Gradle wrapper NoClassDefFoundError

Question

When I run ./gradlew I get

Exception in thread "main" java.lang.NoClassDefFoundError: org/gradle/wrapper/GradleWrapperMain Caused by: java.lang.ClassNotFoundException: org.gradle.wrapper.GradleWrapperMain at java.net.URLClassLoader$1.run(URLClassLoader.java:202) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:190) at java.lang.ClassLoader.loadClass(ClassLoader.java:306) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) at java.lang.ClassLoader.loadClass(ClassLoader.java:247)

My project compiles using the Android Studio but stopped compiling from command line

A way to bypass it meanwhile: Installed gradle using `brew install gradle` then run `gradle build` instead of `./gradlew` — Gal Bracha, Sep 04 '14 at 16:43
Try using Gal's technique for downloading Gradle and run `gradle wrapper` to regenerate your wrapper. Perhaps something got mistakenly deleted. — Mark Vieira, Sep 04 '14 at 20:28
Make sure you have `gradle-wrapper.jar` in `gradle/wrapper/` under the project dir. — dmahapatro, Sep 05 '14 at 01:47

score 46 · Accepted Answer · edited Jan 09 '20 at 07:47

46

Probably something went bad. The solution:

Install gradle: brew install gradle
Regenerate wrapper: gradle wrapper

edited Jan 09 '20 at 07:47

Nicolas Raoul

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answered Sep 05 '14 at 21:18

Gal Bracha

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@MohammadRafayAleem if thisworked then you may wanna accept it as "Accepted Answer" by clicking the thick – NecipAllef Sep 21 '15 at 06:42

score 10 · Answer 2 · answered Jun 08 '15 at 18:48

10

See https://github.com/drone/drone/issues/256

My .gitignore had *.jar in it, so I wasn't getting all the jars I needed in my repository.

answered Jun 08 '15 at 18:48

Craig Pemberton

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Thank you, this has also been my problem. Without your hint I probably would have searched endlessly. – Harold L. Brown Mar 10 '20 at 12:30
In this case, you might consider adding both `*.jar` and `!gradle/wrapper/gradle-wrapper.jar` to your `.gitignore` file – diogo Jul 12 '21 at 15:42

score 1 · Answer 3 · answered Feb 19 '18 at 15:25

I had the same, or similar, problem when trying to build my app from command line, but with an exception thrown for 'java.lang.ClassNotFoundException: com.sun.tools.javac.util.Context' which did not happen when building within Android Studio. I found out that AS brings along it's own JRE and I resolved the issue by setting 'JAVA_HOME' to the AS JRE path. In my case it turned into:

$ JAVA_HOME=/opt/android-studio/jre ./gradlew build

You can find this path under 'File' -> 'Project Structure' -> 'SDK Location', see screenshot.

score 1 · Answer 4 · answered Dec 30 '20 at 15:07

I hit this issue when I have a directory with a ":" (no quotes, just a colon) in it.

This was on a linux machine.

Before:

"my:directory"

as in

/Users/me/projects/project1/my:directory/

then i renamed it to

/Users/me/projects/project1/my_directory/

and the error went away.

Gradle wrapper NoClassDefFoundError

4 Answers4