拥有下一个代码，使用resteasy获取twilio呼叫信息：

import java.util.Base64;

import javax.ws.rs.core.HttpHeaders;
import javax.ws.rs.core.Response;

import org.jboss.resteasy.client.jaxrs.ResteasyClient;
import org.jboss.resteasy.client.jaxrs.ResteasyClientBuilder;
import org.jboss.resteasy.client.jaxrs.ResteasyWebTarget;

import com.twilio.rest.api.v2010.account.Call;

public class RestGetCallInfo1 {

    public static void main(String[] args) {
        try {                   

            ResteasyClient client = new ResteasyClientBuilder().build();
            ResteasyWebTarget  = client.target("https://api.twilio.com/2010-04-01/Accounts/AC99999999/Calls/CA77777777777.json");

            String credentials = "AC99999999:888888888";
            String base64encoded = Base64.getEncoder().encodeToString(credentials.getBytes());
            Response response = target.request().header(HttpHeaders.AUTHORIZATION, "Basic " + base64encoded).get();
            int status = response.getStatus();          

            if (status == 200) { //OK               
                Call call = response.readEntity(Call.class); //<------------- This fails!
                System.out.println(call);               
            }

        } catch (Exception e) {
            e.printStackTrace();
            System.exit(-1);
        }
    }

}

我想问你：
twilio-7.47.2-jar-with-dependencies.jar在内部使用了哪些“rest”库/工具（为了使用它而不是resteasy）？
如何正确获取json调用对象？用我得到的实际代码：
javax.ws.rs.processingexception:找不到内容类型为application/json且类型为class com.twilio.rest.api.v2010.account.call的messagebodyreader
编辑：我可以通过以下方式获得json格式的通话信息：

String call = response.readEntity(String.class);