Kotlin fails to compile a library

Question

There's this library I created to report exceptions via email. It works well with the Android Java project but fails with Android Kotlin. When I add the compile script for the libary (compile 'com.theah64.bugmailer:bugmailer:1.1.9') and tries to build the APK, am getting below error.

Error:Execution failed for task ':app:transformDexArchiveWithExternalLibsDexMergerForDebug'. > com.android.builder.dexing.DexArchiveMergerException: Unable to merge dex

This is my app's build.gradle file

 apply plugin: 'com.android.application' apply plugin: 'kotlin-android' apply plugin: 'kotlin-android-extensions' android { compileSdkVersion 27 defaultConfig { applicationId "com.theapache64.calculator" minSdkVersion 15 targetSdkVersion 27 versionCode 1 versionName "1.0" testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner" multiDexEnabled true } buildTypes { release { minifyEnabled false multiDexEnabled true proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro' } } dexOptions { preDexLibraries = false javaMaxHeapSize "4g" } } dependencies { implementation fileTree(dir: 'libs', include: ['*.jar']) implementation"org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version" implementation 'com.android.support:appcompat-v7:27.0.2' implementation 'com.android.support.constraint:constraint-layout:1.0.2' implementation 'com.android.support:design:27.0.2' testImplementation 'junit:junit:4.12' androidTestImplementation 'com.android.support.test:runner:1.0.1' androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1' compile 'com.theah64.bugmailer:bugmailer:1.2.0' }

I've googled a lot and tried the multiDexEnabled solution. but it doesn't work.

this may, or may not, be a duplicate of this: stackoverflow.com/questions/46267621/unable-to-merge-dex — TooManyEduardos
– TooManyEduardos, Commented Mar 17, 2018 at 4:36

lelloman · Accepted Answer · 2018-03-19 20:04:59Z

The problem you are having is caused by conflicting dependencies, 2 of your dependencies are defining the same classes. If you try to compile with

./gradlew --stacktrace app:assembleDebug

You would see this error

Caused by: com.android.dex.DexException: Multiple dex files define Lorg/intellij/lang/annotations/MagicConstant;

Now, you can analyze all the dependency trees with

./gradlew app:dependencies

And see these (simplified here):

+--- com.theah64.bugmailer:bugmailer:1.2.0 | +--- org.jetbrains:annotations-java5:15.0

and

 +--- org.jetbrains.kotlin:kotlin-stdlib:1.2.30 | \--- org.jetbrains:annotations:13.0

So, both Kotlin std lib and bugmailer are using org.jetbrains annotation, but from 2 different modules. This causes a problem because the same class (MagicConstant in that case) is being defined twice, I think that the duplicate entries would be even more.

The solution would be to exclude one of the 2 transitive dependencies, for instance

compile('com.theah64.bugmailer:bugmailer:1.2.0') { exclude group: 'org.jetbrains', module: 'annotations-java5' }

You will be able to compile the app, but, keep in mind that this solution is based on the assumption that bugmailer will work just fine with org.jetbrains:annotations:13.0 instead of org.jetbrains:annotations-java5:15.0

@theapache64 I just realized that you are the owner of bugmailer isn't it? I might have dropped you an email then loool :)
haha :D, yeah that's one of my projects. I've fixed the library. Thank you so much.

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