coursier jvm-index

This repository hosts and manages the JVM index used by the cs java and cs java-home commands of coursier, and more generally, the JVM management capabilities of coursier.

Available JDKs

JDK	id in index
Eclipse Temurin (recommended / default)	`temurin`
GraalVM community	`graalvm-community`
Oracle JDKs	`oracle`
Azul Zulu	`zulu`
bellsoft Liberica	`liberica`
Amazon Corretto	`corretto`
IBM Semeru	`ibm-semeru`

Legacy JDKs

JDK	id in index
AdoptOpenJDK	`adopt`
Merge of AdoptOpenJDK and Eclipse Temurin JDKs	`adoptium`

Index structure

The index comes in 2 shapes:

a Jabba-compatible single JSON file, index.json
per-OS and CPU architecture indices, under indices/

While the former is only available on GitHub, the latter is also pushed to Maven Central, under the io.get-coursier.jvm.indices organization.

Jabba-compatible index

That index consists in 4 nested JSON objects, with the successive keys of these objects being:

the OS
- linux
- darwin (macOS)
- windows
- linux-musl (for musl libc-based systems, like Alpine Linux),
- aix
- solaris
the CPU architecture
- amd64
- arm64 (a.k.a. aarch64, Raspberry PI or Mac M1-M4 CPUs)
- x86 (32-bit)
- arm (32-bit ARM)
- ppc64
- ppc64le
- s390x
the JDK name, prefixed by jdk@, like
- jdk@temurin
- jdk@graalvm-community
- jdk@liberica
- jdk@zulu
- jdk@corretto
- jdk@java-oracle
- …
the JDK version, often prefixed with 1., like
- 1.8.0-432
- 1.17.0.13
- 1.21.0.5
- 1.23.0.1
- …

The values of the fourth nested object look like

${TYPE}+${URL}

${TYPE} being one of

tgz (for gzip-compressed tar archive JDKs, on Unixes typically)
zip (for zip-compressed JDKs, on Windows typically)

${URL} being the URL of the JDK archive, like https://github.com/adoptium/temurin23-binaries/releases/download/jdk-23.0.1%2B11/OpenJDK23U-jdk_aarch64_mac_hotspot_23.0.1_11.tar.gz.

Value examples

tgz+https://github.com/adoptium/temurin23-binaries/releases/download/jdk-23.0.1%2B11/OpenJDK23U-jdk_aarch64_mac_hotspot_23.0.1_11.tar.gz
zip+https://github.com/adoptium/temurin23-binaries/releases/download/jdk-23%2B37/OpenJDK23U-jdk_x64_windows_hotspot_23_37.zip

Example commands to inspect the index locally:

$ cat "$(cs get https://github.com/coursier/jvm-index/raw/refs/heads/master/index.json)" |
    jq 'keys'
[
  "aix",
  "alpine-linux",
  "darwin",
  "linux",
  "linux-musl",
  "solaris",
  "windows"
]

$ cat "$(cs get https://github.com/coursier/jvm-index/raw/refs/heads/master/index.json)" |
    jq '.darwin | keys'
[
  "amd64",
  "arm64"
]

$ cat "$(cs get https://github.com/coursier/jvm-index/raw/refs/heads/master/index.json)" |
    jq '.darwin.amd64 | keys'
[
  "jdk@corretto",
  "jdk@graalvm-community",
  "jdk@graalvm-oracle",
  "jdk@java-oracle",
  "jdk@liberica",
  "jdk@temurin",
  "jdk@zulu",
  …
]

$ cat "$(cs get https://github.com/coursier/jvm-index/raw/refs/heads/master/index.json)" |
    jq '.darwin.amd64["jdk@temurin"] | keys'
[
  "1.11.0.25",
  "1.16.0.2",
  "1.17.0.13",
  "1.18.0.2.1",
  "1.19.0.2",
  "1.20.0.2",
  "1.21.0.5",
  "1.22.0.2",
  "1.23",
  "1.23.0.1",
  "1.8.0-432",
  …
]

$ cat "$(cs get https://github.com/coursier/jvm-index/raw/refs/heads/master/index.json)" |
    jq '.darwin.amd64["jdk@temurin"]["1.23.0.1"]'
"tgz+https://github.com/adoptium/temurin23-binaries/releases/download/jdk-23.0.1%2B11/OpenJDK23U-jdk_x64_mac_hotspot_23.0.1_11.tar.gz"

Per-OS and CPU architecture indices

These consist in 2 nested JSON objects, whose keys are:

the JDK name, like
- temurin
- graalvm-community
- liberica
- zulu
- corretto
- java-oracle
- …
the JDK version, like
- 8.0-432
- 17.0.13
- 21.0.5
- 23.0.1
- …

The values of the second nested object look like those of the Jabba-compatible index:

${TYPE}+${URL}

${TYPE} being one of

tgz (for gzip-compressed tar archive JDKs, on Unixes typically)
zip (for zip-compressed JDKs, on Windows typically)

${URL} being the URL of the JDK archive, like https://github.com/adoptium/temurin23-binaries/releases/download/jdk-23.0.1%2B11/OpenJDK23U-jdk_aarch64_mac_hotspot_23.0.1_11.tar.gz.

Value examples

tgz+https://github.com/adoptium/temurin23-binaries/releases/download/jdk-23.0.1%2B11/OpenJDK23U-jdk_aarch64_mac_hotspot_23.0.1_11.tar.gz
zip+https://github.com/adoptium/temurin23-binaries/releases/download/jdk-23%2B37/OpenJDK23U-jdk_x64_windows_hotspot_23_37.zip

These indices live at Maven coordinates like

io.get-coursier.jvm.indices:index-${OS}-${CPU}:${INDEX_VERSION}

${OS} being one of:

linux
darwin (macOS)
windows
linux-musl (for musl libc-based systems, like Alpine Linux),
aix
solaris

${CPU} being one of:

amd64
arm64 (a.k.a. aarch64, Raspberry PI or Mac M1-M4 CPUs)
x86 (32-bit)
arm (32-bit ARM)
ppc64
ppc64le
s390x

${INDEX_VERSION} can be found from directory listings or maven-metadata.xml files on Maven Central.

Example commands to inspect such an index locally:

$ unzip -l "$(cs get https://repo1.maven.org/maven2/io/get-coursier/jvm/indices/index-darwin-arm64/0.0.4-70-51469f/index-darwin-arm64-0.0.4-70-51469f.jar)"
Archive:  ~/Library/Caches/Coursier/v1/https/repo1.maven.org/maven2/io/get-coursier/jvm/indices/index-darwin-arm64/0.0.4-70-51469f/index-darwin-arm64-0.0.4-70-51469f.jar
  Length      Date    Time    Name
---------  ---------- -----   ----
      332  11-14-2024 09:51   META-INF/MANIFEST.MF
        0  11-14-2024 09:51   META-INF/
        0  11-14-2024 09:51   coursier/
        0  11-14-2024 09:51   coursier/jvm/
        0  11-14-2024 09:51   coursier/jvm/indices/
        0  11-14-2024 09:51   coursier/jvm/indices/v1/
   157254  11-14-2024 09:51   coursier/jvm/indices/v1/darwin-arm64.json
---------                     -------
   157586                     7 files

$ unzip -p "$(cs get https://repo1.maven.org/maven2/io/get-coursier/jvm/indices/index-darwin-arm64/0.0.4-70-51469f/index-darwin-arm64-0.0.4-70-51469f.jar)" coursier/jvm/indices/v1/darwin-arm64.json |
    jq keys
[
  "corretto",
  "graalvm-community",
  "graalvm-oracle",
  "ibm-semeru",
  "java-oracle",
  "liberica",
  "temurin",
  "zulu",
  …
]

$ unzip -p "$(cs get https://repo1.maven.org/maven2/io/get-coursier/jvm/indices/index-darwin-arm64/0.0.4-70-51469f/index-darwin-arm64-0.0.4-70-51469f.jar)" coursier/jvm/indices/v1/darwin-arm64.json |
    jq '.temurin | keys'
[
  "11.0.25",
  "17.0.13",
  "18.0.2.1",
  "19.0.2",
  "20.0.2",
  "21.0.5",
  "22.0.2",
  "23.0.1",
  …
]

$ unzip -p "$(cs get https://repo1.maven.org/maven2/io/get-coursier/jvm/indices/index-darwin-arm64/0.0.4-70-51469f/index-darwin-arm64-0.0.4-70-51469f.jar)" coursier/jvm/indices/v1/darwin-arm64.json |
    jq '.temurin["23.0.1"]'
"tgz+https://github.com/adoptium/temurin23-binaries/releases/download/jdk-23.0.1%2B11/OpenJDK23U-jdk_aarch64_mac_hotspot_23.0.1_11.tar.gz"

Use by coursier

API

As of writing this (coursier 2.1.18), coursier relies by default on the Jabba-compatible single JSON file index, but is able to use the per-OS and CPU index from Maven Central.

import coursier.cache.FileCache
import coursier.jvm._
val cache = FileCache()
val jvmCache = JvmCache().withDefaultIndex
val javaHomeManager = JavaHome().withCache(jvmCache)
val javaHome = javaHomeManager.get("temurin:21")
  .unsafeRun()(cache.ec)

Using the per-OS and CPU index from Maven Central:

import coursier.cache.FileCache
import coursier.jvm._
val cache = FileCache()
val jvmCache = JvmCache().withIndexChannel(
  coursier.Resolve().finalRepositories.unsafeRun()(cache.ec),
  JvmChannel.central()
)
val javaHomeManager = JavaHome().withCache(jvmCache)
val javaHome = javaHomeManager.get("temurin:21")
  .unsafeRun()(cache.ec)

CLI

The index generated here is now used by the java and java-home commands of coursier.

If you suspect one of those commands doesn't use a newer JVM version, pass --update --ttl 0 to them, like

$ cs java --env --jvm graalvm-community:23 --update --ttl 0

Use by Scala CLI

Scala CLI relies on coursier to manage JDKs. It automatically downloads JDKs if needed, based on the --jvm … option and //> jvm … directive.

Use by Mill

The Mill build tool allows its users to pick a JVM to compile / run / test code. As of writing this, this feature has just been merged via com-lihaoyi/mill#3716

How this repository works

Workflow

The update-index workflow runs daily. It lists available JVMs from various providers, and re-generates the indices. If any change is found, a PR for it is opened.

Maintainers need to pick the PR, check that it doesn't contain anything suspicious, approve it, and merge it.

Upon merge, the Jabba-compatible index is immediately up-to-date. The publish workflow runs and pushes updated per-OS and CPU architecture indices to Maven Central. Once the publish workflow ran successfully, up to a few hours are sometimes needed for the newer indices to be available on Maven Central.

Generating the index locally

Generate an index with

$ GH_TOKEN="****" ./scala-cli.sh src

or

$Env:GH_TOKEN="*****"
scala-cli src

Just ./scala-cli.sh src can work if GH_TOKEN is not set, but it usually gets rate-limited by the GitHub API. You can read more about creating a token here. Just having the public_repo scope will be enough for the access you need.

The index is written in index.json in the current directory.

About

Licensed under the Apache version 2 license.

Name		Name	Last commit message	Last commit date
Latest commit History 410 Commits
.github		.github
indices		indices
publish		publish
src/coursier/jvmindex		src/coursier/jvmindex
.gitignore		.gitignore
.scalafmt.conf		.scalafmt.conf
README.md		README.md
index.json		index.json
scala-cli.sh		scala-cli.sh

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coursier jvm-index

Available JDKs

Legacy JDKs

Index structure

Jabba-compatible index

Per-OS and CPU architecture indices

Use by coursier

API

CLI

Use by Scala CLI

Use by Mill

How this repository works

Workflow

Generating the index locally

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coursier jvm-index

Available JDKs

Legacy JDKs

Index structure

Jabba-compatible index

Per-OS and CPU architecture indices

Use by coursier

API

CLI

Use by Scala CLI

Use by Mill

How this repository works

Workflow

Generating the index locally

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Contributors 13

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