java.net.SocketException: socket failed: EPERM (Operation not permitted)

Question

I am working on an Android Studio project with several activities. I am currently trying to read the output from a Java Servlet on localhost but it seems to be crashing due to a socket permission.

I've made a new project, used the exact same code and worked perfectly. So I dont understand why is not willing to work on my project.

public class LoginActivity extends AppCompatActivity {


String apiUrl = "http://10.0.2.2:8080/ProyectService/Servlet?action=login";
EditText username;
EditText password;
AlertDialog dialog;
Usuario session;

@Override
public void onCreate(Bundle savedInstanceState) {
    // Inicializacion de ventana
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_login);
    getSupportActionBar().hide();

    // Inicializacion de componentes
    username = findViewById(R.id.username);
    password = findViewById(R.id.password);

    // Inicializacion de funcionalidad de botones
    Button button= (Button) findViewById(R.id.login);
    button.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
            UserLoginTask mAuthTask = new UserLoginTask();
            mAuthTask.execute();
        }
    });

    password = findViewById(R.id.password);
    createAlertDialog("Usuario o Contraseña Incorrectos");
    }

    private void createAlertDialog(String message){
    AlertDialog.Builder builder = new AlertDialog.Builder(this);
    builder.setMessage(message)
            .setTitle("Error");
    dialog = builder.create();
    }



    // ASYNCRONUS NETWORK PROCESS

    public class UserLoginTask extends AsyncTask<String, String, String> {

    @Override
    protected void onPreExecute() {
    }


    @Override
    protected String doInBackground(String... params) {

        // implement API in background and store the response in current variable
        String current = "";
        try {
            URL url;
            HttpURLConnection urlConnection = null;
            try {
                url = new URL(apiUrl);
                System.out.println(apiUrl);
                urlConnection = (HttpURLConnection) url
                        .openConnection();

                InputStream in = urlConnection.getInputStream();

                InputStreamReader isw = new InputStreamReader(in);

                int data = isw.read();
                while (data != -1) {
                    current += (char) data;
                    data = isw.read();
                    //System.out.print(current);

                }
                System.out.print(current);
                // return the data to onPostExecute method
                return current;

            } catch (Exception e) {
                e.printStackTrace();
            } finally {
                if (urlConnection != null) {
                    urlConnection.disconnect();
                }
            }

        } catch (Exception e) {
            e.printStackTrace();
            return "Exception: " + e.getMessage();
        }
        return current;
        }
    }

    protected void onPostExecute(String success) {
        Log.i(success, "");
       //attemptLogin();
    }
}

I Expect it to read the data but it crashes at this line:

InputStream in = urlConnection.getInputStream();

This is the error output:

java.net.SocketException: socket failed: EPERM (Operation not permitted)
at java.net.Socket.createImpl(Socket.java:492)
at java.net.Socket.getImpl(Socket.java:552)
at java.net.Socket.setSoTimeout(Socket.java:1180)
at com.android.okhttp.internal.io.RealConnection.connectSocket(RealConnection.java:143)
at com.android.okhttp.internal.io.RealConnection.connect(RealConnection.java:116)
at com.android.okhttp.internal.http.StreamAllocation.findConnection(StreamAllocation.java:186)
at com.android.okhttp.internal.http.StreamAllocation.findHealthyConnection(StreamAllocation.java:128)
at com.android.okhttp.internal.http.StreamAllocation.newStream(StreamAllocation.java:97)
at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:289)
at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:232)
at com.android.okhttp.internal.huc.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:465)
at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:411)
at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:248)
at com.example.controller.LoginActivity$UserLoginTask.doInBackground(LoginActivity.java:114)
at com.example.controller.LoginActivity$UserLoginTask.doInBackground(LoginActivity.java:93)
at android.os.AsyncTask$3.call(AsyncTask.java:378)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:289)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
at java.lang.Thread.run(Thread.java:919)

score 778 · Answer 1 · edited Jan 30 '23 at 02:10

778

Your app needs additional permissions and/or to be reinstalled.

Add additional permissions to AndroidManifest.xml within the <manifest> section:

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

To reinstall, uninstall the app from the emulator or physical connected device and then run it again. (If adding permissions, make sure to reinstall afterwards.)

edited Jan 30 '23 at 02:10

Dave

11,499
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answered May 23 '19 at 02:36

Aaron Villalobos

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13

it did work for me too, ever found why it was happening in the first place? – Vikas Pandey Jun 04 '19 at 13:18
27

In my case I had to provide ACCESS_NETWORK_STATE permission. Add to manifest. And uninstall too – sk md Jun 13 '19 at 12:46
4

Same here. It's odd that the question is so young. Maybe this is a bug. – user1511417 Jul 01 '19 at 11:43
java.net.ConnectException: Failed to connect to still not working – Fahad Bhuyian Jul 26 '19 at 21:42
@FahadBhuyian try to add permission to use INTERNET inside of `AndroidManifest.xml` file `````` right before the application tag. – Silambarasan R Aug 28 '19 at 07:23
2

Removed application from an emulator and install again solved my problem, thanks. Seems that firebase cache something to the filesystem and reuse it, I suppose clear application data also will solve a problem. – Onregs Sep 12 '19 at 08:47
1

Why does this happen in the first place thought? Anyone have a hint on what may be the cause of this? – Pedro Lopes Sep 20 '19 at 18:06
4

maybe permission are cached already and ruining it again and again is not updating permission and instead of updating src files only.? that's re-installation helped. – Atif AbbAsi Oct 09 '19 at 11:05
1

Uninstall and Re-install worked for me. But am providing an update to my existing app and so cannot just ask all my users to just uninstall and re-install the new version for my production release. Is there any way around if anyone has figure out yet? – Malay Shah Jan 28 '21 at 20:37
it did work for me too, uninstall my app and run on Android Studio 4.1.2 – Andy Romero May 18 '21 at 18:22
I was getting the same error trying to load image URLs with Glide using `` Uninstalling the app fixed it for me! – TecBrat Jun 09 '21 at 20:00
As a beginner, I've been around 3 days figuring out why my simple load image app not working, I've make sure permission added also add clearTextHttp as true in the manifest, little did I know I have to do this, we need better developer experience – Nald Dev Mar 18 '22 at 22:32
Mostly if you modify AndroidManifest.xml you might need to uninstall and run again. – Anuj Nov 07 '22 at 23:19

score 112 · Answer 2 · edited Aug 27 '21 at 06:35

112

Just uninstall the app from the emulator then run again and it’ll work. I had the same issue

To uninstall the app run your project when "the application had stopped" message appear click "app info" then uninstall.

edited Aug 27 '21 at 06:35

Reid

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answered Nov 10 '19 at 20:04

John Alexander

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3

I don't know how, but this works. Posting in December 2019. Though this works, curious to know why. – Rajkiran Dec 08 '19 at 10:03
3

It is December 2021 and unbelievably this fix still works in an emulator with API 29. – mcy Dec 02 '21 at 08:15
Damn! I've lost an entire day with this. Thank you! – sebasira Jan 12 '22 at 19:16
I just feel this is ridiculous, but it's work, LOL. Anyway, thx – ahmfarisi Jul 05 '22 at 17:33

score 76 · Answer 3 · answered Sep 02 '19 at 19:36

76

First of all you need change your android manifest .xml But after this action you must uninstall application and run it again. https://developer.android.com/training/basics/network-ops/connecting

and code here:

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

in AndroidManifest.xml

answered Sep 02 '19 at 19:36

Archil Labadze

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True, though if that is already set and still getting the same error - do as suggested above - delete app on device and install it again. – Vladislav Varslavans Apr 19 '20 at 14:39
1

2021 and i still get this issue – raditya gumay Aug 30 '21 at 04:21
Did you reinstall app? – Archil Labadze Aug 30 '21 at 06:16

score 33 · Answer 4 · answered Jan 05 '21 at 16:52

33

If you forgot to add <uses-permission android:name="android.permission.INTERNET" /> to your Manifest.xml, do it now

If you already added it but the error persists, uninstall the app first then run i again.
More often than not I run into the same issue because I forgot <uses-permission android:name="android.permission.INTERNET" /> in my first installation.
The OS thought the app doesn't need Internet permission (which is dumb IMO) and would not check any permission update to the app (which is even dumber IMO).

The only way to tell the Android OS to check your updated permission requests is to uninstall the app first before installing again.

I think neither

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
nor android:usesCleartextTraffic="true" really matters here

answered Jan 05 '21 at 16:52

ericn

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Uninstalled and install app again worked for me. – Ali Akram Jan 18 '21 at 09:09
2

The only answer providing an actual explanation! – Florian Walther Jan 30 '21 at 14:03
1

it was useful for me, but i consider that it should not be a solution. I am considered it is a android bug. :( – Alejandro Gonzalez May 27 '21 at 03:28
1

bro may a higher power reward you in some way wherever you are! I had taken like 5 hours trying to find a solution but the unistall reinstall tip just saved my day. Thanks bro. Yoiur solution deserved to be marked as the answer. – NMukama Jul 29 '21 at 16:57

score 18 · Answer 5 · answered Nov 07 '19 at 13:21

18

I had to uninstall the app from the emulator and then everything started to work. I just needed the folowing permission on the AndroidManifest.xml

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

answered Nov 07 '19 at 13:21

Juan Cabello

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score 13 · Answer 6 · answered Dec 03 '19 at 12:05

13

Add ACCESS_NETWORK_STATE permission in manifest
Reinstallation emulator

answered Dec 03 '19 at 12:05

AK IJ

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Mazhar Ghulam · Answer 7 · 2020-12-17T13:45:37.533

10

I had the same issue in android emulator, even after adding

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

and

android:usesCleartextTraffic="true"

and reinstalling the app still had the issue on my emulator.

AVD Manager -> Right click -> Cold Boot now

solved my issue, looks like if we ran the app initially without adding internet permissions / clearTextTraffic we might need to cold boot as it store some cache.

edited Dec 17 '20 at 13:45

answered Dec 03 '20 at 14:25

Mazhar Ghulam

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Cold booting helped this time. – cslotty Apr 08 '21 at 11:20

score 7 · Answer 8 · answered Oct 07 '21 at 11:30

Working solution.

check if you have INTERNET permission and ACCESS_NETWORK_STATE permission, if not add these.

uninstall the app and install again. If not try in different device. It will work 100%. I face same issue and solved this by using these steps.

score 6 · Answer 9 · answered May 01 '20 at 23:02

6

Set android:usesCleartextTraffic="true" in the manifest file. Add the permission INTERNET. Uninstall app and then install again.

answered May 01 '20 at 23:02

Gilbert

2,699
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score 6 · Answer 10 · answered Nov 28 '20 at 18:56

6

Set android:usesCleartextTraffic="true" in the manifest file. Add the permission INTERNET. Uninstall app and then install again.its work to me

answered Nov 28 '20 at 18:56

Kavindu Dissanayake

643
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Chosen · Answer 11 · 2021-04-22T13:59:26.660

If you are using a localhost server on your Mac then use the local IP address that is assigned for your machine as your API address. i.e. 192.168.x.x (find it in Settings -> Network) not localhost nor 127.0.0.1.

As they mentioned above, uninstall the app and then put these tags in your manifest:

in the application section:

android:usesCleartextTraffic="true"

Then in your manifest section:

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.a.myapp">
    <uses-permission android:name="android.permission.INTERNET" />

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

score 1 · Answer 12 · answered Nov 27 '19 at 15:50

If anyone still has this issue I encountered it when I used VPN and tried to connect to wifi while cellular was on. I was using Anyconnect VPN client. Solution is to enable the allow bypass that will let you bind a socket to a specific network if this is what you are looking for.

AnyConnect only uses allowBypass if it's configured in its managed restrictions (by EMM), via this key: vpn_connection_allow_bypass.

score 0 · Answer 13 · edited Oct 20 '20 at 07:29

0

I had to delete this

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

and keep this

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

edited Oct 20 '20 at 07:29

Martijn Pieters

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answered Oct 20 '20 at 01:59

khoane

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score 0 · Answer 14 · edited Aug 03 '21 at 11:27

0

I am a little late to this but I encountered this problem and I found out that android:usesCleartextTraffic requires minimum API version of 23. Therefore, in the module gradle build file, switch the minimum version to 23 and it should work.

edited Aug 03 '21 at 11:27

Dharman

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answered Aug 03 '21 at 11:21

Lakindu Hewawasam

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score 0 · Answer 15 · answered Apr 27 '23 at 21:22

0

uninstall the app from the emulator and try again

answered Apr 27 '23 at 21:22

Mostafa Mohamed

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2

score 0 · Answer 16 · answered Jul 14 '23 at 12:09

0

uninstalling the app did the trick for me,specially if you're working on emulator

answered Jul 14 '23 at 12:09

Ahmed Nabil

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1
7

java.net.SocketException: socket failed: EPERM (Operation not permitted)

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