title: Kotlin: Cannot inline bytecode built with JVM target 1.8 into byte code with JVM target 1.6
body: <p>I have an issue when trying to add a few dependencies to my kotlin spring project. I used the spring boot initializer to get a basic project running. </p>
  
  <p>My problem: If I uncomment jackson or either Koin dependency then my build fails with the mentioned in the titile
  Here is the build.gradle.kts file :</p>
  
  <pre><code>    import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
  
  plugins {
      kotlin("plugin.jpa") version "1.3.31"
      id("org.springframework.boot") version "2.2.0.M4"
      id("io.spring.dependency-management") version "1.0.7.RELEASE"
      kotlin("jvm") version "1.3.31"
      kotlin("plugin.spring") version "1.3.31"
  }
  
  group = "com.example"
  version = "0.0.1-SNAPSHOT"
  java.sourceCompatibility = JavaVersion.VERSION_1_8
  
  val developmentOnly by configurations.creating
  configurations {
      runtimeClasspath {
          extendsFrom(developmentOnly)
      }
  }
  
  repositories {
      mavenCentral()
      maven { url = uri("https://repo.spring.io/snapshot") }
      maven { url = uri("https://repo.spring.io/milestone") }
  }
  
  dependencies {
      implementation("org.springframework.boot:spring-boot-starter-data-jpa")
      implementation("org.springframework.boot:spring-boot-starter-thymeleaf")
      implementation("org.springframework.boot:spring-boot-starter-web")
      implementation("com.fasterxml.jackson.module:jackson-module-kotlin")
      implementation("org.jetbrains.kotlin:kotlin-reflect")
      implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8")
      developmentOnly("org.springframework.boot:spring-boot-devtools")
      runtimeOnly("com.h2database:h2")
      testImplementation("org.springframework.boot:spring-boot-starter-test") {
          exclude(group = "org.junit.vintage", module = "junit-vintage-engine")
          exclude(group = "junit", module = "junit")
      }
  
      // jackson
      //implementation("com.fasterxml.jackson.module:jackson-module-kotlin:2.9.+")
  
      // Koin
      //implementation("org.koin:koin-core:2.0.1")
  
      // Koin Test
      //implementation("org.koin:koin-test:2.0.1")
  }
  
  tasks.withType&lt;Test&gt; {
      useJUnitPlatform()
  }
  
  tasks.withType&lt;KotlinCompile&gt; {
      kotlinOptions {
          freeCompilerArgs = listOf("-Xjsr305=strict")
          jvmTarget = "1.8"
      }
  }
  </code></pre>
  
  <p>I Have already tried all the solutions from this previous question someone else asked: <a href="https://stackoverflow.com/questions/48988778/cannot-inline-bytecode-built-with-jvm-target-1-8-into-bytecode-that-is-being-bui">Cannot inline bytecode built with JVM target 1.8 into bytecode that is being built with JVM target 1.6</a></p>
  
  <p>I already had the KotlinCompile jvmTarget option in there and it has been set in my build settings as well. Any help is appreciated thanks!</p>