CODEWITHSUNDEEP
javaandroidretrofit2
Kristin Vernon
Kristin Vernon

Reputation: 155

How to fix "No Retrofit annotation found." in simple GET callback?

I'm following a tutorial online to get information from a local API using retrofit2, but when I run my code I get:

java.lang.IllegalArgumentException: No Retrofit annotation found. (parameter #1)

I notice most answers online have this problem when POSTing but all I'm trying to do is GET all the items in the database. The API part o this works and when I go to the local IP (10.0.2.2) on the emulator it gives me what I want. I don't understand why I'm getting this problem, actually still trying to fully understand the base code. I also saw some solutions using .enqueue but I guess i don't fully understand how to use it.

@GET("/institute/Students")
    void getStudent(Callback<List<Student>> callback);

 InstituteService serv = restService.getService();
 serv.getStudent(new Callback<List<Student>>() {...}

I'm trying to get a list of students from my database but I'm stuck right here. After initiating the Callback it goes straight to the onFailure activity. Any point in the right direction appreciated.

Upvotes: 2

Views: 382

Answers (2)

akshay bhange
akshay bhange

Reputation: 2504

Noticed that you are using callback not call and that too I guess goes as return type not as a parameter. This interface will return list of students, you can pass query parameters to function if required (eg. StudentId)

@GET("institutes/students/") 
Call<List<Student>> getStudentsData();

Please see this article for more information

Upvotes: 1

Martin Zeitler
Martin Zeitler

Reputation: 76859

These interface descriptions should return Call instead of void:

import retrofit2.Call;
import retrofit2.http.GET;
...

@GET("institute/students")
Call<ArrayList<Student>> getStudents();

Upvotes: 2

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