我是新来的 retrofit （我用的是 volley 在此之前，我在改装方面做得很好，直到出现以下错误：-
com.google.gson.jsonsyntaxexception:java.lang.illegalstateexception:应为int，但在第8行第37列路径$.response.data.book\服务\ id处为布尔值
我尝试了这个网站提供的每一个解决方案，但无法控制自己，因为我是新手 retrofit . 我想是因为 JSON parsing 错误。我不知道怎么处理。这可能是一个重复的问题，但请帮助。下面是我的代码：
请求和获取数据：

private void makeBookingRequest(String position) {
    final CustomProgressDialog dialog = new CustomProgressDialog();
    dialog.show(getSupportFragmentManager(),"tag");
    SharedPreferences preferences = getSharedPreferences("MYSharedPref",MODE_PRIVATE);
    String sessionkey = preferences.getString("sessionkey",null);
    System.out.println(sessionkey);
    String serviceId = position;
    System.out.println(position);
    APIEndPoints endPoints = Url.getInstance().create(APIEndPoints.class);
    Call<Book> call = endPoints.makeBookingRequest(serviceId,sessionkey);
    call.enqueue(new Callback<Book>() {
        @Override
        public void onResponse(Call<Book> call, retrofit2.Response<Book> response) {
            dialog.dismiss();
            if (!response.isSuccessful()) {
                Toast.makeText(HomeActivity.this, "server is not responding", Toast.LENGTH_SHORT).show();
            }
            else if(response.body() != null){
                Book bookData = response.body();
                String message = bookData.response.message;
                Toast.makeText(HomeActivity.this, message, Toast.LENGTH_SHORT).show();
            }
        }

        @Override
        public void onFailure(Call<Book> call, Throwable t) {
            dialog.dismiss();
            Toast.makeText(HomeActivity.this, "Error" + t.getLocalizedMessage(), 
Toast.LENGTH_SHORT).show();
            System.out.println(t);
        }
    });
}

型号等级：

package com.medpal.medpal_client.Models;
    import com.google.gson.annotations.SerializedName;

    public class Book {
    @SerializedName("response")
    public ResponseEntity response;

    public class ResponseEntity{
        @SerializedName("data")
        public DataEntity data;
        @SerializedName("secondary_message")
        public String secondary_message;
        @SerializedName("message")
        public String message;
        @SerializedName("code")
        public int code;
    }
    public class DataEntity {
        @SerializedName("book_service_id")
        public int book_service_id;
    }
}

API端点

@FormUrlEncoded
@Headers({"apikey: testapikey", "Content-Type:application/x-www-form-urlencoded" })
@POST("service/accept?")
Call<Book> makeBookingRequest(
  @Field("service_id") String ServiceId,
  @Field("session_key") String sessionKey);

url类

public class Url {
    public static final String base_url = "http://www.medpal.net/api/v1/";
    public static final String serviceUrl = "http://www.medpal.net/api/v1/services?";
        public static Retrofit retrofit;
        public static Retrofit getInstance() {
            if (retrofit == null) {
                retrofit = new Retrofit.Builder()
                        .baseUrl(base_url)
                        .addConverterFactory(GsonConverterFactory.create())
                        .build();
            }
            return retrofit;
        }

}

来自服务器的最终响应：

{
    "response": {
        "error": [],
        "code": 200,
        "message": "Service booked",
        "secondary_message": "Service booked successfully",
        "data": {
            "book_service_id": 35
        }
    }
}