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improve documentation and more emphasis to Java 17 (#379)
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@dmitry-shibanov
dmitry-shibanov committed Sep 9, 2022
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# setup-java
# Setup Java

<p align="left">
<a href="https://github.com/actions/setup-java"><img alt="GitHub Actions status" src="https://github.com/actions/setup-java/workflows/Main%20workflow/badge.svg"></a>
</p>
[![Main workflow](https://github.com/actions/setup-java/actions/workflows/workflow.yml/badge.svg)](https://github.com/actions/setup-java/actions/workflows/workflow.yml)

This action provides the following functionality for GitHub Actions runners:
The `setup-java` action provides the following functionality for GitHub Actions runners:
- Downloading and setting up a requested version of Java. See [Usage](#Usage) for a list of supported distributions
- Extracting and caching custom version of Java from a local file
- Configuring runner for publishing using Apache Maven
Expand All @@ -18,33 +16,36 @@ This action provides the following functionality for GitHub Actions runners:
This action allows you to work with Java and Scala projects.

## V2 vs V1
- V2 supports custom distributions and provides support for Zulu OpenJDK, Eclipse Temurin and Adopt OpenJDK out of the box. V1 supports only Zulu OpenJDK
- V2 requires you to specify distribution along with the version. V1 defaults to Zulu OpenJDK, only version input is required. Follow [the migration guide](docs/switching-to-v2.md) to switch from V1 to V2

- V2 supports custom distributions and provides support for Azul Zulu OpenJDK, Eclipse Temurin and AdoptOpenJDK out of the box. V1 supports only Azul Zulu OpenJDK
- V2 requires you to specify distribution along with the version. V1 defaults to Azul Zulu OpenJDK, only version input is required. Follow [the migration guide](docs/switching-to-v2.md) to switch from V1 to V2

## Usage

Inputs `java-version` and `distribution` are mandatory. See [Supported distributions](#supported-distributions) section for a list of available options.

### Basic
**Eclipse Temurin**
### Basic Configuration

#### Eclipse Temurin
```yaml
steps:
- uses: actions/checkout@v3
- uses: actions/setup-java@v3
with:
distribution: 'temurin' # See 'Supported distributions' for available options
java-version: '17'
- run: java -cp java HelloWorldApp
- run: java HelloWorldApp.java
```

**Zulu OpenJDK**
#### Azul Zulu OpenJDK
```yaml
steps:
- uses: actions/checkout@v3
- uses: actions/setup-java@v3
with:
distribution: 'zulu' # See 'Supported distributions' for available options
java-version: '11'
- run: java -cp java HelloWorldApp
java-version: '17'
- run: java HelloWorldApp.java
```

#### Supported version syntax
Expand All @@ -58,18 +59,18 @@ Currently, the following distributions are supported:
| Keyword | Distribution | Official site | License
|-|-|-|-|
| `temurin` | Eclipse Temurin | [Link](https://adoptium.net/) | [Link](https://adoptium.net/about.html)
| `zulu` | Zulu OpenJDK | [Link](https://www.azul.com/downloads/zulu-community/?package=jdk) | [Link](https://www.azul.com/products/zulu-and-zulu-enterprise/zulu-terms-of-use/) |
| `adopt` or `adopt-hotspot` | Adopt OpenJDK Hotspot | [Link](https://adoptopenjdk.net/) | [Link](https://adoptopenjdk.net/about.html) |
| `adopt-openj9` | Adopt OpenJDK OpenJ9 | [Link](https://adoptopenjdk.net/) | [Link](https://adoptopenjdk.net/about.html) |
| `zulu` | Azul Zulu OpenJDK | [Link](https://www.azul.com/downloads/zulu-community/?package=jdk) | [Link](https://www.azul.com/products/zulu-and-zulu-enterprise/zulu-terms-of-use/) |
| `adopt` or `adopt-hotspot` | AdoptOpenJDK Hotspot | [Link](https://adoptopenjdk.net/) | [Link](https://adoptopenjdk.net/about.html) |
| `adopt-openj9` | AdoptOpenJDK OpenJ9 | [Link](https://adoptopenjdk.net/) | [Link](https://adoptopenjdk.net/about.html) |
| `liberica` | Liberica JDK | [Link](https://bell-sw.com/) | [Link](https://bell-sw.com/liberica_eula/) |
| `microsoft` | Microsoft Build of OpenJDK | [Link](https://www.microsoft.com/openjdk) | [Link](https://docs.microsoft.com/java/openjdk/faq)
| `corretto` | Amazon Corretto Build of OpenJDK | [Link](https://aws.amazon.com/corretto/) | [Link](https://aws.amazon.com/corretto/faqs/)

**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:** 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/).
**NOTE:** AdoptOpenJDK 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/).

**NOTE:** For Zulu OpenJDK architectures x64 and arm64 are mapped to x86 / arm with proper hw_bitness.
**NOTE:** For Azul Zulu OpenJDK architectures x64 and arm64 are mapped to x86 / arm with proper hw_bitness.

### Caching packages dependencies
The action has a built-in functionality for caching and restoring dependencies. It uses [actions/cache](https://github.com/actions/cache) under hood for caching dependencies but requires less configuration settings. Supported package managers are gradle, maven and sbt. The format of the used cache key is `setup-java-${{ platform }}-${{ packageManager }}-${{ fileHash }}`, where the hash is based on the following files:
Expand All @@ -88,7 +89,7 @@ steps:
- uses: actions/setup-java@v3
with:
distribution: 'temurin'
java-version: '11'
java-version: '17'
cache: 'gradle'
- run: ./gradlew build --no-daemon
```
Expand All @@ -100,7 +101,7 @@ steps:
- uses: actions/setup-java@v3
with:
distribution: 'temurin'
java-version: '11'
java-version: '17'
cache: 'maven'
- name: Build with Maven
run: mvn -B package --file pom.xml
Expand All @@ -113,13 +114,14 @@ steps:
- uses: actions/setup-java@v3
with:
distribution: 'temurin'
java-version: '11'
java-version: '17'
cache: 'sbt'
- name: Build with SBT
run: sbt package
```

### Check latest

In the basic examples above, the `check-latest` flag defaults to `false`. When set to `false`, the action tries to first resolve a version of Java from the local tool cache on the runner. If unable to find a specific version in the cache, the action will download a version of Java. Use the default or set `check-latest` to `false` if you prefer a faster more consistent setup experience that prioritizes trying to use the cached versions at the expense of newer versions sometimes being available for download.

If `check-latest` is set to `true`, the action first checks if the cached version is the latest one. If the locally cached version is not the most up-to-date, the latest version of Java will be downloaded. Set `check-latest` to `true` if you want the most up-to-date version of Java to always be used. Setting `check-latest` to `true` has performance implications as downloading versions of Java is slower than using cached versions.
Expand All @@ -133,9 +135,9 @@ steps:
- uses: actions/setup-java@v3
with:
distribution: 'adopt'
java-version: '11'
java-version: '17'
check-latest: true
- run: java -cp java HelloWorldApp
- run: java HelloWorldApp.java
```

### Testing against different Java versions
Expand All @@ -145,7 +147,7 @@ jobs:
runs-on: ubuntu-20.04
strategy:
matrix:
java: [ '8', '11', '13', '15' ]
java: [ '8', '11', '17' ]
name: Java ${{ matrix.Java }} sample
steps:
- uses: actions/checkout@v3
Expand All @@ -154,7 +156,7 @@ jobs:
with:
distribution: '<distribution>'
java-version: ${{ matrix.java }}
- run: java -cp java HelloWorldApp
- run: java HelloWorldApp.java
```

### Install multiple JDKs
Expand All @@ -172,7 +174,7 @@ All versions are added to the PATH. The last version will be used and available
15
```

### Advanced
### Advanced Configuration
- [Selecting a Java distribution](docs/advanced-usage.md#Selecting-a-Java-distribution)
- [Eclipse Temurin](docs/advanced-usage.md#Eclipse-Temurin)
- [Adopt](docs/advanced-usage.md#Adopt)
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