FlexJson ClassNotFound Exception on Android 4.4.4

Question

I´ve got a multidex project for Android devices. I use Flexjson. I´ve already tested it with flexjson 3.3 and 2.x.

It works perfectly well with android 5.x but crashes in Android 4.4.4.

It looks like the Dex support library is not working propperly with older Android versions but I cannot tell.

Here´s my stacktrace:

 06-29 03:50:44.763  11884-11884/com.pigdroid.gameboard E/AndroidRuntime﹕ FATAL EXCEPTION: main
    Process: com.pigdroid.gameboard, PID: 11884
    flexjson.JSONException: [ layers.values ]:  Could not load com.pigdroid.game.board.tile.model.IntTileLayer
            at flexjson.ObjectBinder.findClassInMap(ObjectBinder.java:250)
            at flexjson.ObjectBinder.findClassName(ObjectBinder.java:213)
            at flexjson.ObjectBinder.bind(ObjectBinder.java:92)
            at flexjson.ObjectBinder.bindIntoCollection(ObjectBinder.java:110)
            at flexjson.factories.ListObjectFactory.instantiate(ListObjectFactory.java:13)
            at flexjson.ObjectBinder.bind(ObjectBinder.java:95)
            at flexjson.ObjectBinder.bindIntoObject(ObjectBinder.java:149)
            at flexjson.factories.ExistingObjectFactory.instantiate(ExistingObjectFactory.java:25)
            at flexjson.ObjectBinder.bind(ObjectBinder.java:95)
            at flexjson.ObjectBinder.bind(ObjectBinder.java:74)
            at flexjson.JSONDeserializer.deserialize(JSONDeserializer.java:241)
            at flexjson.JSONDeserializer.deserializeInto(JSONDeserializer.java:301)
            at com.pigdroid.game.model.memento.UndoableObject.from(UndoableObject.java:35)
            at com.pigdroid.game.controller.GameController.loadModelFromSerialized(GameController.java:108)
            at com.pigdroid.gameboard.view.detail.game.tile.TileBoardGameFragmentController.setGame(TileBoardGameFragmentController.java:692)
            at com.pigdroid.gameboard.view.detail.game.GameDetailFragment.onKickOff(GameDetailFragment.java:168)
            at com.pigdroid.gameboard.view.ServiceFragment.kickOffIf(ServiceFragment.java:71)
            at com.pigdroid.gameboard.view.detail.game.GameDetailFragment.kickOffIf(GameDetailFragment.java:159)
            at com.pigdroid.gameboard.view.ServiceFragment$3.bound(ServiceFragment.java:52)
            at com.pigdroid.gameboard.view.ServiceFragment$3.bound(ServiceFragment.java:48)
            at com.pigdroid.android.hateaidl.HateAIDLConnection$3.onServiceConnected(HateAIDLConnection.java:118)
            at android.app.LoadedApk$ServiceDispatcher.doConnected(LoadedApk.java:1101)
            at android.app.LoadedApk$ServiceDispatcher$RunConnection.run(LoadedApk.java:1118)
            at android.os.Handler.handleCallback(Handler.java:733)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:136)
            at android.app.ActivityThread.main(ActivityThread.java:5001)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
            at dalvik.system.NativeStart.main(Native Method)
     Caused by: java.lang.ClassNotFoundException: Didn't find class "com.pigdroid.game.board.tile.model.IntTileLayer" on path: DexPathList[[directory "."],nativeLibraryDirectories=[/system/lib]]
            at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
            at java.lang.ClassLoader.loadClass(ClassLoader.java:497)
            at java.lang.ClassLoader.loadClass(ClassLoader.java:457)
            at android.app.LoadedApk$WarningContextClassLoader.loadClass(LoadedApk.java:430)
            at flexjson.ObjectBinder.findClassInMap(ObjectBinder.java:243)
            at flexjson.ObjectBinder.findClassName(ObjectBinder.java:213)
            at flexjson.ObjectBinder.bind(ObjectBinder.java:92)
            at flexjson.ObjectBinder.bindIntoCollection(ObjectBinder.java:110)
            at flexjson.factories.ListObjectFactory.instantiate(ListObjectFactory.java:13)
            at flexjson.ObjectBinder.bind(ObjectBinder.java:95)
            at flexjson.ObjectBinder.bindIntoObject(ObjectBinder.java:149)
            at flexjson.factories.ExistingObjectFactory.instantiate(ExistingObjectFactory.java:25)
            at flexjson.ObjectBinder.bind(ObjectBinder.java:95)
            at flexjson.ObjectBinder.bind(ObjectBinder.java:74)
            at flexjson.JSONDeserializer.deserialize(JSONDeserializer.java:241)
            at flexjson.JSONDeserializer.deserializeInto(JSONDeserializer.java:301)
            at com.pigdroid.game.model.memento.UndoableObject.from(UndoableObject.java:35)
            at com.pigdroid.game.controller.GameController.loadModelFromSerialized(GameController.java:108)
            at com.pigdroid.gameboard.view.detail.game.tile.TileBoardGameFragmentController.setGame(TileBoardGameFragmentController.java:692)
            at com.pigdroid.gameboard.view.detail.game.GameDetailFragment.onKickOff(GameDetailFragment.java:168)
            at com.pigdroid.gameboard.view.ServiceFragment.kickOffIf(ServiceFragment.java:71)
            at com.pigdroid.gameboard.view.detail.game.GameDetailFragment.kickOffIf(GameDetailFragment.java:159)
            at com.pigdroid.gameboard.view.ServiceFragment$3.bound(ServiceFragment.java:52)
            at com.pigdroid.gameboard.view.ServiceFragment$3.bound(ServiceFragment.java:48)
            at com.pigdroid.android.hateaidl.HateAIDLConnection$3.onServiceConnected(HateAIDLConnection.java:118)
            at android.app.LoadedApk$ServiceDispatcher.doConnected(LoadedApk.java:1101)
            at android.app.LoadedApk$ServiceDispatcher$RunConnection.run(LoadedApk.java:1118)
            at android.os.Handler.handleCallback(Handler.java:733)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:136)
            at android.app.ActivityThread.main(ActivityThread.java:5001)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
            at dalvik.system.NativeStart.main(Native Method)

EDIT: I´ve filled an issue to the Android dev team and they´ve noted the bug as a feature, even when it works perfectly well on latter versions. If any found this anoying, please try to vote for reopening: https://code.google.com/p/android/issues/detail?id=178607

Answer 1

I´ve taken a look to the method failing ObjectBinder.findClassInMap they get the Class loader like this: ClassLoader classLoader = Thread.currentThread().getContextClassLoader();

I suppose there´s kind of a bad install of the multi dex class loader because I´ve set the loader myself before my deserialization occurs and it fixed the problem.

The line fixin' the error I´ve added just before loading my game model goes like this:

    Thread.currentThread().setContextClassLoader(owner.getActivity().getBaseContext().getClassLoader());