NoClassDefFoundError for code in an Java library on Android
android, noclassdeffounderror
Solution
I had the same issue, I did the following to fix the problem.
- Go to "Properties" of the project.
- Select "Java Build Path"
- Select "Order and Export" Tab
- You should see the selected project's "src" and "gen" paths and dependencies here.
- The order how they listed were first "src" and then "gen" path
- I switch them, so that "gen" folder is build before the "src"
gen - automated code in project (from dependencies and references) src - source code in project
There was no need to restart the Eclipse. It just started working.
Honestly I have never tried "Android Tools > Fix Project Properties", sometimes it might be doing the same thing. I do not know, I just did above after seen the error message, thinking something is wrong with the build paths.
Edit
Later on it was not sufficient, I was getting the error again. Then I "checked" all the dependencies listed in that view. Now it works again. So far so good. I will keep this updated if it fails again.
FYI: in my last attempt, I tried "Android Tools > Fix Project Properties", but it didn't work out for me.
Problem
I am experiencing an error quite often among my users. The app crashes during startup. When the MainActivity is supposed to be loaded the VM apparently cannot find the class. I cannot figure out why. The architecture of the app is that there is a common project that both my free and pro version are using. Don't know if it is relevant. See the stack trace below. Any thoughts? ``` java.lang.NoClassDefFoundError: com.android.common.MainActivity at com.mycompany.myapp.Splash.onCreate(Splash.java:23) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1615) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1667) at android.app.ActivityThread.access$1500(ActivityThread.java:117) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:935) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:130) at android.app.ActivityThread.main(ActivityThread.java:3687) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:507) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:842) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600) at dalvik.system.NativeStart.main(Native Method) Caused by: java.lang.ClassNotFoundException: com.android.common.MainActivity in loader dalvik.system.PathClassLoader[/system/framework/com.google.android.maps.jar:/data/app/com.android.pro-1.apk] ``` Edit: Thanks for the comment below, Richard. Now I have changed `com.android.Splash` to something else. It wasn't the real classname anyway. My bad...!