java.lang.ClassNotFoundException on working app

Question

I have created and published my first android app. It's very simple. It works fine on simulator and some phones, but I am getting this error:

java.lang.RuntimeException: Unable to instantiate application cz.teamnovak.droid.Novak ESC Track guide: java.lang.ClassNotFoundException: cz.teamnovak.droid.Novak ESC Track guide in loader dalvik.system.PathClassLoader[/data/app/cz.teamnovak.droid-1.apk]
    at android.app.ActivityThread$PackageInfo.makeApplication(ActivityThread.java:649)
    at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4232)
    at android.app.ActivityThread.access$3000(ActivityThread.java:125)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2071)
    at android.os.Handler.dispatchMessage(Handler.java:99)
    at android.os.Looper.loop(Looper.java:123)
    at android.app.ActivityThread.main(ActivityThread.java:4627)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:521)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
    at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.ClassNotFoundException: cz.teamnovak.droid.Novak ESC Track guide in loader dalvik.system.PathClassLoader[/data/app/cz.teamnovak.droid-1.apk]
    at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:243)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:573)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:532)
    at android.app.Instrumentation.newApplication(Instrumentation.java:942)
    at android.app.ActivityThread$PackageInfo.makeApplication(ActivityThread.java:644)
    ... 11 more

Any idea what can cause this?

Answer 1

Well you have a java.lang.ClassNotFoundException. That means a class is missing in the application runtime. You should check wheather you have added all your libs to the build path.

Right click on your project -> properties -> java build path -> libraries, add your libs or create one containing your classes and enable order export for your libs.

Answer 2

Hello

well, I have exported by eclipse and I dont see any classes or jars inside. och, it does not work this export.... I have to find out why

Thank you, Skoky.

Answer 3

Well, there is file classes.dex. It should contain compiled code. Right? The file is there. So why do I get ClassNotFoundException?

Skoky.

Answer 4

Hello,

one more cosideration. The error says "java.lang.ClassNotFoundException: cz.teamnovak.droid.Novak ESC Track guide" -> the problem is I dont have such a class. Its somehow mixed up. The "Novak ESC Track guide" is name of the application.

Pleas advice whats going on.

Thank you, Skoky.