See [action.yml](../action.yml) for more details on task inputs.
## Selecting a Java distribution
Inputs `java-version` and `distribution` are mandatory and needs to be provided. See [Supported distributions](../README.md#Supported-distributions) for a list of available options.
**NOTE:** Adopt OpenJDK got moved to Eclipse Temurin and won't be updated anymore. It is highly recommended to migrate workflows from `adopt` to `temurin` to keep receiving software and security updates. See more details in the [Good-bye AdoptOpenJDK post](https://blog.adoptopenjdk.net/2021/08/goodbye-adoptopenjdk-hello-adoptium/).
If your use-case requires a custom distribution or a version that is not provided by setup-java, you can download it manually and setup-java will take care of the installation and caching on the VM:
**NOTE:** The different distributors can provide discrepant list of available versions / supported configurations. Please refer to the official documentation to see the list of supported versions.
***NOTE***: The `settings.xml` file is created in the Actions `$HOME/.m2` directory. If you have an existing `settings.xml` file at that location, it will be overwritten. See [below](#apache-maven-with-a-settings-path) for using the `settings-path` to change your `settings.xml` file location.
If you don't want to overwrite the `settings.xml` file, you can set `overwrite-settings: false`
### Extra setup for pom.xml:
The Maven GPG Plugin configuration in the pom.xml file should contain the following structure to avoid possible issues like `Inappropriate ioctl for device` or `gpg: signing failed: No such file or directory`:
```xml
<configuration>
<!-- Prevent gpg from using pinentry programs -->
<gpgArguments>
<arg>--pinentry-mode</arg>
<arg>loopback</arg>
</gpgArguments>
</configuration>
```
GPG 2.1 requires `--pinentry-mode` to be set to `loopback` in order to pick up the `gpg.passphrase` value defined in Maven `settings.xml`.
### GPG
If `gpg-private-key` input is provided, the private key will be written to a file in the runner's temp directory, the private key file will be imported into the GPG keychain, and then the file will be promptly removed before proceeding with the rest of the setup process. A cleanup step will remove the imported private key from the GPG keychain after the job completes regardless of the job status. This ensures that the private key is no longer accessible on self-hosted runners and cannot "leak" between jobs (hosted runners are always clean instances).
**GPG key should be exported by: `gpg --armor --export-secret-keys YOUR_ID`**
See the help docs on [Publishing a Package](https://help.github.com/en/github/managing-packages-with-github-packages/configuring-apache-maven-for-use-with-github-packages#publishing-a-package) for more information on the `pom.xml` file.
When using an Actions self-hosted runner with multiple shared runners the default `$HOME` directory can be shared by a number runners at the same time which could overwrite existing settings file. Setting the `settings-path` variable allows you to choose a unique location for your settings file.
***NOTE: The `USERNAME` and `PASSWORD` need to correspond to the credentials environment variables used in the publishing section of your `build.gradle`.***
See the help docs on [Publishing a Package with Gradle](https://help.github.com/en/github/managing-packages-with-github-packages/configuring-gradle-for-use-with-github-packages#example-using-gradle-groovy-for-a-single-package-in-a-repository) for more information on the `build.gradle` configuration file.
GitHub Hosted Runners have a tool cache that comes with some Java versions pre-installed. This tool cache helps speed up runs and tool setup by not requiring any new downloads. There is an environment variable called `RUNNER_TOOL_CACHE` on each runner that describes the location of this tools cache and this is where you can find the pre-installed versions of Java. `setup-java` works by taking a specific version of Java in this tool cache and adding it to PATH if the version, architecture and distribution match.
The tools cache gets updated on a weekly basis. For information regarding locally cached versions of Java on GitHub hosted runners, check out [GitHub Actions Virtual Environments](https://github.com/actions/virtual-environments).
The `setup-java` action generates a basic [Maven Toolchains declaration](https://maven.apache.org/guides/mini/guide-using-toolchains.html) for specified Java versions by either creating a minimal toolchains file or extending an existing declaration with the additional JDKs.
### Installing Multiple JDKs With Toolchains
Subsequent calls to `setup-java` with distinct distribution and version parameters will continue to extend the toolchains declaration and make all specified Java versions available.
```yaml
steps:
- uses: actions/setup-java@v3
with:
distribution: '<distribution>'
java-version: |
8
11
- uses: actions/setup-java@v3
with:
distribution: '<distribution>'
java-version: 15
```
The result is a Toolchain with entries for JDKs 8, 11 and 15. You can even combine this with custom JDKs of arbitrary versions:
This will generate a Toolchains entry with the following values: `version: 1.6`, `vendor: jkdfile`, `id: Oracle_1.6`.
### Modifying The Toolchain Vendor For JDKs
Each JDK provider will receive a default `vendor` using the `distribution` input value but this can be overridden with the `mvn-toolchain-vendor` parameter as follows.
This will generate a Toolchains entry with the following values: `version: 1.6`, `vendor: Oracle`, `id: Oracle_1.6`.
In case you install multiple versions of Java at once with multi-line `java-version` input setting the `mvn-toolchain-vendor` still only accepts one value and will use this value for installed JDKs as expected when installing multiple versions of the same `distribution`.
```yaml
steps:
- uses: actions/setup-java@v3
with:
distribution: '<distribution>'
java-version: |
8
11
mvn-toolchain-vendor: Eclipse Temurin
```
### Modifying The Toolchain ID For JDKs
Each JDK provider will receive a default `id` based on the combination of `distribution` and `java-version` in the format of `distribution_java-version` (e.g. `temurin_11`) but this can be overridden with the `mvn-toolchain-id` parameter as follows.
```yaml
steps:
- uses: actions/checkout@v3
- uses: actions/setup-java@v3
with:
distribution: 'temurin'
java-version: '11'
mvn-toolchain-id: 'some_other_id'
- run: java -cp java HelloWorldApp
```
In case you install multiple versions of Java at once you can use the same syntax as used in `java-versions`. Please note that you have to declare an ID for all Java versions that will be installed or the `mvn-toolchain-id` instruction will be skipped wholesale due to mapping ambiguities.
