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)

Answer 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.

Answer 2

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.

Answer 3

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

Answer 4

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

Answer 5

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