Android ClassNotFoundException: Didn't find class on path

Question

10-22 15:29:40.897: E/AndroidRuntime(2561): FATAL EXCEPTION: main 10-22 15:29:40.897: E/AndroidRuntime(2561): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.gvg.simid/com.gvg.simid.Login}: java.lang.ClassNotFoundException: Didn't find class "com.gvg.simid.Login" on path: DexPathList[[zip file "/data/app/com.gvg.simid-1.apk"],nativeLibraryDirectories=[/data/app-lib/com.gvg.simid-1, /vendor/lib, /system/lib]] 10-22 15:29:40.897: E/AndroidRuntime(2561):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2137) 10-22 15:29:40.897: E/AndroidRuntime(2561):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261) 10-22 15:29:40.897: E/AndroidRuntime(2561):     at android.app.ActivityThread.access$600(ActivityThread.java:141) 10-22 15:29:40.897: E/AndroidRuntime(2561):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256) 10-22 15:29:40.897: E/AndroidRuntime(2561):     at android.os.Handler.dispatchMessage(Handler.java:99) 10-22 15:29:40.897: E/AndroidRuntime(2561):     at android.os.Looper.loop(Looper.java:137) 10-22 15:29:40.897: E/AndroidRuntime(2561):     at android.app.ActivityThread.main(ActivityThread.java:5103) 10-22 15:29:40.897: E/AndroidRuntime(2561):     at java.lang.reflect.Method.invokeNative(Native Method) 10-22 15:29:40.897: E/AndroidRuntime(2561):     at java.lang.reflect.Method.invoke(Method.java:525) 10-22 15:29:40.897: E/AndroidRuntime(2561):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737) 10-22 15:29:40.897: E/AndroidRuntime(2561):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 10-22 15:29:40.897: E/AndroidRuntime(2561):     at dalvik.system.NativeStart.main(Native Method) 10-22 15:29:40.897: E/AndroidRuntime(2561): Caused by: java.lang.ClassNotFoundException: Didn't find class "com.gvg.simid.Login" on path: DexPathList[[zip file "/data/app/com.gvg.simid-1.apk"],nativeLibraryDirectories=[/data/app-lib/com.gvg.simid-1, /vendor/lib, /system/lib]] 10-22 15:29:40.897: E/AndroidRuntime(2561):     at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:53) 10-22 15:29:40.897: E/AndroidRuntime(2561):     at java.lang.ClassLoader.loadClass(ClassLoader.java:501) 10-22 15:29:40.897: E/AndroidRuntime(2561):     at java.lang.ClassLoader.loadClass(ClassLoader.java:461) 10-22 15:29:40.897: E/AndroidRuntime(2561):     at android.app.Instrumentation.newActivity(Instrumentation.java:1061) 10-22 15:29:40.897: E/AndroidRuntime(2561):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2128) 10-22 15:29:40.897: E/AndroidRuntime(2561):     ... 11 more 

I'm not really sure what is causing it as it is correctly listed in the manifest:

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android"     package="com.gvg.simid"     android:versionCode="1"     android:versionName="1.0" >      <uses-sdk         android:minSdkVersion="8"         android:targetSdkVersion="18" />      <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />     <uses-permission android:name="android.permission.BLUETOOTH" />     <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />     <uses-permission android:name="android.permission.CAMERA"/>     <uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.READ_LOGS" />     <uses-permission android:name="android.permission.READ_OWNER_DATA" />     <uses-permission android:name="android.permission.READ_PHONE_STATE" />     <uses-permission android:name="android.permission.RECORD_AUDIO"/>     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />     <uses-permission android:name="android.permission.WRITE_OWNER_DATA" />     <uses-permission android:name="android.permission.WRITE_SETTINGS" />     <uses-permission android:name="android.permission.WAKE_LOCK" />      <uses-feature android:name="android.hardware.usb.host" />      <application         android:allowBackup="true"         android:icon="@drawable/ic_launcher"         android:label="@string/app_name"         android:theme="@style/AppTheme" >         <activity             android:name="com.gvg.simid.Login"             android:label="@string/app_name"              android:screenOrientation="landscape">             <intent-filter>                 <action android:name="android.intent.action.MAIN" />                  <category android:name="android.intent.category.LAUNCHER" />             </intent-filter>         </activity>     </application>  </manifest> 

I also added "Android Private Libraries" to build path, and moved it to the top of "Order and Export", but it still gave me the same error.

EDIT: I rebuilt the project completely, and was unable to reproduce the error. Not sure what was causing it.

Answer 1

I had the same issue for my project. It happened due to the conflict in android support library version between my project and the library project that I added in my project. Put the same version android support library in your project and library projects you included and clean build... Everything will work...

Answer 2

This following method worked for me

• Right click on your project and select properties
• The "Properties for " panel will open. From the menu on the left go to Java Build Path -> Order and Export
• From the list below uncheck the box next to "Android Dependencies"
• Finally clean your project and run