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 int

Answer 1

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.

Answer 2

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"
    }
}

Answer 3

In my case, I solved this by following these two steps

1. Go to android studio preferences -> other settings -> kotlin compiler -> 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"
        }
    }

Answer 4

For Gradle with Kotlin language (*.gradle.kts files), add this:

android {
    [...]
    kotlinOptions {
        this as KotlinJvmOptions
        jvmTarget = "1.8"
    }
}

Answer 5

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 = "1.8"
        }
    }

Answer 6

In my case File > Setting > Kotlin Compiler > Target JVM Version > 1.8