[Demonstration 1]

[Buggy Method]
private boolean connect(String portName, int speed) throws Exception {
    try {
        System.setProperty("gnu.io.rxtx.SerialPorts", portName);
        portIdentifier = null;
        portIdentifier = CommPortIdentifier.getPortIdentifier(portName);
        if (portIdentifier.isCurrentlyOwned()) {
            LOG.error("Error: Port is currently in use:" + portName + " by: " + portIdentifier.getCurrentOwner());
            disconnect();
            return false;
        } else {
            serialPort = (SerialPort) portIdentifier.open(this.getClass().getName(), 2000);
            if (serialPort instanceof SerialPort) {
                serialPort.setSerialPortParams(speed, SerialPort.DATABITS_8, SerialPort.STOPBITS_1, SerialPort.PARITY_NONE);
                serialPort.setFlowControlMode(SerialPort.FLOWCONTROL_NONE);
                serialPort.enableReceiveTimeout(2000);
                serialPort.notifyOnDataAvailable(true);
                try {
                    serialReader = new SerialReader(this);
                    serialPort.addEventListener(serialReader);
                    LOG.debug("Added SerialPort event listener");
                } catch (TooManyListenersException e) {
                    disconnect();
                    throw new Exception("Error Too Many Listeners Exception on  serial port:" + e.getMessage());
                }
                in = serialPort.getInputStream();
                ou = serialPort.getOutputStream();
                LOG.info("Connection on " + portName + " established");
                setConnected(true);
                return true;
            } else {
                LOG.error("Error on serial port connection:" + portName);
                disconnect();
                return false;
            }
        }
    } catch (NoSuchPortException e) {
        disconnect();
        LOG.error("the connection could not be made: NoSuchPortException " + portName);
        return false;
    } catch (PortInUseException e) {
        disconnect();
        LOG.error("the connection could not be made: PortInUseException");
        return false;
    } catch (UnsupportedCommOperationException e) {
        disconnect();
        LOG.error("the connection could not be made: UnsupportedCommOperationException");
        return false;
    }
}

[Buggy Hunk]
private boolean connect(String portName, int speed) throws Exception {

[Patch]
private synchronized boolean connect(String portName, int speed) throws Exception {

[Demonstration 2]

[Buggy Method]
@Override
public void onClick(View view, int position) {
    String s = localsList.getLocals().get(position).getNome();
    Bundle bundle = new Bundle();
    bundle.putString("restaurantName", s);
    RestaurantDetailFragment restaurantDetailFragment = new RestaurantDetailFragment();
    restaurantDetailFragment.setArguments(bundle);
    activity.getFragmentManager().beginTransaction().replace(R.id.fragment, restaurantDetailFragment).addToBackStack(null).commit();
    menu.setChecked(false);
    activity.setBackArrow();
}

[Buggy Hunk]
activity.getFragmentManager().beginTransaction()

[Patch]
getFragmentManager().beginTransaction()

[Demonstration 3]

[Buggy Method]
private void connect() {
    if (connection != null)
        connection.close();
    SerialPort port = SerialPort.getCommPorts()[0];
    connection = new SerialConnection(port, 9600);
    if (!connection.isOpen() || connection == null) {
        JOptionPane.showMessageDialog(null, "Не вдалось встановити зв'язок");
        return;
    }
    connection.addOnSendListener(this);
    connection.addOnReceiveListener(this);
}

[Buggy Hunk]
SerialPort port = SerialPort.getCommPorts()[0];

[Patch]
SerialPort port = SerialPort.getCommPorts()[2];