java.lang.IllegalStateException: Dex archives: setting .DEX extension only for .CLASS files

Question

I build the project at gitlab ci

./gradlew assembleDebug --stacktrace

and sometimes it throws an error:

FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':app:transformClassesWithDexBuilderForDebug'.
> com.android.build.api.transform.TransformException: java.lang.IllegalStateException: Dex archives: setting .DEX extension only for .CLASS files

At my local pc it works correctly.

kotlin version is 1.2

multidex is enabled

What is the reason of this error?

Answer 1

./gradlew clean fixed the same error for me.

Answer 2

For Cordova developers,

If you get this build error in your project, as said Pierrick Martellière in the comments of this answer, in you project folder use :

cordova clean

It makes a cleaning and a build immediately

Answer 3

It seems I found the solution. At the build moment gradle was showing warnings for me:

Configuration 'compile' in project ':app' is deprecated. Use 'implementation' instead.

app: 'androidProcessor' dependencies won't be recognized as kapt annotation processors. Please change the configuration name to 'kapt' for these artifacts: 'com.arello-mobile:moxy-compiler:1.5.3' and apply the kapt plugin: "apply plugin: 'kotlin-kapt'".

I made a misspelling and forgot to remove unnecessary annotationProcessor for library:

annotationProcessor "com.arello-mobile:moxy-compiler:$moxyVersion"
kapt "com.arello-mobile:moxy-compiler:$moxyVersion"

So I removed first line.

After that I applied kapt plugin apply plugin: 'kotlin-kapt' and fixed some build errors in code after it.

After all I realized that I forgot to replace compile to implementation in some places. It is weird but without it build didn't work.

This changes fix my error build.

Answer 4

Simple Solution

For Ionic and Cordove Projects

cordova clean

Answer 5

Above answer is mostly right but in my case, i get this exception when i crate same name java and kotlin file then deletes one of them.

Solutions are: just Build -> Clean Project my project and it works. And my project also enabled multiDex.

defaultConfig {
        ...
        // Enabling multidex support.
        multiDexEnabled true
    }