NoClassDefFoundError - Android 2.3.X

Question

I have a Task defined in a class. Fatal exception "NoClassDefFoundError" is happening on following line

MyCuteTask myTask = new MyCuteTask(equations)

Here is the code

public class MyClass  {

    public void run() {
        MyCuteTask myTask = new MyCuteTask(equations)
    }

    protected class MyCuteTask extends  AsyncTask<String, Integer, String> {
        ...
    }
}

Recently, I have strange bug reports. Android throw an exception when I instantiate my task. I have this bug with android 2.3.X only.

Do any of you got the same bug?

EDIT: Here is the stack Trace

java.lang.NoClassDefFoundError: com.mathssolver.main.k
   at com.mathssolver.main.Logic.updateGraph(Logic.java:310)
   at com.mathssolver.main.Graph.update(Graph.java:249)
   at com.mathssolver.main.MathGraphFragment.plotFunction(MathGraphFragment.java:236)
   at com.mathssolver.main.MathGraphFragment.plot(MathGraphFragment.java:158)
   at com.mathssolver.main.MathGraphFragment.showExample(MathGraphFragment.java:141)
   at com.mathssolver.main.MathGraphFragment.onStart(MathGraphFragment.java:109)
   at android.support.v4.app.Fragment.performStart(Fragment.java:1810)
   at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:977)
   at android.support.v4.app.FragmentManagerImpl.performPendingDeferredStart(FragmentManager.java:842)
   at android.support.v4.app.FragmentManagerImpl.startPendingDeferredFragments(FragmentManager.java:1150)
   at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1506)
   at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:486)
   at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:141)
   at android.support.v4.view.ViewPager.populate(ViewPager.java:1073)
   at android.support.v4.view.ViewPager.populate(ViewPager.java:919)
   at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1441)
   at android.view.View.measure(View.java:8323)
   at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:581)
   at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:365)
   at android.view.View.measure(View.java:8323)
   at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138)
   at android.widget.FrameLayout.onMeasure(FrameLayout.java:250)
   at android.view.View.measure(View.java:8323)
   at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138)
   at android.support.v7.internal.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java:453)
   at android.view.View.measure(View.java:8323)
   at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138)
   at android.widget.FrameLayout.onMeasure(FrameLayout.java:250)
   at android.view.View.measure(View.java:8323)
   at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138)
   at android.widget.FrameLayout.onMeasure(FrameLayout.java:250)
   at android.view.View.measure(View.java:8323)
   at android.view.ViewRoot.performTraversals(ViewRoot.java:842)
   at android.view.ViewRoot.handleMessage(ViewRoot.java:1862)
   at android.os.Handler.dispatchMessage(Handler.java:99)
   at android.os.Looper.loop(Looper.java:130)
   at android.app.ActivityThread.main(ActivityThread.java:3806)
   at java.lang.reflect.Method.invokeNative(Method.java)
   at java.lang.reflect.Method.invoke(Method.java:507)
   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
   at dalvik.system.NativeStart.main(NativeStart.java)
Caused by: java.lang.ClassNotFoundException: com.mathssolver.main.k in loader dalvik.system.PathClassLoader[/data/app/com.shakti.mathssolver-1.apk]
   at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:240)
   at java.lang.ClassLoader.loadClass(ClassLoader.java:551)
   at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
   at com.mathssolver.main.Logic.updateGraph(Logic.java:310)
   at com.mathssolver.main.Graph.update(Graph.java:249)
   at com.mathssolver.main.MathGraphFragment.plotFunction(MathGraphFragment.java:236)
   at com.mathssolver.main.MathGraphFragment.plot(MathGraphFragment.java:158)
   at com.mathssolver.main.MathGraphFragment.showExample(MathGraphFragment.java:141)
   at com.mathssolver.main.MathGraphFragment.onStart(MathGraphFragment.java:109)
   at android.support.v4.app.Fragment.performStart(Fragment.java:1810)
   at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:977)
   at android.support.v4.app.FragmentManagerImpl.performPendingDeferredStart(FragmentManager.java:842)
   at android.support.v4.app.FragmentManagerImpl.startPendingDeferredFragments(FragmentManager.java:1150)
   at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1506)
   at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:486)
   at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:141)
   at android.support.v4.view.ViewPager.populate(ViewPager.java:1073)
   at android.support.v4.view.ViewPager.populate(ViewPager.java:919)
   at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1441)
   at android.view.View.measure(View.java:8323)
   at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:581)
   at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:365)
   at android.view.View.measure(View.java:8323)
   at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138)
   at android.widget.FrameLayout.onMeasure(FrameLayout.java:250)
   at android.view.View.measure(View.java:8323)
   at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138)
   at android.support.v7.internal.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java:453)
   at android.view.View.measure(View.java:8323)
   at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138)
   at android.widget.FrameLayout.onMeasure(FrameLayout.java:250)
   at android.view.View.measure(View.java:8323)
   at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138)
   at android.widget.FrameLayout.onMeasure(FrameLayout.java:250)
   at android.view.View.measure(View.java:8323)
   at android.view.ViewRoot.performTraversals(ViewRoot.java:842)
   at android.view.ViewRoot.handleMessage(ViewRoot.java:1862)
   at android.os.Handler.dispatchMessage(Handler.java:99)
   at android.os.Looper.loop(Looper.java:130)
   at android.app.ActivityThread.main(ActivityThread.java:3806)
   at java.lang.reflect.Method.invokeNative(Method.java)
   at java.lang.reflect.Method.invoke(Method.java:507)
   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
   at dalvik.system.NativeStart.main(NativeStart.java)

Line at com.mathssolver.main.Logic.updateGraph(Logic.java:310) is

 MyCuteTask myTask = new MyCuteTask(equations)

if you want to execute that Async task than just write following code. `new MyCuteTask.execute();` this will execute your async task. don't create object of async task instead of that create object of your base class than try to access that async task. — Aiyaz Parmar, Nov 27 '14 at 09:55
So, you have error in Graph->Logic. You are usign here something from api 11+ — Suvitruf - Andrei Apanasik, Nov 27 '14 at 09:59
@ShaktiMalik pls, show code of Logic and Graph and copy line Logic.updateGraph(Logic.java:310) — Suvitruf - Andrei Apanasik, Nov 27 '14 at 10:00
@HareshChhelana Error comes at the line where I am instantiating this Async Task and not when i execute this. So I think it not because of that. Also I have't modified this code for long time and it was working fine so far. These errors started appearing after recent update. — Shakti Malik, Nov 27 '14 at 10:02
@Suvitruf I have already added Logic.java:310 at the end of description. — Shakti Malik, Nov 27 '14 at 10:03
i dont understand what what "k" class is... in java.lang.ClassNotFoundException: com.mathssolver.main.k. What IDE did you use for build? — Suvitruf - Andrei Apanasik, Nov 27 '14 at 10:11
Are you using proguard to obfuscate class names? `.k` looks like one. http://stackoverflow.com/questions/34413/why-am-i-getting-a-noclassdeffounderror-in-java explains the meaning of that exception, there seems to be a problem to load that class, it was probably found. I guess you don't have a device to reproduce that problem? Maybe you can see some error message at installation or run time in logcat that happen prior to this error. — zapl, Nov 27 '14 at 10:17
Yes this error is happening in release build with proguard. I will try to test my app on android 2.3.x. I will retrace and find out what is com.mathssolver.main.k — Shakti Malik, Nov 27 '14 at 10:18
Same error in google play! But most of my test 2.3.x devices is fine, so it may be a ADT build error. Please kindly let me know if you find some clues:) — thecr0w, Dec 06 '14 at 04:06
https://groups.google.com/forum/#!msg/google-admob-ads-sdk/_x12qmjWI7M/8WkalST9hvUJ — thecr0w, Dec 06 '14 at 06:38

Shakti Malik · Accepted Answer · 2014-12-08T10:11:54.090

1

Its an google play services issue. (https://code.google.com/p/android/issues/detail?id=81083)

Workaround to avoid this crash till Google fixes it:

Add following into your Application#onCreate() method

try {
  Class.forName("android.os.AsyncTask");
}
catch(Throwable ignore) {
  // ignored
}

Note its Application#onCreate() and not Activity#onCreate()

Update: I can verify that above changes fixed these crashes for me.

edited Dec 08 '14 at 10:11

answered Dec 06 '14 at 08:13

Shakti Malik

2,335
25
32

Where can I find Application#onCreate() for flutter? – S. M. Asif May 28 '22 at 10:12

score 0 · Answer 2 · answered Nov 27 '14 at 09:57

0

Asynctask was added in API level 3. Please verify one by checking the same code with API 3. If it disappears, there is your problem

answered Nov 27 '14 at 09:57

A Nice Guy

2,676
4
30
54

As I mentioned above I am seeing these errors at android 2.3.x – Shakti Malik Nov 27 '14 at 09:59

score 0 · Answer 3 · answered Nov 27 '14 at 10:04

0

This is an inner class please refer how to access the inner class object through outerclass else define your Myclass outside the Mainclass

answered Nov 27 '14 at 10:04

therealprashant

701
15
27

score 0 · Answer 4 · edited May 23 '17 at 11:46

0

I reported the same error here: Android: NoClassDefFoundError android.os.AsyncTask Because it started happening without any app delivery it looks like yet another Google Play Services bug... I'm having 83% of crashes on Android 2.3.x and 16% on crashes on 4.0.3 & 4.0.4

edited May 23 '17 at 11:46

Community

1
1

answered Nov 27 '14 at 12:00

user1026605

1,633
4
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For me, all of the crashes are on android 2.3.x. I am not sure how can it be related to GooglePlayServices because AnsycTask is not part of GooglePlayServices. – Shakti Malik Nov 27 '14 at 13:37
1

Yes I know it's part of the Android SDK, but this is the only that has changed on the user device. My app hasn't been updated, they didn't get any Android update, only the new version of the Google Play Services has just been pushed, and almost everytime it comes with some strange bug... – user1026605 Nov 27 '14 at 13:42

score 0 · Answer 5 · answered Dec 01 '14 at 17:30

0

I had the same problem and I have copied source code of the AsyncTask as MyAsyncTask into my project and extended from that class, now it works.

answered Dec 01 '14 at 17:30

user65721

2,833
3
19
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NoClassDefFoundError - Android 2.3.X

5 Answers5

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