GitHub Action to read values from Java's .properties files.

Returning a single property is as simple as:

- uses: madhead/read-java-properties@latest
  id: version
  with:
    file: gradle.properties
    property: version
    default: 0.0.1

- run: echo ${{ steps.version.outputs.value }} # Project's version from gradle.properties or 0.0.1 if it is not defined there

Alternatively, you could return all the values from the .properties file by employing the all flag:

- uses: madhead/read-java-properties@latest
  id: all
  with:
    file: gradle.properties
    all: true

- run: echo ${{ steps.all.outputs.version }} # Project's version from gradle.properties
- run: echo ${{ steps.all.outputs.groupId }} # Project's groupID from gradle.properties
  …

To see the list of available versions of this action (latest in the example above), navigate to the Releases & Tags page of this repo. Whenever a new version is released, corresponding tags are created / updated. latest tag always points to the latest release. master label could also be used, being a synonym to latest. There are also $major and $major.$minor tags pointing to the latest matching version (i.e. tag 1 always points to the latest 1.x version, and tag 1.1 — to the latest 1.1.x version).

To see this action… in action… check its integration test in test.yml.

Note, that due to the environment variables "leaking" from the workflow into the Docker container actions, if your workflow defines a JAVA_HOME variable, this action would fail.

Try not to set JAVA_HOME before running this action until this "leakage" is "fixed" by the GitHub Actions team. Which might never happen and be an unpleasant "feature" of GitHub Actions.

Read more about this issue in #28 and check the minimal reproducible example.