NoClassDefFoundError - Eclipse and Android

Question

I m having a problem trying to run an Android app which  up until adding a second external library to its build path  was working fine  Since having added the scoreninja jar  I now get a NoClassDefFoundError when I try to run the app   Here s the message   02-11 21 45 26 154  ERROR AndroidRuntime 3654   java lang NoClassDefFoundError  com scoreninja adapter ScoreNinjaAdapter   As all of the build scripts are generated by the Android tools      I m not sure what else I can do other than cleaning and rebuilding or restarting eclipse  I have already tried all three   Does anyone know how I can amend this

User · Answer

I had this problem after updating ADT   I was storing all of my JAR files in a folder called  lib  and adding the jars to the build path the normal Eclipse way   This worked fine until my update   After my update  I was getting the NoClassDefFoundError for a class that I could clearly see was included in the jar  checking out the ReferencedLibraries classes    The solution was to remove my jars from the build path and rename my  lib  folder to  libs    This is an ant convention  and seems to be the way the new ADT finds and includes libraries in an  apk file  Once I did this  everything worked fine

User · Answer

I got the exact same problem     To fix it  I just removed my Android Private Libs in  build path  and clicked ok     and when i opened op the  build path  again eclipse had added them by itself again  and then it worked for me

User · Answer

Right click your project folder  look for Properties in Java build path and select the jar files that you see  It has worked for me

User · Answer

please make sure your jar file is in the libs directory of your project in you are using newer ADT version with your eclipse

User · Answer

The solution here worked for me  It s a matter of importing the library to the libs folder  then modifying the build gradle file and then cleaning with gradlew

User · Answer

If you change your order and export in your project build path  this error will not occur   The other way of achieving it is through  classpath in your project folder

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Acutally you have reached the infamous 64k limit issue  you need to enable multidex    This is how you do it   https   developer android com tools building multidex html

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John O Connor is right with the issue  The problem stays with installing ADT 17 and above  Found this link for fixing the error   http   android foxykeep com dev how-to-fix-the-classdefnotfounderror-with-adt-17

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I had this for MapActivity  Builds in Eclipse gets NoClassDefFound in debugger   Forgot to add library to manifest  inside  lt Application gt     lt  Application gt  element   lt uses-library android name  com google android maps    gt

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By adding the external jar into your build path just adds the jar to your package  but it will not be available during runtime   In order for the jar to be available at runtime  you need to    Put the jar under your assets folder  Include this copy of the jar in your build path Go to the export tab on the same popup window Check the box against the newly added jar

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As i understood  your Project shows no errors  because you included the Jar  But the Jar won t be used  when your Project got  exported  to the device   Try this  Project -  Properties  Java Build Path   Order and Export      Your Jar

User · Answer

I had this same error with ADT22  Resolved it checking  Android Private Libraries  in properties -  Java build path -  Order and export  If you are using any library projects  the same should be done for them as well

User · Answer

I didn t have to put the jar-library in assets or lib s   but only tick the box for this jar in Properties -  Java Build Path -   Order and Export   it was listed before  but not selected

User · Answer

I have changed the order of included projects  Eclipse   Configure Build Path   Order and Export   I have moved my two dependent projects to the top of the  Order and Export  list  It solved the problem  NoClassDefFoundError    It is strange for me  I didn t heard about the importance of the order of included libraries and projects  Android   Eclipse is fun

User · Answer

I had this problem and it was caused by not  exporting  the library Issue was just because the  class files for some classes are  not available while packaging the APK Compile time it will work fine with out exporiting  In my case I was using  CusrsorAdapter  class and under  JavaBuildPath- Order and Export  I didn t check the support V4 jar Once it is selected issue is gone   To make sure you are getting noClassDefFound error because of above reason  please check your logacat  you will see unknown super classs error at run time

User · Answer

I tried various things and the reason for error in my case was conflict between maps jar and Google Api in Java Build Path-  Libraries  So  when i removed the maps jar it worked fine    Regards   wahib

User · Answer

Try this -  Step 1  Add all the libraries to build pat in Eclipse  means make all libraries referenced libraries   Step 2  Delete R java file and again build the project  Don t worry  R java will automatically get recreated   Chill

User · Answer

If you prefer to know which files the workaround is related to here s what I found  Simple change the  classpath file to   lt  xml version  1 0  encoding  UTF-8   gt   lt classpath gt       lt classpathentry kind  src  path  src   gt       lt classpathentry kind  src  path  gen   gt       lt classpathentry exported  true  kind  con  path  com android ide eclipse adt ANDROID FRAMEWORK   gt       lt classpathentry exported  true  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  output  path  bin classes   gt   lt  classpath gt    Replace the  classpath file in all library projects and in main android project  The  classpath file is in the root folder of the eclipse project  Of cause don t forget to add your own classpath entries  should you have any  so compare with your current version of  classpath    I believe this is the same result as going through the eclipse menus as componavt-user explained above  Eclipse   Configure Build Path   Order and Export

User · Answer

I tried everything from this post  and some other posts   and it didn t worked for me  this is by far the most terrible ADT upgrade I have experienced  and I will never upgrade without a working ADT backup   I managed to solve it by removing the project  and then adding it again using a source backup I had

User · Answer

Same thing worked for me  Properties -  Java Build Path -   Order and Export  Interestingly - why this is not done automatically   I guess some setting is missing  Also this happened for me after SDK upgrade

User · Answer

This happens quite very often to me   Last time that happened I can remembered was caused by switching the Eclipse ADT  Google special edition  to Android Studio  and switching back  I basically tried all methods that I can found on stackoverflow which didn t work for me   Eventually  I got the app working again  no more NoCalssDeffoundError  by switching my IDE to original Eclipse  Kepler  with ADT

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All the existing answers don t work for me because my case is a little bit different  It took me a few hours to get it to work  I m using Eclipse   My android project includes another normal java 1 6 project  which needs a 3rd party jar file  The trick is    include the jar in the normal java project for it to compile  only   don t check it in the  Order and Export  tab also copy this jar file into the  libs  folder of the android project so it ll be available in runtime   Hope this help those who have similar scenarios like mine

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sometimes you have to take the whole external project as library and not only the jar   my problem solved by adding the whole project  in my case google-play-services lib  as library and not only the jar  the steps to to it  from  style answer     File- New- Other Select Android Project Select  Create Project from existing source  Click  Browse     button and navigate to the wanted project Finish  Now action bar project in your workspace  Right-click on your project -  Properties In Android- Library section click Add select recently added project -  Ok

User · Answer

Sometimes it will happen due to not including jar  which you have dependency  with  uses-libary   tag in your AndroidManifest xml   Also  make sure it should be inside  application  tag   Regards   Ravi

User · Answer

I m not sure if this is related  or if you re even still looking for an answer  but I came across this thread while trying to research the same error  but possibly for different reasons    I couldn t find any solutions online  but an answer on a similar thread got me thinking and realized I probably just needed to rebuild  or clean  the project   In Eclipse  go to Project    Clean  Select your project and Eclipse seemed to fix it itself  For me this solved the problem   Hope this helps

User · Answer

i spent two days trying to solve this issue after updating ADT  finally i was lucky to get this post here    https   code google com p android issues detail id 55304   which led me in the right direction  when you follow the solution - remember to replace the android support library of all your projects to the same version  remove it and re-install it to the projects   i hope this helps - good luck

User · Answer

I have encountered the same issue  The reason was that the library that I was trying to use had been compiled with a standard JDK 7   I recompiled it with the -source 1 6 -target 1 6 options and it worked fine

[java] NoClassDefFoundError - Eclipse and Android

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