Exception thown when encode an empty string using MMKV flutter plugin

[CreeperSan]

The language of MMKV

dart

The version of MMKV

1.2.8

The platform of MMKV

Flutter

The installation of MMKV

e.g. Cocoapods, Carthage, Maven, AAR Package or Git clone

What's the issue?

Can not set an empty string into mmkv.

                  MMKV.initialize().then((value){
                    print('path : $value');
                    MMKV mmkv = MMKV('test_empty_string');
                    mmkv.encodeString('empty_string', 'value');
                    mmkv.encodeString('empty_string', '');   // Exception thrown
                  });

What's the log of MMKV when that happened?

Syncing files to device MI 6... W/.fluttertestap(18054): Accessing hidden method Lsun/misc/Unsafe;->getUnsafe()Lsun/misc/Unsafe; (greylist,core-platform-api, linking, allowed) W/.fluttertestap(18054): Accessing hidden method Lsun/misc/Unsafe;->objectFieldOffset(Ljava/lang/reflect/Field;)J (greylist,core-platform-api, linking, allowed) W/.fluttertestap(18054): Accessing hidden method Lsun/misc/Unsafe;->compareAndSwapObject(Ljava/lang/Object;JLjava/lang/Object;Ljava/lang/Object;)Z (greylist, linking, allowed) W/.fluttertestap(18054): Accessing hidden method Lsun/misc/Unsafe;->putObject(Ljava/lang/Object;JLjava/lang/Object;)V (greylist, linking, allowed) I/MMKV (18054): version v1.2.7 page size:4096 I/MMKV (18054): armv8 AES instructions is supported I/MMKV (18054): armv8 CRC32 instructions is supported I/MMKV (18054): root dir: /data/user/0/com.example.fluttertestapp/app_flutter/mmkv I/flutter (18054): path : /data/user/0/com.example.fluttertestapp/app_flutter/mmkv I/MMKV (18054): loading [test_empty_string] with 0 actual size, file size 4096, InterProcess 0, meta info version:1 I/MMKV (18054): loaded [test_empty_string] with 0 key-values E/flutter (18054): [ERROR:flutter/lib/ui/ui_dart_state.cc(177)] Unhandled Exception: NoSuchMethodError: The method 'setAll' was called on null. E/flutter (18054): Receiver: null E/flutter (18054): Tried calling: setAll(0, Uint8Array) E/flutter (18054): #0 Object.noSuchMethod (dart:core-patch/object_patch.dart:51:5) E/flutter (18054): #1 MMBuffer.fromList (package:mmkv/mmkv.dart:65:21) E/flutter (18054): #2 MMKV.encodeString (package:mmkv/mmkv.dart:270:26) E/flutter (18054): #3 _TestTextFieldState.build.. (package:fluttertestapp/test_text_field.dart:29:26) E/flutter (18054): #4 _rootRunUnary (dart:async/zone.dart:1198:47) E/flutter (18054): #5 _CustomZone.runUnary (dart:async/zone.dart:1100:19) E/flutter (18054): #6 _FutureListener.handleValue (dart:async/future_impl.dart:143:18) E/flutter (18054): #7 Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:696:45) E/flutter (18054): #8 Future._propagateToListeners (dart:async/future_impl.dart:725:32) E/flutter (18054): #9 Future._completeWithValue (dart:async/future_impl.dart:529:5) E/flutter (18054): #10 _AsyncAwaitCompleter.complete (dart:async-patch/async_patch.dart:40:15) E/flutter (18054): #11 _completeOnAsyncReturn (dart:async-patch/async_patch.dart:311:13) E/flutter (18054): #12 MMKV.initialize (package:mmkv/mmkv.dart) E/flutter (18054): E/flutter (18054): #13 _TestTextFieldState.build. (package:fluttertestapp/test_text_field.dart:25:24) E/flutter (18054): #14 _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:993:19) E/flutter (18054): #15 _InkResponseState.build. (package:flutter/src/material/ink_well.dart:1111:38) E/flutter (18054): #16 GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:183:24) E/flutter (18054): #17 TapGestureRecognizer.handleTapUp (package:flutter/src/gestures/tap.dart:598:11) E/flutter (18054): #18 BaseTapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:287:5) E/flutter (18054): #19 BaseTapGestureRecognizer.acceptGesture (package:flutter/src/gestures/tap.dart:259:7) E/flutter (18054): #20 GestureArenaManager.sweep (package:flutter/src/gestures/arena.dart:157:27) E/flutter (18054): #21 GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:362:20) E/flutter (18054): #22 GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:338:22) E/flutter (18054): #23 RendererBinding.dispatchEvent (package:flutter/src/rendering/binding.dart:267:11) E/flutter (18054): #24 GestureBinding._handlePointerEvent (package:flutter/src/gestures/binding.dart:295:7) E/flutter (18054): #25 GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:240:7) E/flutter (18054): #26 GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:213:7) E/flutter (18054): #27 _rootRunUnary (dart:async/zone.dart:1206:13) E/flutter (18054): #28 _CustomZone.runUnary (dart:async/zone.dart:1100:19) E/flutter (18054): #29 _CustomZone.runUnaryGuarded (dart:async/zone.dart:1005:7) E/flutter (18054): #30 _invoke1 (dart:ui/hooks.dart:265:10) E/flutter (18054): #31 _dispatchPointerDataPacket (dart:ui/hooks.dart:174:5) E/flutter (18054):

Am i using MMKV in a wrong way?

[lingol]

It looks like a bug and I will look into it. For the moment, why not just delete the key?

[lingol]

Released with v1.2.8.