build

Better support Java 21 (code tweak and CI tests) #177

	name: build

	on:
	push:
	branches: [ main ]
	pull_request:
	branches: [ main ]

	jobs:

	maven-verify:
	name: "Build on Java ${{ matrix.java }}"
	strategy:
	matrix:
	java: [8, 11, 17, 21]
	runs-on: ubuntu-latest
	steps:
	- name: "Checkout sources"
	uses: actions/checkout@v2
	- name: "Set up Java"
	uses: actions/setup-java@v4
	with:
	java-version: ${{ matrix.java }}
	distribution: "temurin"
	cache: 'maven'
	- name: "Get Maven dependencies from cache"
	uses: actions/cache@v2
	with:
	path: ~/.m2/repository
	key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
	restore-keys: ${{ runner.os }}-maven-
	- name: "Build with Maven"
	run: mvn --batch-mode verify

	maven-deploy:
	name: "Deploy snapshot to Sonatype OSSRH"
	needs: maven-verify
	if: ${{ github.ref == 'refs/heads/main' }}
	runs-on: ubuntu-latest
	steps:
	- name: "Checkout sources"
	uses: actions/checkout@v2
	- name: "Setup Java"
	uses: actions/setup-java@v4
	with:
	java-version: 21
	distribution: "temurin"
	server-id: ossrh
	server-username: OSSRH_USERNAME
	server-password: OSSRH_PASSWORD
	- name: "Get Maven dependencies from cache"
	uses: actions/cache@v2
	with:
	path: ~/.m2/repository
	key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
	restore-keys: ${{ runner.os }}-maven-
	- name: "Build and deploy to the Maven Central Repository"
	run: mvn --batch-mode -DskipTests deploy
	env:
	OSSRH_USERNAME: ${{ secrets.OSSRH_USERNAME }}
	OSSRH_PASSWORD: ${{ secrets.OSSRH_PASSWORD }}

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