java.lang.NoClassDefFoundError: com/android/build/gradle/AppPlugin

[Egorand]

Gradle 4.4.1, Android Gradle Plugin 3.0.1

I'm trying to add the plugin to https://github.com/hzsweers/CatchUp via the plugins block in the top-level build.gradle file. The build fails with the following error:

FAILURE: Build failed with an exception.

* What went wrong:
A problem occurred configuring project ':app'.
> Failed to notify project evaluation listener.
   > Could not resolve all dependencies for configuration ':app:kapt'.
      > A problem occurred configuring project ':bypass'.
         > Failed to notify project evaluation listener.
            > com/android/build/gradle/BaseExtension
   > com/android/build/gradle/BaseExtension

Here's a part of the stacktrace that looks relevant:

Caused by: java.lang.NoClassDefFoundError: com/android/build/gradle/BaseExtension
        at org.jlleitschuh.gradle.ktlint.KtlintPlugin$addKtLintTasksToAndroidKotlinPlugin$1$1.execute(KtlintPlugin.kt:72)
        at org.jlleitschuh.gradle.ktlint.KtlintPlugin$addKtLintTasksToAndroidKotlinPlugin$1$1.execute(KtlintPlugin.kt:26)
        at org.gradle.internal.event.BroadcastDispatch$ActionInvocationHandler.dispatch(BroadcastDispatch.java:91)
        at org.gradle.internal.event.BroadcastDispatch$ActionInvocationHandler.dispatch(BroadcastDispatch.java:80)
        at org.gradle.internal.event.AbstractBroadcastDispatch.dispatch(AbstractBroadcastDispatch.java:42)
        at org.gradle.internal.event.BroadcastDispatch$SingletonDispatch.dispatch(BroadcastDispatch.java:230)
        at org.gradle.internal.event.BroadcastDispatch$SingletonDispatch.dispatch(BroadcastDispatch.java:149)
        at org.gradle.internal.event.AbstractBroadcastDispatch.dispatch(AbstractBroadcastDispatch.java:58)
        ... 153 more
Caused by: java.lang.ClassNotFoundException: com.android.build.gradle.BaseExtension
        ... 161 more

Any special considerations when running the plugin on Android?

[Tapchicoma]

Support for Android gradle 3.x plugin is already merged into master, but new plugin version hasn't been released.

@JLLeitschuh will do soon a new plugin release.

[Egorand]

Great, thanks!

[JLLeitschuh]

This has just been published as version 3.0.0

[Egorand]

I tried it out and I seem to be getting a similar error:

Caused by: java.lang.NoClassDefFoundError: com/android/build/gradle/AppPlugin
        at org.jlleitschuh.gradle.ktlint.KtlintPlugin$addKtLintTasksToAndroidKotlinPlugin$1$1.execute(KtlintPlugin.kt:77)
        at org.jlleitschuh.gradle.ktlint.KtlintPlugin$addKtLintTasksToAndroidKotlinPlugin$1$1.execute(KtlintPlugin.kt:31)
        at org.gradle.internal.event.BroadcastDispatch$ActionInvocationHandler.dispatch(BroadcastDispatch.java:91)
        at org.gradle.internal.event.BroadcastDispatch$ActionInvocationHandler.dispatch(BroadcastDispatch.java:80)
        at org.gradle.internal.event.AbstractBroadcastDispatch.dispatch(AbstractBroadcastDispatch.java:42)
        at org.gradle.internal.event.BroadcastDispatch$SingletonDispatch.dispatch(BroadcastDispatch.java:230)
        at org.gradle.internal.event.BroadcastDispatch$SingletonDispatch.dispatch(BroadcastDispatch.java:149)
        at org.gradle.internal.event.AbstractBroadcastDispatch.dispatch(AbstractBroadcastDispatch.java:58)
        ... 153 more

Is my understanding correct that I should just add id "org.jlleitschuh.gradle.ktlint" version "3.0.0" to the plugins block in the top-level build.gradle when setting up an Android project?

[Tapchicoma]

In your case you have applied ktlint plugin via plugins block, while project applies android gradle plugin using old-way via classpath. Such scenario seems not working as ktlint can't find expected classes from android plugin.

I've tried to apply ktlint via classpath to this project and it works.

[Egorand]

Oh right, that makes sense. The old way seems to work, thanks for the help!

[ganeshpadhayay]

If anyone is still facing this issue, then please check the compatibility of Gradle version used in the project and the version of Gradle plugin which studio is using