hey guys: - using java 20, trying to play with project panama - using kotlin - built some code with ...

# gradle

[groostav]

hey guys:
• using java 20, trying to play with project panama
• using kotlin
• built some code with rust
• want: use gradle to compile some kotlin running against java 20 with java.lang.foreign (an --enable-preview in java 20)
I have this very strange behaviour where intelliJ (with a gradle imported project) is able to find java.lang.foreign , but gradle is not. I do have gradle itself running on java 17, (I Believe), and I've used `

languageVersion.set(JavaLanguageVersion.of(20))

in addition to

org.gradle.java.installations.paths=C:/Program Files/Zulu/zulu-20-ea

but gradle still seems to be compiling with javac from java-17.

Any help?

[groostav]

bah, I just found

kotlin {
    jvmToolchain {
        languageVersion.set(JavaLanguageVersion.of(20))

but it blows up expecting a maximum of 18 😧

[groostav]

i guess... does a beta gradle 8.0.0 support java 20?

[tapchicoma]

better to ask it in Gradle community slack

[tapchicoma]

for Kotlin specifically you could try to use:

tasks.withType<UsesKotlinJavaToolchain>().configureEach {
    kotlinJavaToolchain.jdk.use(
        "/path/to/local/jdk20", // Put a path to your JDK
        JavaVersion.VERSION_20
    )
}

[groostav]

@tapchicoma thanks, i didnt get back but this worked. I specified that I wanted java 20 and then added a 'custom" java 20 to the toolchain in a config file somewhere (any readers, ping me and ill dig it up for you)