Type com.google.gson.ExclusionStrategy is defined multiple times

Question

I'm getting this error when I try to add an implementation to my app's gradle file for Contentful

Type com.google.gson.ExclusionStrategy is defined multiple times

It looks like something in my intermediate dex file is going on. Here's the full error:

Error: /Users/ceddings/StudioProjects/r15-android-rms-kiosk-launcher/kiosk/build/intermediates/mixed_scope_dex_archive/debug/out/2fcf9ca3ebe4bba6e5de15039706dbd823b837def40fd130c6d32dbf72d7d3fe_1.jar:classes.dex, Type com.google.gson.ExclusionStrategy is defined multiple times: /Users/ceddings/StudioProjects/r15-android-rms-kiosk-launcher/kiosk/build/intermediates/mixed_scope_dex_archive/debug/out/2fcf9ca3ebe4bba6e5de15039706dbd823b837def40fd130c6d32dbf72d7d3fe_1.jar:classes.dex, /Users/ceddings/StudioProjects/r15-android-rms-kiosk-launcher/kiosk/build/intermediates/mixed_scope_dex_archive/debug/out/1c3715710bef6d11c4bd58c73e056adcb809f2dac72c25d60ee538a9010444f0_1.jar:classes.dex

Below is my gradle file. How do I resolve this issue?

dependencies {
implementation project(':sharedcore')
implementation project(':data')
implementation project(':scanner')

implementation deps.kotlin.kotlin_jre
implementation deps.android.app_compat
implementation deps.android.material
implementation deps.android.constraint_layout
implementation deps.logging.timber
implementation deps.retrofit.retrofit
implementation deps.retrofit.retrofit_moshi
implementation deps.moshi.moshi
implementation deps.koin.koin_viewmodel
implementation deps.kotlin.coroutines_core
implementation deps.kotlin.coroutines_android
implementation(deps.auth.adal) {
    exclude group: 'com.android.support', module: 'appcompat-v7'
    exclude group: 'com.google.code.gson', module: 'gson'
}
implementation deps.ms_app_center.analytics
implementation deps.ms_app_center.crashes
implementation deps.viewpager2.viewpager2
implementation deps.contentful.contentful

// Testing
testImplementation deps.testing.junit
testImplementation deps.testing.test_core
testImplementation deps.testing.test_runner
testImplementation deps.testing.test_rules
testImplementation deps.testing.ext_junit
testImplementation deps.testing.mockk
testImplementation deps.testing.mockk_android
testImplementation deps.testing.robolectric
testImplementation deps.testing.espresso_core
testImplementation deps.testing.espresso_intents

}

Answer 1

configurations {
    implementation.exclude module: 'gson' //Remove duplicate dependencies： gson
}