Program: 11382
Project: 11382
Buggy source:
@Override public void onServicesDiscovered(final BluetoothGatt gatt,int status){
  super.onServicesDiscovered(gatt,status);
  Log.i(Constants.TAG,"String_Node_Str" + status);
  if (status != BluetoothGatt.GATT_SUCCESS) {
    return;
  }
  final String gattDeviceAddress=gatt.getDevice().getAddress();
  if (midiInputDevicesMap.containsKey(gattDeviceAddress)) {
synchronized (midiInputDevicesMap) {
      Set<MidiInputDevice> midiInputDevices=midiInputDevicesMap.get(gattDeviceAddress);
      for (      MidiInputDevice midiInputDevice : midiInputDevices) {
        midiInputDevice.close();
      }
      midiInputDevicesMap.remove(gattDeviceAddress);
    }
  }
  MidiInputDevice midiInputDevice=MidiInputDevice.getInstance(context,gatt);
  if (midiInputDevice != null) {
synchronized (midiInputDevicesMap) {
      Set<MidiInputDevice> midiInputDevices=midiInputDevicesMap.get(gattDeviceAddress);
      if (midiInputDevices == null) {
        midiInputDevices=new HashSet<MidiInputDevice>();
        midiInputDevicesMap.put(gattDeviceAddress,midiInputDevices);
      }
      midiInputDevices.add(midiInputDevice);
    }
    Log.d(Constants.TAG,"String_Node_Str" + midiInputDevice.getDeviceName());
    if (midiDeviceAttachedListener != null) {
      midiDeviceAttachedListener.onMidiInputDeviceAttached(midiInputDevice);
    }
  }
  if (midiOutputDevicesMap.containsKey(gattDeviceAddress)) {
synchronized (midiOutputDevicesMap) {
      Set<MidiOutputDevice> midiOutputDevices=midiOutputDevicesMap.get(gattDeviceAddress);
      for (      MidiOutputDevice midiOutputDevice : midiOutputDevices) {
        midiOutputDevice.close();
      }
      midiOutputDevicesMap.remove(gattDeviceAddress);
    }
  }
  MidiOutputDevice midiOutputDevice=MidiOutputDevice.getInstance(context,gatt);
  if (midiOutputDevice != null) {
synchronized (midiOutputDevicesMap) {
      Set<MidiOutputDevice> midiOutputDevices=midiOutputDevicesMap.get(gattDeviceAddress);
      if (midiOutputDevices == null) {
        midiOutputDevices=new HashSet<MidiOutputDevice>();
        midiOutputDevicesMap.put(gattDeviceAddress,midiOutputDevices);
      }
      midiOutputDevices.add(midiOutputDevice);
    }
    Log.d(Constants.TAG,"String_Node_Str" + midiOutputDevice.getDeviceName());
    if (midiDeviceAttachedListener != null) {
      midiDeviceAttachedListener.onMidiOutputDeviceAttached(midiOutputDevice);
    }
  }
  if (midiInputDevice != null || midiOutputDevice != null) {
    BluetoothDevice bluetoothDevice=gatt.getDevice();
    if (bluetoothDevice.getBondState() == BluetoothDevice.BOND_NONE) {
      Log.i(Constants.TAG,"String_Node_Str" + bluetoothDevice.getName());
      bluetoothDevice.createBond();
      bluetoothDevice.setPairingConfirmation(true);
      IntentFilter filter=new IntentFilter(BluetoothDevice.ACTION_BOND_STATE_CHANGED);
      bondingBroadcastReceiver=new BondingBroadcastReceiver(midiInputDevice,midiOutputDevice);
      context.registerReceiver(bondingBroadcastReceiver,filter);
    }
 else {
      if (midiInputDevice != null) {
        midiInputDevice.open();
      }
      if (midiOutputDevice != null) {
        midiOutputDevice.open();
      }
    }
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
      gatt.requestMtu(23);
      gatt.requestConnectionPriority(BluetoothGatt.CONNECTION_PRIORITY_HIGH);
    }
  }
}

Fixed version (ground truth):
@SuppressLint("String_Node_Str") @Override public void onServicesDiscovered(final BluetoothGatt gatt,int status){
  super.onServicesDiscovered(gatt,status);
  Log.i(Constants.TAG,"String_Node_Str" + status);
  if (status != BluetoothGatt.GATT_SUCCESS) {
    return;
  }
  final String gattDeviceAddress=gatt.getDevice().getAddress();
  if (midiInputDevicesMap.containsKey(gattDeviceAddress)) {
synchronized (midiInputDevicesMap) {
      Set<MidiInputDevice> midiInputDevices=midiInputDevicesMap.get(gattDeviceAddress);
      for (      MidiInputDevice midiInputDevice : midiInputDevices) {
        midiInputDevice.close();
      }
      midiInputDevicesMap.remove(gattDeviceAddress);
    }
  }
  MidiInputDevice midiInputDevice=MidiInputDevice.getInstance(context,gatt);
  if (midiInputDevice != null) {
synchronized (midiInputDevicesMap) {
      Set<MidiInputDevice> midiInputDevices=midiInputDevicesMap.get(gattDeviceAddress);
      if (midiInputDevices == null) {
        midiInputDevices=new HashSet<MidiInputDevice>();
        midiInputDevicesMap.put(gattDeviceAddress,midiInputDevices);
      }
      midiInputDevices.add(midiInputDevice);
    }
    Log.d(Constants.TAG,"String_Node_Str" + midiInputDevice.getDeviceName());
    if (midiDeviceAttachedListener != null) {
      midiDeviceAttachedListener.onMidiInputDeviceAttached(midiInputDevice);
    }
  }
  if (midiOutputDevicesMap.containsKey(gattDeviceAddress)) {
synchronized (midiOutputDevicesMap) {
      Set<MidiOutputDevice> midiOutputDevices=midiOutputDevicesMap.get(gattDeviceAddress);
      for (      MidiOutputDevice midiOutputDevice : midiOutputDevices) {
        midiOutputDevice.close();
      }
      midiOutputDevicesMap.remove(gattDeviceAddress);
    }
  }
  MidiOutputDevice midiOutputDevice=MidiOutputDevice.getInstance(context,gatt);
  if (midiOutputDevice != null) {
synchronized (midiOutputDevicesMap) {
      Set<MidiOutputDevice> midiOutputDevices=midiOutputDevicesMap.get(gattDeviceAddress);
      if (midiOutputDevices == null) {
        midiOutputDevices=new HashSet<MidiOutputDevice>();
        midiOutputDevicesMap.put(gattDeviceAddress,midiOutputDevices);
      }
      midiOutputDevices.add(midiOutputDevice);
    }
    Log.d(Constants.TAG,"String_Node_Str" + midiOutputDevice.getDeviceName());
    if (midiDeviceAttachedListener != null) {
      midiDeviceAttachedListener.onMidiOutputDeviceAttached(midiOutputDevice);
    }
  }
  if (midiInputDevice != null || midiOutputDevice != null) {
    BluetoothDevice bluetoothDevice=gatt.getDevice();
    if (bluetoothDevice.getBondState() == BluetoothDevice.BOND_NONE) {
      Log.i(Constants.TAG,"String_Node_Str" + bluetoothDevice.getName());
      bluetoothDevice.createBond();
      bluetoothDevice.setPairingConfirmation(true);
      IntentFilter filter=new IntentFilter(BluetoothDevice.ACTION_BOND_STATE_CHANGED);
      bondingBroadcastReceiver=new BondingBroadcastReceiver(midiInputDevice,midiOutputDevice);
      context.registerReceiver(bondingBroadcastReceiver,filter);
    }
 else {
      if (midiInputDevice != null) {
        midiInputDevice.open();
      }
      if (midiOutputDevice != null) {
        midiOutputDevice.open();
      }
    }
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
      gatt.requestMtu(23);
      gatt.requestConnectionPriority(BluetoothGatt.CONNECTION_PRIORITY_HIGH);
    }
  }
}