如何将Gradle项目中的Kotlin字节码版本设置为Java8？

Question

我目前的设置是这样的。

buildscript {
    ext {
        kotlinVersion = '1.0.5-2'
        springBootVersion = '1.4.2.RELEASE'
    }
    repositories { mavenCentral() }
    dependencies {
        classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
        classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:${kotlinVersion}")
    }
}

apply plugin: 'kotlin'
apply plugin: 'org.springframework.boot'

tasks.withType(JavaCompile) {
    sourceCompatibility = JavaVersion.VERSION_1_8
    targetCompatibility = JavaVersion.VERSION_1_8
}

## I also tried this and it hasn't helped
#sourceCompatibility = 1.8
#targetCompatibility = 1.8

repositories { mavenCentral() }

dependencies {
    compile("org.jetbrains.kotlin:kotlin-stdlib:${kotlinVersion}")
    compile('org.springframework.cloud:spring-cloud-starter-stream-rabbit')
}

dependencyManagement { imports { mavenBom "org.springframework.cloud:spring-cloud-dependencies:Camden.SR2" } }

Answer 1

正如Mark在Debop的回答中指出的那样，您必须配置compileKotlin和compileStkotlin。您可以这样做而不重复：

tasks.withType(org.jetbrains.kotlin.gradle.tasks.KotlinCompile).all {
  kotlinOptions {
    jvmTarget = "1.8"
  }
}

对于纯Kotlin项目，我认为选项sourceCompatibility和targetcompatibility不会起任何作用，因此可以删除它们。

参考:https://kotlinlang.org/docs/reference/using-gradle.html#编译器-options