error receiving JSON from url

Following the answer given to the question:

Android: read JSON data

That's exactly the same problem as mine, I got in class:

package com.example.carlos.radiosingular.classes;

import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

public class HttpConnections {
    //método get
    public static String get(String urlString){
        HttpURLConnection urlConnection = null;
        BufferedReader reader = null;
        String resposta = null;
        try {
            URL url = new URL(urlString);
            urlConnection = (HttpURLConnection) url.openConnection();
            urlConnection.connect();

            InputStream in = new BufferedInputStream(urlConnection.getInputStream());

            reader = new BufferedReader(new InputStreamReader(in));
            String line = "";
            StringBuffer buffer = new StringBuffer();
            while ((line = reader.readLine()) != null){
                buffer.append(line);
            }
            resposta = buffer.toString();
        }catch (Exception e){
            e.printStackTrace();
        }finally {
            if (urlConnection != null){
                urlConnection.disconnect();
            }
            try {
                reader.close();
            }catch (Exception e){
                e.printStackTrace();
            }
        }
        return resposta;
    }
}

My% s of% primary :

package com.example.carlos.radiosingular;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;

import com.example.carlos.radiosingular.classes.HttpConnections;


public class form extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.form);
        String resposta = HttpConnections.get("http://hotplateprensas.com.br/ws/clientest.php");
        Log.v("Resposta: ", resposta);
    }

}

Error in my Moto G 4 Play (I'm emulating right on the device)

RadioSingular parou
  Abri App novamente

RUN console error

D/AndroidRuntime: Shutting down VM
E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.carlos.radiosingular, PID: 21972
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.carlos.radiosingular/com.example.carlos.radiosingular.form}: java.lang.NullPointerException: println needs a message
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2678)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2743)
        at android.app.ActivityThread.-wrap12(ActivityThread.java)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1490)
        at android.os.Handler.dispatchMessage(Handler.java:102)
        at android.os.Looper.loop(Looper.java:154)
        at android.app.ActivityThread.main(ActivityThread.java:6165)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:888)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:778)
     Caused by: java.lang.NullPointerException: println needs a message
        at android.util.Log.println_native_inner(Native Method)
        at android.util.Log.println_native(Log.java:294)
        at android.util.Log.v(Log.java:306)
        at com.example.carlos.radiosingular.form.onCreate(form.java:17)
        at android.app.Activity.performCreate(Activity.java:6687)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1140)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2631)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2743) 
        at android.app.ActivityThread.-wrap12(ActivityThread.java) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1490) 
        at android.os.Handler.dispatchMessage(Handler.java:102) 
        at android.os.Looper.loop(Looper.java:154) 
        at android.app.ActivityThread.main(ActivityThread.java:6165) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:888) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:778) 

Errors in classe (last lines only)

2018-12-13 10:36:14.455 22364-22415/? E/GmsUtils: Failed to connect to Google API client: ConnectionResult{statusCode=API_UNAVAILABLE, resolution=null, message=null}
2018-12-13 10:36:29.136 4236-20786/? E/SQLiteCastStore: Skip saving CastDeviceInfo: "Dispositivo próximo" (__cast_nearby___V_d580d25c-abe2-4303-9f7d-361d2bee8a9f)
2018-12-13 10:36:34.251 393-2691/? E/NetlinkEvent: NetlinkEvent::FindParam(): Parameter 'UID' not found

What to do?

The error gives the line:

    Log.v("Resposta: ", resposta);

When I comment on it, it does not make a mistake.

If the answer is a string:

String resposta = HttpConnections.get("http://hotplateprensas.com.br/ws/clientest.php");

and, commenting

//Log.v("Resposta: ", resposta);

The error some,

It does not make sense for me once running in the browser, the url link , brings me as a return one Logcat correctly:

[
  {"idClientesT":"1","tipo":"s","nome":"Carlos"}, 
  {"idClientesT":"2","tipo":"s","nome":"Rogério"}
]

Where is the error?

EDIT:

No JSON did so:

<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

Even so, give the error!