JSONObject returns a non null value of "null" after instantiating with string

I need to download JSON and then store it in JSONObject.

I am using org.json.JSONArray.

Here's all the code in one place:

import org.json.JSONException;
import org.json.JSONObject;

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

public class Test
{
    public static JSONObject getJSON()
    {
    try
    {
        URL uri = new URL("http://events.makeable.dk/api/getEvents");
        HttpURLConnection urlConnection = (HttpURLConnection) uri.openConnection();
        if (urlConnection.getResponseCode() != HttpURLConnection.HTTP_OK)
        {
            return null;
        }

        InputStream inputStream = urlConnection.getInputStream();

        if (inputStream != null)
        {
            BufferedReader br = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"));
            StringBuffer buffer = new StringBuffer();

            try
            {
                String line;
                while ((line = br.readLine()) != null)
                {
                    buffer.append(line);
                }
                br.close();
            }
            catch (IOException e)
            {
                e.printStackTrace();
            }



            String json = buffer.toString();

            JSONObject jObject = null;
            try {
                jObject = new JSONObject(json);
            }
            catch (JSONException e) {
                e.printStackTrace();

            }
            int i = 1;
            return jObject;
        }
    }
    catch (Exception e)
    {
        e.printStackTrace();
    }
    return null;
}
}

Testing method

 @Test
    public void addition_isCorrect() throws Exception
    {
        JSONObject json = Test.getJSON();
        assertNotNull(json);
        assertTrue(json.length()>0);
    }

First assert passes, the second doesn't, cause length == 0.

And what I get is this. A JSONObject object with value of string "null".

No exception is thrown. I wrote the contents of buffer to file and validated it, and it validates fine.

Another picture https://i.sstatic.net/Dw9ug.png

Why is it acting like this?

Gradle

apply plugin: 'com.android.application'

android {

testOptions {
    unitTests.returnDefaultValues = true
}
compileSdkVersion 23
buildToolsVersion "24.0.0 rc3"

defaultConfig {
    applicationId "baaa.myapplication"
    minSdkVersion 23
    targetSdkVersion 23
    versionCode 1
    versionName "1.0"
}
buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
    }
}
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    testCompile 'junit:junit:4.12'
    compile 'com.android.support:appcompat-v7:23.+'
}