JDK 17 on GitHub Actions

2021-09-17 / scala

Here’s a quick tutorial of how to test your project on JDK 17 using Ólaf’s olafurpg/setup-scala. As the starting point we’ll use the following setup, which is documented in Setting up GitHub Actions with sbt:

name: CI
on:
  pull_request:
  push:
jobs:
  test:
    strategy:
      fail-fast: false
      matrix:
        include:
          - os: ubuntu-latest
            java: 11
            jobtype: 1
          - os: ubuntu-latest
            java: 11
            jobtype: 2
          - os: ubuntu-latest
            java: 11
            jobtype: 3
    runs-on: ${{ matrix.os }}
    steps:
    - name: Checkout
      uses: actions/checkout@v1
    - name: Setup
      uses: olafurpg/setup-scala@v13
      with:
        java-version: "adopt@1.${{ matrix.java }}"
    - name: Build and test
      run: |
        case ${{ matrix.jobtype }} in
          1)
            sbt -v "mimaReportBinaryIssues; scalafmtCheckAll; +test;"
            ;;
          2)
            sbt -v "scripted actions/*"
            ;;
          3)
            sbt -v "dependency-management/*"
            ;;
          *)
            echo unknown jobtype
            exit 1
        esac
      shell: bash

Let’s say for jobtype 3 we’d like to use JDK 8, and for jobtype 1 and 2 we’d like to test on JDK 17. sbt-ci-release uses jabba to grab the JDKs, and at the moment the openjdk 17.0 distros are not available on jabba yet. However, Eclipse Adoptium fka AdoptOpenJDK does have the binary available, so we can use the custom JDK mode to use it as follows:

syntax	Scala	Python
immutable variable	`val x = 1`	Starlark: `REV = "1.1.0"`
lazy variable	`lazy val x = 1`	n/a
mutable variable	`var x = 1`	in function: `x = 1`
if expression	`if (x > 1) "a" else "b"`	`"a" if x > 1 else "b"`
———————-	—————————-	—————————-
function	`def add3(x: Int): Int =` `x + 3`	`def add3(x):` `return x + 3`
anonymous function	`_ * 2`	not in Starlark: `lambda x: x * 2`
———————-	—————————-	—————————-
List	`val xs = List(1, 2, 3, 4)`	`xs = [1, 2, 3, 4]`
size	`xs.size`	`len(xs)`
empty test	`xs.isEmpty`	`not xs`
head	`xs.head`	`xs[0]`
tail	`// List(2, 3, 4)` `xs.tail`	`# [2, 3, 4]` `xs[1:]`
take	`// List(1, 2)` `xs.take(2)`	`# [1, 2]` `xs[:2]`
drop	`// List(3, 4)` `xs.drop(2)`	`# [3, 4]` `xs[2:]`
drop right	`// List(1, 2, 3)` `xs.dropRight(1)`	`# [1, 2, 3]` `xs[:-1]`
nth element	`xs(2)`	`xs[2]`
map	`xs.map(_ * 2)` `for {` `x <- xs` `} yield x * 2`	`map(lambda x: x * 2, xs)` `[x * 2 for x in xs]`
filter	`xs.filter(_ % 2 == 0)` `for {` `x <- xs if x % 2 == 0` `} yield x`	`filter(lambda x: not x % 2, xs)` `[x for x in xs if not x % 2 ]`
fold from left	`// "a1234"` `xs.foldLeft("a") { _ + _ }`	`from functools import reduce` `# "a1234"` `reduce(lambda a,x: a + str(x), xs, "a")`
membership	`xs.contains(3)`	`3 in xs`
———————-	—————————-	—————————-
String	`val s = "hello"`	`s = "hello"`
variable interpolation	`val count = 3` `s"$count items"`	not in Starlark: `count = 3` `f"{count} items"`
split	`// Array(1.2.3, M1)` `"1.2.3-M1".split("-")`	`# ['1.2.3', 'M1']` `"1.2.3-M1".split("-")`
substring test	`s.contains("el")`	`"el" in s`
———————-	—————————-	—————————-
Map	`val d = Map("a" -> 1,` `“b” -> 2)`	`d = { "a": 1, "b": 2 }`

Scala	JVM	JS (1.x)	JS (0.6.x)	Native (0.4.0-M2)	Native (0.3.x)
3.0.0-M2	✅	✅	n/a	n/a	n/a
3.0.0-M1	✅	✅	n/a	n/a	n/a
2.13.x	✅	✅	✅	n/a	n/a
2.12.x	✅	✅	✅	n/a	n/a
2.11.x	✅	✅	✅	✅	✅

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