How to set kotlinOptions to --enable-preview in Gradle

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Oliver
创建于

Hello,

I want to use OpenJDK19 with preview features enabled in a IntelliJ project using Kotlin and Gradle. It works for Kotlin. In an IntelliJ project without Gradle I can make use of those new features in JDK19 that are only available when -enable-preview is specified as a VM option.

However, it does not work when building the Kotlin project with Gradle using JDK19 as well, although I have upgraded to Gradle 7.5.1 that supports JDK19. I get this error message:

Unsupported Java. 
Your build is currently configured to use Java 19 and Gradle 7.5.1.

Question is now how to pass --enable-preview to Gradle in a Kotlin project. I have tried this, but it does not work:

tasks.withType<KotlinCompile> {
    kotlinOptions.freeCompilerArgs += "--enable-preview"
    kotlinOptions.jvmTarget = "19"
}

Gradle complains about it: Invalid argument: --enable-preview

I simply cannot find the kotlinOptions-Parameter with which I can start Gradle with VM option --enable-preview.

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Yaroslav Bedrov
创建于

Hello,

Is it possible to provide sample project for investigation? Kotlin doesn't have "--enable-preview" option. It's possible to pass them to JVM:

```

tasks.withType(JavaCompile)

   { options.compilerArgs += "--enable-preview" }

tasks.withType(Test)

    { jvmArgs += "--enable-preview" }

tasks.withType(JavaExec)

    { jvmArgs += "--enable-preview" }

```

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Avatar
Oliver
创建于

Hi Yaroslav,

I tried with your settings, but it also didn't work with a plain Java and Gradle project. Anyhow, I think I was misled, because Gradle 7.5.1 supports JDK18 and apparently not yet JDK19, see https://docs.gradle.org/7.5.1/release-notes.html

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Yaroslav Bedrov
创建于

Oliver,

Seems JDK 19 is under development: https://github.com/gradle/gradle/issues/20372

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