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docs: document the supported Java ceiling and where it comes from #29

	name: Java Agent

	on:
	# Deliberately unfiltered: the Woodpecker pipeline this replaced ran the
	# matrix on every pull request regardless of target, and this repo has
	# several long-lived integration branches that would otherwise get no CI.
	pull_request:
	push:
	branches: [main]

	# Superseded runs are pointless work: a push to a PR branch makes the
	# previous run's result irrelevant. Matters more now that the trigger above
	# is unfiltered and this repo carries a lot of long-lived branches.
	concurrency:
	group: java-agent-${{ github.workflow }}-${{ github.ref }}
	cancel-in-progress: true

	jobs:
	verify:
	name: JDK ${{ matrix.java-version }}
	runs-on: ubuntu-latest
	strategy:
	fail-fast: false
	matrix:
	java-version: ["8", "17", "21"]

	steps:
	- name: Checkout
	uses: actions/checkout@v4

	- name: Set up JDK ${{ matrix.java-version }}
	uses: actions/setup-java@v4
	with:
	distribution: temurin
	java-version: ${{ matrix.java-version }}
	cache: maven

	- name: Build
	run: mvn -B -DskipTests clean verify

	- name: Smoke test Java agent
	run: ./scripts/smoke-javaagent.sh