Gson NoClassDefFoundError after ADT and SDK Tools update to v17

Question

Today I updated my ADT and SDK Tools to v17 and my projects using Google's gson jar library started to throw NoClassDefFoundError. Here's the logcat output:

> 03-22 12:30:58.941: E/AndroidRuntime(21672): FATAL EXCEPTION: main
> 03-22 12:30:58.941: E/AndroidRuntime(21672):
> java.lang.NoClassDefFoundError: com.google.gson.Gson 03-22
> 12:30:58.941: E/AndroidRuntime(21672):    at
> com.matriksdata.conn.XRequestHandler.connect(XRequestHandler.java:35)
> 03-22 12:30:58.941: E/AndroidRuntime(21672):    at
> com.matriksdata.conn.XRequestHandler.makeRequest(XRequestHandler.java:
> 29) 03-22 12:30:58.941: E/AndroidRuntime(21672):    at
> com.matriksdata.bavul.XBaseWithConnectionActivity.makeRequest(XBaseWithConnectionActivity.java:
> 46) 03-22 12:30:58.941: E/AndroidRuntime(21672):    at
> com.matriksdata.ui.login.SplashScreenActivity.onCreate(SplashScreenActivity.java:
> 36) 03-22 12:30:58.941: E/AndroidRuntime(21672):    at
> android.app.Activity.performCreate(Activity.java:4465) 03-22
> 12:30:58.941: E/AndroidRuntime(21672):    at
> android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:
> 1049) 03-22 12:30:58.941: E/AndroidRuntime(21672):    at
> android.app.ActivityThread.performLaunchActivity(ActivityThread.java:
> 1919) 03-22 12:30:58.941: E/AndroidRuntime(21672):    at
> android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:
> 1980) 03-22 12:30:58.941: E/AndroidRuntime(21672):    at
> android.app.ActivityThread.access$600(ActivityThread.java:122) 03-22
> 12:30:58.941: E/AndroidRuntime(21672):    at
> android.app.ActivityThread$H.handleMessage(ActivityThread.java:1146)
> 03-22 12:30:58.941: E/AndroidRuntime(21672):    at
> android.os.Handler.dispatchMessage(Handler.java:99) 03-22
> 12:30:58.941: E/AndroidRuntime(21672):    at
> android.os.Looper.loop(Looper.java:137) 03-22 12:30:58.941:
> E/AndroidRuntime(21672):    at
> android.app.ActivityThread.main(ActivityThread.java:4340) 03-22
> 12:30:58.941: E/AndroidRuntime(21672):    at
> java.lang.reflect.Method.invokeNative(Native Method) 03-22
> 12:30:58.941: E/AndroidRuntime(21672):    at
> java.lang.reflect.Method.invoke(Method.java:511) 03-22 12:30:58.941:
> E/AndroidRuntime(21672):    at com.android.internal.os.ZygoteInit
> $MethodAndArgsCaller.run(ZygoteInit.java:784) 03-22 12:30:58.941:
> E/AndroidRuntime(21672):    at
> com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 03-22
> 12:30:58.941: E/AndroidRuntime(21672):    at
> dalvik.system.NativeStart.main(Native Method)

any ideas?

Osteogenesis

Have you tried to Clean the project from eclipse? – Pursy

Answer 1

I faced a similar problem today.

This fixed it for me:

• Remove all Android Library projects and external jars from the build path.
• Create a folder named 'libs' in your project.
• Place all external .jars in that folder, the ADT should now place them under 'Android Dependencies'.
• Re-import all your previous Android Library projects the normal way.

The issue is that external jars are not placed in the 'libs' folder by default when using Properties - Java Build Path- Add External Jar, instead they are placed under 'Referenced Libraries' instead of 'Android Dependencies' and this causes the NoClassDefFoundError.

Please, check Dealing with dependencies in Android projects for more details.

Carpophore

Could you please extend your post explaining how you would link sources and javadoc with this configuration? – Impertinence

There are some "how-to" fix sources and javadocs in the comments for this the reported issue:Link – Carpophore

Answer 2

1. Right click the project, and choose Properties
2. Go to Java Build Path-Order and Export.
3. Tick 'Android Private Libraries'
4. Click Project, Clean

Aristocratic

It helped me and saved my lots of hours – Shirline

Answer 3

For SDK Tools 17 you need to rename your library project's folder from "lib" to "libs" as suggested here. Also have a look at this.

Estelaestele

Answer 4

This site has the simplest solution which worked for me, select the library's checkbox under "Order and Export".

http://android.foxykeep.com/dev/how-to-fix-the-classdefnotfounderror-with-adt-17

Dealfish

this fixed it for me, but instead of "cleaning" the project, I had to restart eclipse. – Minnaminnaminnie

@CQM, thanks for the comment, for me restarting Eclipse also worked, while cleaning the project did not. – Potaufeu

Answer 5

I created a quick post in my blog explaining how to fix those problems. It has to do with libraries and a change they made on how Eclipse manages libraries now. You can check it here if you want: http://xrigau.wordpress.com/2012/03/22/fix-some-problems-with-libraries-in-the-adt-17-plugin-10/

Autocephalous

Answer 6

Check order and selects in

Project->Properties->Java build path->Order and Export:

Order and select:

select Google APIs (optional)
select Dependencies
select Android Private Libraries
[-] src
[-] gen

And in the tab libraries:

Dependencies Private libraries (jars in 'libs' directory) Others

Worked for me!

Luthern

Answer 7

Check your gson library in build path. maybe gson libraty aren't not accesible.

Allista

Answer 8

This is an official link provided by Android Devs at Google. Go through the article if you are facing NoClassDefFoundException after updating the plugin and/or SDK

https://plus.google.com/115995639636688350464/posts/38o8ZA6xQK4

Nalchik

Answer 9

download the GSON jar and make as class path

Fireplace

Answer 10

I'm using GSON in a library project, so to solve this issue beyond add the GSON jar on build path, I needed declare it on my Library project manifest like as below:

<uses-library android:name="com.google.gson" />

Clayson