Background: I’ve a spring-boot 2.3 project using reactive driver for cassandra that is built on Java 11. For integration test though, when I spin up an embedded Cassandra database, I rely on presence of Java 8 on the machine with accompanying environment variable JAVA8_HOME.
Question: How can I configure GitHub action setup-java to utilise multiple JDKs for my build and let JAVA_HOME point to Java 11 but JAVA8_HOME point to Java8?
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Answer
Using multiple JDKs with GitHub actions is already possible today. One great and neat way is to leverage the strategy.matrix job configuration like that in your .github/workflows/maven.yml:
name: github
on: [push]
jobs:
build:
runs-on: ubuntu-latest
strategy:
matrix:
java-version: [ 8, 11, 15 ]
steps:
- uses: actions/checkout@v2
- uses: actions/setup-java@v1
with:
java-version: ${{ matrix.java-version }}
- run: mvn -B install --no-transfer-progress --file pom.xml
I didn’t check if this does include the environment variable configuration for JAVA_HOME you need – but it clearly isolates the build environments for the separate Java versions. Here’s a full example project using this setup: https://github.com/codecentric/cxf-spring-boot-starter and here’s a green build log.
Also the GitHub actions GUI for matrix builds is quite nice:
