Attempt to invoke virtual method 'void java.net.Socket.setReuseAddress(boolean)' on a null object reference

[preduseldavid]

I get this error and the socket connection is closed: Attempt to invoke virtual method 'void java.net.Socket.setReuseAddress(boolean)' on a null object reference

[Rapsssito]

@preduseldavid, thanks for your feedback, could you please provide your code, OS, RN version, library version, etc?

[preduseldavid]

Code:

async _connectToServer() {

    let options = {host: this._serverHost, port: this._serverPort};
    let loading = true;
    NetInfo.fetch().then(state => {
      if (state.isConnected) {
        let client = TcpSocket.createConnection(options, () => {
          if (!this._toastInternetShow && this._reconnecting)
            self.postMessage(
              JSON.stringify({
                event: 'toast_show',
                data: {
                  text: 'Connected Location',
                  loading: false,
                  timeout: 3000,
                },
              }),
            );
          else global.threadService.threadEventSend({event: 'toast_hide'});

          this._reconnecting = false;
          this._toastInternetShow = true;
          this._internetServiceEnabled = true;

          /* Do we have the location available? */
          let location = global.locationService.getLocation();
          if (global.locationService.locationIsAvailable(location)) {
            /* Register - send our location coords */
            this.updateLocation(location);
          }
          this._queueSendingPacketResume();
        });

        client.on('data', data => {
          if (loading) {
            loading = false;
            self.postMessage(
              JSON.stringify({
                event: 'groups_loading',
                data: {loading: false},
              }),
            );
          }
          this._readEvent(data);
        });

        client.on('error', error => {
          Reactotron.log(error);
          this._client.destroy();

          if (!this._reconnecting) {
            this._reconnecting = true;
            self.postMessage(
              JSON.stringify({
                event: 'toast_show',
                data: {
                  text: 'Reconnecting Location',
                  loading: true,
                  timeout: 3000,
                  onerror: true,
                },
              }),
            );
            setTimeout(this._connectCallback, 1000);
          }
        });

        client.on('close', () => {
          this._client.destroy();

          if (!this._reconnecting) {
            this._reconnecting = true;
            self.postMessage(
              JSON.stringify({
                event: 'toast_show',
                data: {
                  text: 'Reconnecting Location',
                  loading: true,
                  timeout: 3000,
                  onclose: true,
                },
              }),
            );
            setTimeout(this._connectCallback, 1000);
          }
        });

        this._client = client;
      } else {
        this._reconnecting = 1;
        this._internetServiceEnabled = false;
        if (this._toastInternetShow) {
          this._toastInternetShow = false;
          self.postMessage(
            JSON.stringify({
              event: 'toast_show',
              data: {
                text: 'You are Offline Location',
                loading: false,
                timeout: 3000,
                nointernet: true,
              },
            }),
          );
        }

        setTimeout(this._connectCallback, 2000);
      }
    });

  }

OS: Android RN Version: 0.62 library version: "react-native-tcp-socket": "^3.6.0",

[Rapsssito]

@preduseldavid, when does this error occur? Could you also share the full error trace?

[preduseldavid]

@Rapsssito I don't have the full error trace, but will share it when the error occurs again. Sometimes it appears, and the most of the times it doesn't... I want to also let you know that the connection is closed sometimes with this error: java.net.SocketException: Socket is not connected (and I use the above code)

[Rapsssito]

@preduseldavid, those kind of errors are probably caused by calling the socket before it has finished establishing the connection.

I see you declare this._client = client; before the TcpSocket.createConnection callback has been executed. This may lead to this kind of errors if you call this._client quickly enough. Try to move this declaration (this._client = client;) inside the callback:

let client = TcpSocket.createConnection(options, () => {
          this._client = client;
          if (!this._toastInternetShow && this._reconnecting)
          ...
});