javagradletoolchain

Gradle - get the installation directory of a resolved java toolchain


I have a gradle project which applies the following configuration:

java {
    toolchain {
        languageVersion = JavaLanguageVersion.of(17)
        vendor = JvmVendorSpec.AMAZON
    }
}

In the same project I have a task responsible for compiling some C++ code, and that C++ code has a dependency on some JDK headers and libraries. I would like to acquire the installation directory (JAVA_HOME) of the resolved toolchain so I can provide that to the C++ compiler, ensuring the same JDK is used for compiling both the java components and the native components.

Is there any way to do this? I've looked at JavaToolchainSpec but it appears the specification isn't evaluated into a JavaCompiler until it's actually used inside specific tasks defined by the java plugin. Unfortunately the native compilation task which requires it is just a standard exec task.

I am using gradle version 8.2


Solution

  • In the documentation, you can find how to get the JAVA_HOME in a task

    def launcher = javaToolchains.launcherFor {
        languageVersion.set(JavaLanguageVersion.of(11))
    }
    
    tasks.named('anotherSampleTask') {
        javaHome = launcher.map { it.metadata.installationPath }
    }