How to restrict kotlin from using java api which is declared above jdk1.6

Question

My compilation environment is jdk1.8 and the runtime is jdk1.6. java gradle plugin has sourceCompatibility attribute. It is valid for java project.
For example: when sourceCompatibility=1.6 , the compiler will report an error if I use api, for example Paths , which is located in jdk1.7.

Attribute

but sourceCompatibility does not work for kotlin project. I understand that this is from the scope of the java extension. But I am strange that the kotlin gradle plugin does not have a similar attribute. ( jvmTarget default attribute 1.6, this does not stop me from using jdk1.7 api)

=== my code ===

kotlin code:

 fun main(args: Array<String>) { val pp = Paths.get("/tmp") ... ... } 

I want the kotlin compiler to report errors, but the compilation was successful,

parent build.gradle :

 buildscript { repositories { jcenter() } dependencies { classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.1.0" } } subprojects { apply plugin: "java" compileJava.sourceCompatibility=1.6 compileJava.targetCompatibility=1.6 compileJava.options.encoding = 'UTF-8' // For ubuntu compileJava.options.bootClasspath = '/usr/lib/jvm/java-6-oracle/jre/lib/rt.jar' } 

child project of kotlin build.gradle :

 apply plugin: 'application' apply plugin: 'kotlin' mainClassName = 'net.cat.ApplictionKt' version='1.0' jar { manifest { attributes 'Implementation-Title': 'xxxx', 'Implementation-Version': version, 'Main-Class': mainClassName } } dependencies { compile "org.jetbrains.kotlin:kotlin-stdlib:1.1.0" compile "org.jetbrains.kotlin:kotlin-reflect:1.1.0" ... ... } 

Answer 1

You can set the jdkHome property of the jdkHome compiler:

 compileKotlin { kotlinOptions { jdkHome = '[path to 1.6 JDK]' } }