java lang ClassNotFoundException Didn t find class on path dexpathlist

Question

I m currently working on a project in which I have to use purely native ndk  It worked when I try running an helloworld example from Irrlicht engine source  Then I try using it in my project following the same format of that example  But I got   03-14 01 40 05 308  E AndroidRuntime 799   java lang RuntimeException  Unable to instantiate activity ComponentInfo com irrlicht example1 android app POMActivity   java lang ClassNotFoundException  Didn t find class  android app POMActivity  on path  DexPathList  zip file   data app com irrlicht example1-2 apk   nativeLibraryDirectories   data app-lib com irrlicht example1-2   system lib     while running my project   Here is my main cpp file    include  lt android log h gt   include  lt jni h gt   include  lt android native app glue h gt   include  android tools h   ifdef  IRR ANDROID PLATFORM  void android main android app  app      android log print 4    pom     nothing         endif  in Android mk    LOCAL PATH      call my-dir     IRRLICHT PROJECT PATH      LOCAL PATH  include   CLEAR VARS  LOCAL MODULE    Irrlicht LOCAL SRC FILES     home karthik Android Essentials ogl-es lib Android libIrrlicht a include   PREBUILT STATIC LIBRARY  include   CLEAR VARS  LOCAL MODULE    HelloWorldMobile1 LOCAL CFLAGS    -D IRR ANDROID PLATFORM  -pipe -fno-exceptions -fno-rtti -fstrict-aliasing LOCAL C INCLUDES    -I       include -I  home karthik Android Essentials ogl-es include -I  home karthik Android json jsoncpp-src-0 5 0 libs linux-gcc-4 8 -I  home karthik Android json jsoncpp-src-0 5 0 include json  LOCAL SRC FILES     android tools cpp main cpp LOCAL LDLIBS    -lEGL -llog -lGLESv1 CM -lGLESv2 -lz -landroid -ldl  LOCAL STATIC LIBRARIES    Irrlicht android native app glue include   BUILD SHARED LIBRARY    call import-module android native app glue    And I have given Activity name in AndroidManifest xml    lt manifest xmlns android  http   schemas android com apk res android      package  com irrlicht example1      android versionCode  1      android versionName  1 0  gt       lt application android icon   drawable irr icon  android label  HelloWorldMobile1  android theme   android style Theme NoTitleBar Fullscreen  android debuggable  true  gt           lt activity android name  android app POMActivity          android label  HelloWorldMobile1          android launchMode  singleTask          android configChanges  orientation keyboardHidden          android screenOrientation  portrait          android clearTaskOnLaunch  true  gt           lt meta-data android name  android app lib name  android value  HelloWorldMobile1    gt                         What is the mistake I am doing here  I ll post full code if necassary

User · Answer

This exception can also occur when you have a custom view in your layout like this:

<com.example.MyView
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

and you change the view's package name from "com.example" to something different, but you forget to change it in the layout as well.

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I tried all possible options but result is zero  Finally i found correct solution which is helpful for me  Just go to disable Instant Run Go to File -  Settings -  Build Execution  Deployment -  Instant Run -  Uncheck the checkbox for instant run  Run your app once and this apk file work properly

User · Answer

If you receive this error after removing some gradle dependency  check your manifest and make sure that you removed all entries corresponding that dependency

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I was getting this crash only on Samsung Lollipop devices and this solution worked for me   dexOptions        preDexLibraries false     I m posting this answer here because this question is currently the highest ranked search result on Google for this crash and none of the above answers worked for me

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In my case this issue arose because of Kotlin  In my existing code there was a class that was written Kotlin  I built the app  it installed and as soon as first activity opened app crashed  in the logcat this error was being shown  I then updated my Kotlin version from Kotlin website in app gradle file  Build the app again and it worked fine then

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This solved my case   In my case  I was getting the exception below  note that my application class was causing the exception  not my activity    ClassNotFoundException  Didn t find class  com example MyApplication  on path  DexPathList   I was getting this exception only on devices equal or below API 19  the reason was that I was extending MultiDexApplication   class and overriding attachBaseContext at the same time  When I removed attachBaseContext everything got on track   class MyApplication   MultiDexApplication      override fun onCreate         super onCreate                 override fun attachBaseContext base  Context         super attachBaseContext base      MultiDex install this      So if you happen to have such case as I had  Which isn t likely   there is no need to extend MultiDexApplication   and override attachBaseContext at the same time  doing one of these actions is enough

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I faced this Issue multiple times and they re all solved by disabling Instant Run

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The following solution worked for me     I tried everything mentioned above but still didn t get my app running  I have react-native app running on latest version of gradle 4  and android studio   I had the issue where if i run react-native run-android it was failing with issue saying its not able to find MainApplication class   i e ClassNotFoundException  I was able to resolve the issue when I updated my gradle properties to use the compiler D8   I added   android enableD8 true  to my gradle properties  Doc Details here  https   android-developers googleblog com 2017 08 next-generation-dex-compiler-now-in html

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For me what i ended up doing is disabling minifyEnabled  false and shrinkResources  false

User · Answer

This seems to be problem in your case  The relative path of your activity in manifest is not correct    lt activity android name  android app POMActivity    replace this with     lt activity android name   POMActivity    or   lt activity android name  com irrlicht example1 POMActivity

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If you are enabled minifyEnabled and shrinkResources to true in your app gradle file  You need to add the following line in proguard-rules pro file     -keep class com yourpackage name             because minification is removed some important classes in our apk file

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I am going with  hofs but displaying where should put minifyEnabled  In Module Gradle  Add minifyEnabled false in Debug block will work for me   android       compileSdkVersion 28     buildToolsVersion  quot 29 0 2 quot      defaultConfig           applicationId  quot com korechi roamioapp quot          minSdkVersion 23         targetSdkVersion 28         versionCode 1         versionName  quot 1 0 quot          testInstrumentationRunner  quot androidx test runner AndroidJUnitRunner quot          multiDexEnabled true           buildTypes           release               minifyEnabled true             proguardFiles getDefaultProguardFile  proguard-android-optimize txt     proguard-rules pro                    debug             minifyEnabled false

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for anyone who comes across this problem now  with android studio 4 0  you just have to enable java 8 as mentioned here android       defaultConfig                             compileOptions           sourceCompatibility JavaVersion VERSION 1 8         targetCompatibility JavaVersion VERSION 1 8

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We don t need to have customized Application class which extends MultiDexApplication  Instead  we can have like this on AndroidManifest xml   lt application android name  android support multidex MultiDexApplication  android hardwareAccelerated  true  android icon   mipmap ic launcher  android label   string app name  android supportsRtl  true  android theme   style AppTheme  gt    And along with this on build gradle Module app    defaultConfig                       Enabling multidex support        multiDexEnabled true    dependencies                  compile  com android support multidex 1 0 2      Thanks

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I had a similar problem  here s my solution    Right click on your project and select Properties  Select Java Build Path from the menu on the left  Select the Order and Export tab  From the list make sure the libraries or external jars you added to your project are checked  Finally  clean your project  amp  run    You may also check this answer

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This was similar to my problem--after adding a Kotlin file to an all Java app  my app kept crashing when I would access a view that used a Kotlin file  I shut down Android Studio and restarted it  and it prompted me with a message saying  Kotlin not configured  would you like to configure    which then solved my problem   What this ultimately did is add the following classpath line inside my project build gradle file   buildscript             dependencies                   classpath  org jetbrains kotlin kotlin-gradle-plugin  kotlin version

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i solved it by using    gradlew --stop command in android studio terminal  After perform this command then clean and rebuild project

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As per my understading i get the issue after update android studio 2 1 to 2 3 due to the instant feature my application will not run when i copy the apk from output and put into the sdcard  For this problem i build the apk from build option do build apk in android studio

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In my case  I used the old namespace library while my project was set up making use of androidx one    The solution was to replace android support design widget BottomNavigationView component with the right one to escape from support library  com google android material bottomnavigation BottomNavigationView

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If the project was compiling just before  you can try to clear the cache using       gradlew clean  or     gradlew cleanBuildCache  or for windows   gradlew cleanBuildCache  https   developer android com studio build build-cache html

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I had the same error and some answers mislead me on a newbie issue  I had the wrong package in my custom view descriptor like below  I hope it helps somebody    lt com my app wrong package MyActivity     android id    id myActivity      android layout width  match parent      android layout height  wrap content      android layout marginLeft  16dp      android layout marginRight  16dp      android paddingTop  16dp      android paddingBottom  8dp      android gravity  left    gt

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after i tried the given answers  i found out another reason for the same Exception  that i had to add the library i m using manually to my main library through  Right click on my main library  gt   Properties  gt   Android  gt   Go to the very bottom of the screen and click  Add   gt   Select my other library that caused the crash  gt  Apply   before this solution  i used the  Fix Project setup  from within the  java file in eclipse  but this did not work  so i had to add it manually here and it worked

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I should understand the problem by just seeing      dex errors   But it took a half day to fix the issue  I fix this by following android developers page s instruction  https   developer android com studio build multidex html  First add this to gradle build file    defaultConfig               minSdkVersion 14     targetSdkVersion 21                 Enabling multidex support      multiDexEnabled true     dependencies        compile  com android support multidex 1 0 0       Then extend Application class with the MultiDexApplication class as instructed on the above link  or declare the application class in AndroidManifest xml or override attachBaseContext   function if not possible to extend the application class    That s all and it solved the problem

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I was facing same issue  I tried everything possible for a day  but nothing worked  The dependency which was causing problem was using lower compile sdk  target sdk and min sdk  I created library module for the project  copied all the sources and matched the sdk versions with application sdk versions  And finally it worked like a charm

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Ashik abbas answer  disable Instant Run  work for me  but i need Instant Run  finally i found solution which is helpful for me  just disable minifyEnabled  go to build gradle Module  app  in debug block and disable minifyEnabled   debug               minifyEnabled false

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For any one who is having multidex enable write this  inside build gradle  apply plugin   com android application   android    defaultConfig         multiDexEnabled true      dexOptions           javaMaxHeapSize  4g           dependencies       compile  com android support appcompat-v7        compile  com google android gms play-services        compile  com android support multidex 1 0 1      write a class EnableMultiDex like below  import android content Context  import android support multidex MultiDexApplication   public class EnableMultiDex extends MultiDexApplication       private static EnableMultiDex enableMultiDex      public static Context context       public EnableMultiDex            enableMultiDex this             public static EnableMultiDex getEnableMultiDexApp             return enableMultiDex              Override     public void onCreate             super onCreate            context   getApplicationContext               and in AndroidManifest xml write this className inside Application tag    lt application     android name  YourPakageName EnableMultiDex      android hardwareAccelerated  true      android icon   drawable wowio launch logo      android label   string app name      android largeHeap  true      tools node  replace  gt

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Flipper isn t working on 0 61 x  so commenting out removing initializeFlipper this  in your MainApplication java should do the trick  Chill Pill

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i had this issue before and the comments here helped in the past but this time it did not  i checked my proguard configuration and i removed the following lines and then it worked so proguard can have something to do with this error    -optimizationpasses 5         -overloadaggressively         -repackageclasses            -allowaccessmodification         -dontskipnonpubliclibraryclassmembers

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When you are using multidex   then try to extend your application class with MultiDexAppication instead of Application and override below method this required for Android below 5 0  because 5 0 and above support to the multidex    Override protected void attachBaseContext Context base        super attachBaseContext base       MultiDex install BaseApplication this       and in dependencies add this  compile  com android support multidex 1 0 1

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delete the bin folder   change the order of librarys   clean and rebuild     worked for me

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delete  android app  settings  folder or delete  android  settings  folder or delete  android  build  folder or delete  android  idea  folder and yarn react-native run android

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Just Change your folder name from lib to libs    Then you will see some error marks in your project  to resolve this rightClick on project    Properties  gt  Java Build Path  gt  libraries    Remove all the library with red marks on it  then apply  gt  ok  gt  after that  clean your project   TADA see the magic

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Just try Clean Project  amp  Rebuild Project

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One possible reason would be the incorrect path of the activity in the Apps AndroidManifest xml file  Register the activity with in your AndroidManifest xml with full relative path like below    lt activity android name   lt full path gt  ActivityName    gt

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in my case  I define the Activity in Manifest xml and forgot to create any activity  So I created Activity and define it in manifest and my error solved

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For me the issue appeared after i created a signed APK  To fix it  i generated a new  debug apk using Run   Build APK  After that  Run cmd r  works again without this error

User · Answer

The deletion of app on device and cleaning of project works for me

[java] java.lang.ClassNotFoundException: Didn't find class on path: dexpathlist

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