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README.md
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README.md
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@ -59,7 +59,24 @@ Currently, the following distributions are supported:
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**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.
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#### Testing against different Java versions
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### Check latest
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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 cache. 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 stability and if you want to ensure a specific version of Java is always used.
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The local version of Java in cache gets updated on 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).
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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.
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```yaml
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steps:
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- uses: actions/checkout@v2
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- uses: actions/setup-java@v2-preview
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with:
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distribution: 'adopt'
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java-version: '11'
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check-latest: true
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- run: java -cp java HelloWorldApp
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```
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### Testing against different Java versions
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```yaml
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jobs:
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build:
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@ -90,7 +107,6 @@ jobs:
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- [Publishing using Apache Maven](docs/advanced-usage.md#Publishing-using-Apache-Maven)
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- [Publishing using Gradle](docs/advanced-usage.md#Publishing-using-Gradle)
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## License
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The scripts and documentation in this project are released under the [MIT License](LICENSE)
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