How to use `remote_java_repository` with a JDK release where Java home is nested?

[josephglanville]

I'm trying to use remote_java_repository with GraalVM releases on MacOS.

When extracting the package the layout is of the form:

└── Contents
    ├── Home
    │   ├── bin
    │   │   ├── java
    │   │   ├── javac

There are no top level symlinks into the nested bin directory as can be seen in the Zulu JDK releases that remote_java_repository is normally used with.

Would it be possible to make this rule configurable so that the path to the Java home inside the extracted distribution can be customized?

[josephglanville]

On closer inspection I'm not sure if there is something that is causing the files not to be unpacked at all, I can find the tar file in the cache and the path where it was meant to be unpacked but the directory is empty. (hence I run into errors with bin/javac not being found etc)

Any tips on debugging what is going wrong here?

[sgammon]

@josephglanville have you tried strip_prefix?

## Setup: Java

load("@rules_java//toolchains:remote_java_repository.bzl", "remote_java_repository")

GRAALVM_SDK_VERSION = "23.1.0-dev-20230803_2234"

JAVA_VERSION = "21"

JAVA_TOOLCHAIN = "@graalvm//:all"

GRAALVM_DOWNLOAD_PREFIX = "https://github.com/graalvm/graalvm-ce-dev-builds/releases/download"

GRAALVM_PATH_PREFIX = "graalvm-community-openjdk-21+30.1"

remote_java_repository(
    name = "graalvm",
    sha256 = "01e1934581a84467a882be2ca64a735e296e3b7e6f470effff076730fb516e3b",
    strip_prefix = "%s/Contents/Home" % GRAALVM_PATH_PREFIX,
    target_compatible_with = [
        "@platforms//cpu:aarch64",
        "@platforms//os:macos",
    ],
    urls = [
        "%s/%s/graalvm-community-java%s-darwin-aarch64-dev.tar.gz" % (
            GRAALVM_DOWNLOAD_PREFIX,
            GRAALVM_SDK_VERSION,
            JAVA_VERSION,
        ),
    ],
    version = JAVA_VERSION,
)

register_toolchains(
    JAVA_TOOLCHAIN,
)

[sgammon]

@josephglanville i encountered some trouble with this too, so i released rules_graalvm over the weekend, which supports use of GraalVM as a Java toolchain.

[hvadehra]

@josephglanville did https://github.com/bazelbuild/rules_java/issues/102#issuecomment-1676674836 fix this for you?

[josephglanville]

@hvadehra I haven't been back to this project to try out the fix unfortunately.

[hvadehra]

Alright, feel free to ping here if this comes up again.