Note: GitHub-hosted runners are not currently supported on GitHub Enterprise Server. You can see more information about planned future support on the GitHub public roadmap.
This guide shows you how to create a workflow that performs continuous integration (CI) for your Java project using the Ant build system. The workflow you create will allow you to see when commits to a pull request cause build or test failures against your default branch; this approach can help ensure that your code is always healthy. You can extend your CI workflow to upload artifacts from a workflow run.
GitHub-hosted runners have a tools cache with pre-installed software, which includes Java Development Kits (JDKs) and Ant. For a list of software and the pre-installed versions for JDK and Ant, see "Specifications for GitHub-hosted runners".
You should be familiar with YAML and the syntax for GitHub Actions. For more information, see:
We recommend that you have a basic understanding of Java and the Ant framework. For more information, see the Apache Ant Manual.
Using self-hosted runners on GitHub Enterprise Server
When using setup actions (such as
actions/setup-LANGUAGE) on GitHub Enterprise Server with self-hosted runners, you might need to set up the tools cache on runners that do not have internet access. For more information, see "Setting up the tool cache on self-hosted runners without internet access."
Using the Ant starter workflow
GitHub provides an Ant starter workflow that will work for most Ant-based Java projects. For more information, see the Ant starter workflow.
To get started quickly, you can choose the preconfigured Ant starter workflow when you create a new workflow. For more information, see the "GitHub Actions quickstart."
You can also add this workflow manually by creating a new file in the
.github/workflows directory of your repository.
name: Java CI on: [push] jobs: build: runs-on: ubuntu-latest steps: - uses: actions/checkout@v2 - name: Set up JDK 17 uses: actions/setup-java@v2 with: java-version: '17' distribution: 'temurin' - name: Build with Ant run: ant -noinput -buildfile build.xml
This workflow performs the following steps:
checkoutstep downloads a copy of your repository on the runner.
setup-javastep configures the Eclipse Temurin (Java) 17 JDK by Eclipse Adoptium.
- The "Build with Ant" step runs the default target in your
build.xmlin non-interactive mode.
The default starter workflows are excellent starting points when creating your build and test workflow, and you can customize the starter workflow to suit your project’s needs.
Running on a different operating system
The starter workflow configures jobs to run on Linux, using the GitHub-hosted
ubuntu-latest runners. You can change the
runs-on key to run your jobs on a different operating system. For example, you can use the GitHub-hosted Windows runners.
Or, you can run on the GitHub-hosted macOS runners.
You can also run jobs in Docker containers, or you can provide a self-hosted runner that runs on your own infrastructure. For more information, see "Workflow syntax for GitHub Actions."
Specifying the JVM version and architecture
The starter workflow sets up the
PATH to contain OpenJDK 8 for the x64 platform. If you want to use a different version of Java, or target a different architecture (
x86), you can use the
setup-java action to choose a different Java runtime environment.
For example, to use version 11 of the JDK provided by Adoptium for the x64 platform, you can use the
setup-java action and configure the
architecture parameters to
steps: - uses: actions/checkout@v2 - name: Set up JDK 11 for x64 uses: actions/setup-java@v2 with: java-version: '11' distribution: 'adopt' architecture: x64
For more information, see the
Building and testing your code
You can use the same commands that you use locally to build and test your code.
The starter workflow will run the default target specified in your build.xml file. Your default target will commonly be set to build classes, run tests and package classes into their distributable format, for example, a JAR file.
If you use different commands to build your project, or you want to run a different target, you can specify those. For example, you may want to run the
jar target that's configured in your
steps: - uses: actions/checkout@v2 - uses: actions/setup-java@v2 with: java-version: '17' distribution: 'temurin' - name: Run the Ant jar target run: ant -noinput -buildfile build-ci.xml jar
Packaging workflow data as artifacts
After your build has succeeded and your tests have passed, you may want to upload the resulting Java packages as a build artifact. This will store the built packages as part of the workflow run, and allow you to download them. Artifacts can help you test and debug pull requests in your local environment before they're merged. For more information, see "Persisting workflow data using artifacts."
Ant will usually create output files like JARs, EARs, or WARs in the
build/jar directory. You can upload the contents of that directory using the
steps: - uses: actions/checkout@v2 - uses: actions/setup-java@v2 with: java-version: '17' distribution: 'temurin' - run: ant -noinput -buildfile build.xml - uses: actions/upload-artifact@v2 with: name: Package path: build/jar