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    lt  xml version  1 0  encoding  utf-8   gt   lt manifest xmlns android  http   schemas android com apk res android      package  com gvg simid      android versionCode  1      android versionName  1 0   gt        lt uses-sdk         android minSdkVersion  8          android targetSdkVersion  18    gt        lt uses-permission android name  android permission ACCESS WIFI STATE    gt       lt uses-permission android name  android permission ACCESS NETWORK STATE    gt       lt uses-permission android name  android permission BLUETOOTH    gt       lt uses-permission android name  android permission BLUETOOTH ADMIN    gt       lt uses-permission android name  android permission CAMERA   gt       lt uses-permission android name  android permission CHANGE WIFI STATE   gt       lt uses-permission android name  android permission INTERNET    gt       lt uses-permission android name  android permission READ LOGS    gt       lt uses-permission android name  android permission READ OWNER DATA    gt       lt uses-permission android name  android permission READ PHONE STATE    gt       lt uses-permission android name  android permission RECORD AUDIO   gt       lt uses-permission android name  android permission WRITE EXTERNAL STORAGE    gt       lt uses-permission android name  android permission WRITE OWNER DATA    gt       lt uses-permission android name  android permission WRITE SETTINGS    gt       lt uses-permission android name  android permission WAKE LOCK    gt        lt uses-feature android name  android hardware usb host    gt        lt application         android allowBackup  true          android icon   drawable ic launcher          android label   string app name          android theme   style AppTheme   gt           lt activity             android name  com gvg simid Login              android label   string app name               android screenOrientation  landscape  gt               lt intent-filter gt                   lt action android name  android intent action MAIN    gt                    lt category android name  android intent category LAUNCHER    gt               lt  intent-filter gt           lt  activity gt       lt  application gt    lt  manifest gt    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

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In our case we wanted to compile Vagrant version and had same error  We fixed it by clean project and rebuild project in Build menu

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I faced the same problem and solved it by doing the following   From the build menu select  1- clean Project   2- Build APK

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I had this issue  raised by several causes  but i see this in your stacktrace    Unable to instantiate activity ComponentInfo       java lang ClassNotFoundException  Didn t find class       on path  DexPathList        I found a diference in my  classpath before it stop working     lt  xml version  1 0  encoding  UTF-8   gt   lt classpath gt       lt classpathentry kind  src  path  src   gt       lt classpathentry kind  con  path  com android ide eclipse adt ANDROID FRAMEWORK   gt       lt classpathentry kind  con  path  com android ide eclipse adt LIBRARIES   gt       lt classpathentry kind  src  path  gen   gt       lt classpathentry kind  output  path  bin classes   gt   lt  classpath gt    I ve ADDED the line     lt classpathentry exported  true  kind  con  path  com android ide eclipse adt DEPENDENCIES   gt    this is the final version      lt  xml version  1 0  encoding  UTF-8   gt   lt classpath gt       lt classpathentry kind  src  path  src   gt       lt classpathentry kind  con  path  com android ide eclipse adt ANDROID FRAMEWORK   gt       lt classpathentry kind  con  path  com android ide eclipse adt LIBRARIES   gt       lt classpathentry exported  true  kind  con  path  com android ide eclipse adt DEPENDENCIES   gt       lt classpathentry kind  src  path  gen   gt       lt classpathentry kind  output  path  bin classes   gt   lt  classpath gt    Now it works

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I had this problem several times and often I didn t do something obviously wrong with dependencies    It s always a good idea to check if this  not found  class is present in the final apk  If it is  like it happened in my cases  the problem usually is   It s not that given class is not found  but it cannot be loaded because its super class is missing    Check if class that you extend is available and then try to fix your build script or dependencies accordingly

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I had this issue recently and I am using Android Studio 0 8 4  The problem was the fact that I decided to rename an XML menu layout file that was called main xml   Right click on it and chose Refactor --  Rename  Before renaming it  be sure uncheck  Search in comments and strings  and pressed Refactor    Because my file was originally named  main   it renamed critical paths in the app iml and build gradle  mainly the java srcDirs in the build gradle  since the path is defined as  src main java    I hope this helps anyone that may be experiencing this issue

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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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Solution mentioned here --  Multidex Issue solution worked for me  Below is what needs to be added to Application context     Override protected void attachBaseContext Context base        super attachBaseContext base       MultiDex install this

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In my case it was proguard minification process that removed some important classes from my production apk   The solution was to edit the proguard-rules pro file and add the following   -keep class com someimportant3rdpartypackage

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Believe me or not    I tried out almost each answer I had found here on stackoverflow  Nothing would help  until I just restarted the machine  My Android Studio works on Ubuntu 16 04 LTS

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I had same issue  this worked for me   1  Full path of activity in mainfest in place of relative path   2  Delete  build  folder and clean project

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I just restarted the device and ran the app  It worked without any issues  Hope this helps someone

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If you get this error while using the new Instant Run feature in Android Studio 2 0 and above then this is some kind of bug on their side    To fix this you will have to stop your app manually on Device Emulator if it s not stopped then from Android Studio select Build Rebuild Project   Then click the Run button or SHIFT F10

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I face the same problem   and after a lot of work and search   I figured out the solution   I just cleaned the project  then  build the apk  -Build- Clean Project -Build-  Build APK s  I hope it is useful

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I met the same problem and I noticed the sample code was put under directory  java  instead of directory  src   After moving the code to src  the problem was solved   Also make sure the app directory is split into multiple folders  e g   main com site appname  not  main com site appname   Hope it works

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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

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I found this error in Android Studio when i tried do debug in a device with API 23  so i checked the Android Studio and i noticed that i didnt had instaled this API 23 version  After install  i solved the problem

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Just in case anybody faces the same problem as me and no suggest answer here helps   For me the cause was  that the Android studio refactor is buggy  I moved an innerclass outside of a class  which was a View and therefore also had a xml  where the direct path was set  This path will not get refactored by studio  And no error will be thrown    Hope this helps anybody  Cheers

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I faced this problem when I tried to build and install my app to a Android 8 1 0  API 26 phone   The only reason is that I added android hasCode  false  to the application tag in the manifest file  However  it worked on API 24 with the same code when I tried several months ago  STRANGE      After removing that attribute  the problem disappears

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I had the same exact issue  As  weiweia suggested  move the code from the java directory to src worked for me  I also removed the Android Dependencies from Project --  Properties --  Java Build Path --  Order and Export  and made sure only to include Library Projects in the Android screen

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I had this problem after upgrading from version 18  After the upgrade I had the following  Project Build Target was 5 01  targetSDKVersion 21  But  Build Tools were still from Android 4 3 1  18   What I noticed was that those apps that were deriving their activities from ActionBarActivity crashed with the above error those that did not still ran   So the simple fix was to use the latest Android SDK Build Tools 21 1 2 instead of only those of Android SDK Build Tools 18  which seems somehow the default   So the culprit seems the Appcompat library  which I use for Actionbar backward compability   And a by the way  using the appcompat library I had to set fix    SDKInstallDIR  Android android-sdk extras android support v7 appcompat project properties target android-21  which was recommended in some other useful post and which has a value of 19 by default

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I had this issue in IntelliJ IDEA  This is how I solved it   Project Properties   Facets   Click the Android Facet created from the external library you are adding   Check the box  Library Module

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1  Create libs folder under project root  2  Copy and paste the jar file into it 3  Configure the build path  Add jar  4  Clean and run  cheers  -

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java lang RuntimeException  Unable to instantiate application com android tools fd runtime BootstrapApplication  java lang ClassNotFoundException  Didn t find class  com android tools fd runtime BootstrapApplication  on path   data app apk in android 4 3  4 1   Unable to instantiate application com android tools fd runtime BootstrapApplication  java lang ClassNotFoundException  com android tools fd runtime BootstrapApplication in below lollipop iam facing like this error   To disable Instant Run  it will work fine follow the below steps to disable instant run in android studio  1  Go to File  Settings--  Build Execution Deployment -- Instant Run ---  uncheck  Enable instant run

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I also faced the same problem  we can solve this by doing some thing like  1- Uninstall the app   2- Rebuild the project   3- Clean the project   4- Invalidate and restart the project from file -  invalidate and restart

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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

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If you are using Eclipse try Project -  Clean

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I faced this error once when I defined a class that extended a view but referred to this custom view in the layout file with the wrong name  Instead of  lt com example customview  gt   I had included  lt com customview  gt  in the XML layout file

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If you are using Multidex on Android 4 4 and prior  your issue might be that your activity class is located in the second dex file and therefore not found by the android system   To keep your activity class in the main dex file  see this page   https   developer android com studio build multidex html keep    To find which classes are located in a dex file use Android Studio   Simply drag n drop your apk into Android Studio  You should be able to see your dex files in the apk explorer   Then select the dex file to see what classes are inside     another alternative is dexdump   You can check the content of your dex files contained in your apk by using the command dexdump which can be found in     android-sdk build-tools 27 0 3 dexdump   For windows users see this tool I made to ease the process

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If you added a new Library Project as a module to your Android project and you re using Kotlin in your library do not forget to add   apply plugin   kotlin-android    to top of your module s Gradle file  Android Studio does not add this line when you created a new module and this may waste your hours like me   Edit  After a while  I just struggled with this problem again and this time I forgot to add my module as a dependency on the project

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I had the same issue  I am using Xamarin Android   The problem in my case was that I changed the versionCode and versionName   I had no problem when I had them set like this    lt  xml version  1 0  encoding  utf-8   gt   lt manifest xmlns android  http   schemas android com apk res android  package  pac ka ge  android versionCode  1  android versionName  1 0  android installLocation  auto  gt    The issue appeared when I changed it to this  versionCode 2 and versionName 0 0 1     lt  xml version  1 0  encoding  utf-8   gt   lt manifest xmlns android  http   schemas android com apk res android  package   pac ka ge   android versionCode  2  android versionName  0 0 1  android installLocation  auto  gt    I fixed the issue by changing to versionCode 2 and versionName 1 0 0 1  like so    lt  xml version  1 0  encoding  utf-8   gt   lt manifest xmlns android  http   schemas android com apk res android  package   pac ka ge   android versionCode  2  android versionName  1 0 0 1  android installLocation  auto  gt    I am unsure why this was a problem  maybe Android doesn t like a lower versionName with a higher versionCode   I found the following on http   developer android com guide topics manifest manifest-element html vname     android versionCode   An internal version number  This number is used only to determine whether one version is more recent than another  with higher numbers indicating more recent versions  This is not the version number shown to users  that number is set by the versionName attribute    The value must be set as an integer  such as  100   You can define it however you want  as long as each successive version has a higher number  For example  it could be a build number  Or you could translate a version number in  x y  format to an integer by encoding the  x  and  y  separately in the lower and upper 16 bits  Or you could simply increase the number by one each time a new version is released       android versionName   The version number shown to users  This attribute can be set as a raw string or as a reference to a string resource  The string has no other purpose than to be displayed to users  The versionCode attribute holds the significant version number used internally

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I had this problem for quite a while  and like everybody else the answers above didn t apply to my project    In my project I had linked up a project to my project and it was throwing ClassDefNotFoundError every time some code for the other project was executed    So this was my solution  I went to project properties of my project and Java Build Path  Pressed the  Source -tab and  link source  from src-folder of the other project to my own project and named a new folder  core-src     Hopes this solution helps someone

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I had a similar problem for Android 4 Phone  but worked for versions above this  I had added  quot multidexEnabled true quot  line to gradle script due to some reasons before  And now I deleted this line and it worked for both versions  Android 4 and above   But I didn t understand why I added that line and how it works now

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For those of you who are having this issue on Android Studio  I had the same problem after a merge and for some reason it even persisted after clean and invalidate cash restart operations which was driving me crazy   Turns out  it can be fixed by running gradle build once from command line  Simply run the following n the project directory     gradlew assemble clean   gradlew assemble   I hope it d save someone the time waste and frustration I had to go through

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This happens if we change Build Path of the APP  this can be in any case of Adding or Removing or Changing Libraries or  jar file  The Best solution is to Restart the Eclipse

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I had the same issue on Windows  I had renamed the path to the project to something containing a space    Make sure the path to your project does not contain a space

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I ran into the same issue  I solved it by first deleting the build folder in your android project folder and the build folder in your app folder  then clean your project and build

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I was having the same issue today  And tried all the above solutions already given but nothing worked for me  Then I spent sometime and I found out the reason  I thought it could save some other developers time I am sharing here as well  The problem was with wrong package name  I was using MVP architecture  and I kept my activities in view package  And I copied the Main class from my other project  This was the catch  In the xml  Main Activity was referring to different Package that was just outer side  The package was not including my view directory  MVP hierarchy level   Then I checked back in manifest as well  The same problem I found there as well  So I provided full path package name  of my activity untill MVP  view directory package there I kept my all activities   This solved my problem  Hope that helps others as well

[java] Android ClassNotFoundException: Didn't find class on path

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