Cannot inline bytecode built with JVM target 1 8 into bytecode that is being built with JVM target 1 6

Question

When trying to run the Example CorDapp  GitHub CorDapp  via IntelliJ  I receive the following error   Cannot inline bytecode built with JVM target 1 8 into bytecode that is being built with JVM target 1 6  How can I modify the IntelliJ settings so that all the bytecode is built with the same JVM target

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For recent versions of Android Studio  if changing just the Kotlin Target VM version didn t work   File   Project Structure   Modules  app   set both  Source Compatibility  and  Target Compatibility  to  1 8  Java 8    Press  OK  and sync project with Gradle

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For Gradle with Kotlin language    gradle kts files   add this   android                 kotlinOptions           this as KotlinJvmOptions         jvmTarget    1 8

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In my case  jvmTarget was already set in build gradle file as below   tasks withType org jetbrains kotlin gradle tasks KotlinCompile  all       kotlinOptions           jvmTarget    1 8            But my issue was still there  Finally  it gets resolved after Changing Target JVM version from 1 6 to 1 8 in Preferences   Other Settings   Kotlin Compiler   Target JVM version  see attached picture

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In my case  just changingTarget JVM Version like this   File   Setting   Kotlin Compiler   Target JVM Version   1 8 did not help  However  it does resolved compile time error  But failed at runtime   I also had to add following in app build gradle file to make it work    android           Other code here         kotlinOptions           jvmTarget    1 8

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If using Visual Studio Code   with Kotlin extension  go to the plugin management Crtl   Shift   x  type kotlin and click on manage  the little gear     Configure Extension Settings  on Kotlin    Compiler    Jvm Target - type the java version  In my situation just typed 1 8  And then restart  -      vscode or just  code  for linux

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For me the reason was this configuration in my build gradle was in some modules and in some it wasnt  android               kotlinOptions           val options   this as KotlinJvmOptions         options jvmTarget    1 8            android

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The next solution helped me  Add to build gradle  compileKotlin       kotlinOptions jvmTarget    quot 1 8 quot     compileTestKotlin       kotlinOptions jvmTarget    quot 1 8 quot

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Using the Kotlin Gradle DSL  this solved the issue for me  I added this to the build gradle kts  This is in addition to the answer by Joel  val compileKotlin  KotlinCompile by tasks compileKotlin kotlinOptions jvmTarget   JavaVersion VERSION 1 8 toString

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In my case this code did n work until I move apply plugin   kotlin-android  from bottom to top   apply plugin   com android application  apply plugin   kotlin-android   android               compileOptions           sourceCompatibility JavaVersion VERSION 1 8         targetCompatibility JavaVersion VERSION 1 8            kotlinOptions           jvmTarget    1 8

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Another hint for Eclipse users  After double checking the jvm target settings pointed out by other users  I still had the same problem  and that was caused by missing Kotlin Runtime Library  For eg  when creating a project with spring initializr  it is not added automatically  For adding it  right click on your project - gt  Build path - gt  Add libraries    - gt  User Library  and simply add org jetbrains kotlin core KOTLIN CONTAINER  Make sure you refresh your gradle project afterwards  right click - gt  Gradle - gt  Refresh gradle project

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You can fix this issue as follows    Open the IntelliJ preferences Go to Build  Execution  Deployment   Compiler   Kotlin Compiler BUT Other Settings   Kotlin compiler if Android Studio   3 4 Change the Target JVM version to 1 8 Click Apply

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In my case  I solved this by following these two steps  1  Go to android studio preferences - gt  other settings - gt  kotlin compiler - gt  set Target JVM version   1 8     if it doesn t work then go to the second option   2  In your module-level build gradle file add     compileOptions           sourceCompatibility   1 8         targetCompatibility   1 8           tasks withType org jetbrains kotlin gradle tasks KotlinCompile  all           kotlinOptions               jvmTarget    1 8

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This helped my project to build  add this to module build gradle file  compileOptions           sourceCompatibility 1 8         targetCompatibility 1 8           tasks withType org jetbrains kotlin gradle tasks KotlinCompile  all           kotlinOptions               jvmTarget    quot 1 8 quot

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if you are in android project  in your app s build gradle under android    android    other configs        buildTypes           release               minifyEnabled false             proguardFiles getDefaultProguardFile  proguard-android-optimize txt     proguard-rules pro                      compileOptions           sourceCompatibility JavaVersion VERSION 1 8         targetCompatibility JavaVersion VERSION 1 8           kotlinOptions           jvmTarget    1 8

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I m using Kotlin and Gradle for normal JVM development   not android  and this worked for me in build gradle   allprojects       tasks withType org jetbrains kotlin gradle tasks KotlinCompile  configureEach           kotlinOptions jvmTarget   JavaVersion VERSION 11 toString

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In my case File   Setting   Kotlin Compiler   Target JVM Version   1 8

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All answers here are using gradle but if someone like me ends up here and needs answer for maven        lt build gt           lt sourceDirectory gt src main kotlin lt  sourceDirectory gt           lt testSourceDirectory gt src test kotlin lt  testSourceDirectory gt            lt plugins gt               lt plugin gt                   lt groupId gt org jetbrains kotlin lt  groupId gt                   lt artifactId gt kotlin-maven-plugin lt  artifactId gt                   lt version gt   kotlin version  lt  version gt                   lt executions gt                       lt execution gt                           lt id gt compile lt  id gt                           lt phase gt compile lt  phase gt                           lt goals gt                               lt goal gt compile lt  goal gt                           lt  goals gt                       lt  execution gt                       lt execution gt                           lt id gt test-compile lt  id gt                           lt phase gt test-compile lt  phase gt                           lt goals gt                               lt goal gt test-compile lt  goal gt                           lt  goals gt                       lt  execution gt                   lt  executions gt                   lt configuration gt                       lt jvmTarget gt 11 lt  jvmTarget gt                   lt  configuration gt               lt  plugin gt           lt  plugins gt       lt  build gt    The change from jetbrains archetype for kotlin-jvm is the  lt configuration gt  lt  configuration gt  specifying the jvmTarget  In my case 11

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When the other solutions did not work for you  Changing JVM version on Compiler settings and adding jvmTarget into your build gradle   because of your  iml files trying to force their configurations you can change the target platform from Project Settings    Open File  gt  Project Structure Go to Facets under Project Settings   If it is empty then click on the small   button  Click on your Kotlin module modules Change the Target Platform to JVM 1 8  also it s better to check Use project settings option

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app build gradle  android               compileOptions           sourceCompatibility JavaVersion VERSION 1 8         targetCompatibility JavaVersion VERSION 1 8            kotlinOptions           jvmTarget   JavaVersion VERSION 1 8 toString             GL  Use Java 8 language features

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a picture is worth a thousand words

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Feb 2020  android 3 4  Go to File -  Settings -  Kotlin Compiler -  Target JVM Version   set to 1 8 and then make sure to do File -  Sync project with Gradle files Or add this into build gradle module app  in android block   kotlinOptions              jvmTarget    1 8

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If non of the above answers don t work you can do this in kotlin dsl android            tasks withType lt org jetbrains kotlin gradle tasks KotlinCompile gt            kotlinOptions               jvmTarget    quot 1 8 quot

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you should configure something like as follows in build gradle  tasks withType org jetbrains kotlin gradle tasks KotlinCompile  all       kotlinOptions           jvmTarget    1 8

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Setting sourceCompatibility   JavaVersion VERSION 1 8 enables desugaring  but it is currently unable to desugar all the Java 8 features that the Kotlin compiler uses     Fix - Setting kotlinOptions jvmTarget to JavaVersion VERSION 1 8 in the app module Gradle would fix the issue      Use Java 8 language features    https   developer android com studio write java8-support   android              Configure only for each module that uses Java 8      language features  either in its source code or      through dependencies     compileOptions       sourceCompatibility JavaVersion VERSION 1 8     targetCompatibility JavaVersion VERSION 1 8          For Kotlin projects   kotlinOptions       jvmTarget    1 8

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If you use Eclipse assuming you downloaded the Kotlin plugin   Right click project -  Properties -  Kotlin Compiler -  Enable project specific settings -  JVM target version  1 8

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please add this code to android section inside your app build gradle   compileOptions           sourceCompatibility   JavaVersion VERSION 1 8         targetCompatibility   JavaVersion VERSION 1 8           kotlinOptions           jvmTarget   JavaVersion VERSION 1 8

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As it is written in the using-maven docs from the Kotlin website   You just have to put  lt kotlin compiler jvmTarget gt 1 8 lt  kotlin compiler jvmTarget gt  into the properties section of your pom xml

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If you have many sourcesets modules it can be cumbersome to configure the jvmTarget for each of them separately   You can configure the jvmTarget for all of them at once like so   tasks withType org jetbrains kotlin gradle tasks KotlinCompile  all       kotlinOptions           jvmTarget    1 8            This snippet can be used on top level of your gradle build file  After modifying the gradle file Reimport All Gradle Imports  To check if it worked  open Project Structure and verify that IntelliJ correctly assigned JVM 1 8 to all Kotlin-Modules  It should look like this     I would not recommend changing the platform directly in IntelliJ  because anyone else cloning your project for the first time is likely to face the same issue  Configuring it correctly in gradle has the advantage that IntelliJ is going to behave correctly for them right from the start

User · Answer

Nothing worked for me until I updated my kotlin plugin dependency  Try this  1  Invalidate cahce and restart  2  Sync project  at least try to  3  Go File -  Project Structure -  Suggestions 4  If there is an update regarding Kotlin  update it  Hope it will help someone

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In Android Studio 4 3 2 adding through the below procedure is not working    Open the IntelliJ preferences Go to Build  Execution  Deployment   Compiler   Kotlin Compiler BUT Other Settings   Kotlin compiler if Android Studio   3 4 Change the Target JVM version to 1 8 Click Apply   The reason is  Android studio is unable to add the below code in the module level Gradle file  Please add it manually   kotlinOptions       jvmTarget    1 8      Just for the addon  search Target JVM version in the android studio search  It will take you directly to the option

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You may need to set both compileKotlin and compileTestKotlin  This works on gradle 6 5 1  compileKotlin       kotlinOptions           languageVersion    quot 1 2 quot          apiVersion    quot 1 2 quot          jvmTarget    quot 1 8 quot          javaParameters   true      Useful for reflection           compileTestKotlin       kotlinOptions           languageVersion    quot 1 2 quot          apiVersion    quot 1 2 quot          jvmTarget    quot 1 8 quot          javaParameters   true      Useful for reflection

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If you r facing this message in a Spring Boot Kotlin project  just set the property  kotlin compiler jvmTarget  to  1 8  in your pom xml        lt properties gt           lt kotlin version gt 1 3 70 lt  kotlin version gt           lt kotlin compiler jvmTarget gt 1 8 lt  kotlin compiler jvmTarget gt       lt  properties gt

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in most cases this is enough   compileKotlin       kotlinOptions jvmTarget    1 8    compileTestKotlin       kotlinOptions jvmTarget    1 8      if you have declared custom Gradle tasks like integrationTest for example  add a configuration for compile lt YourTaskName gt Kotlin as well   compileIntegrationTestKotlin       kotlinOptions jvmTarget    1 8

[android] Cannot inline bytecode built with JVM target 1.8 into bytecode that is being built with JVM target 1.6

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