() {
    return duracion;
}

public void setDuracion(String duracion) {
    this.duracion = duracion;
}

public Peliculas(int id_pelicula, String nombre, String sipnosis, int calificacion, String duracion) {
    this.id_pelicula = id_pelicula;
    this.nombre = nombre;
    this.sipnosis = sipnosis;
    this.calificacion = calificacion;
    this.duracion = duracion;
}

private int id_pelicula;
private String nombre;
private String sipnosis;
private int calificacion;
private String duracion;

}