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Change default Java version to 17 (#165)
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Per [Paketo Java RFC 14](https://github.com/paketo-buildpacks/rfcs/blob/main/text/java/0014-selecting-default-java-version.md) we are changing the default version of Java selected by the buildpack to Java 17.

Signed-off-by: Daniel Mikusa <[email protected]>
Co-authored-by: David O'Sullivan <[email protected]>
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@dmikusa @pivotal-david-osullivan
dmikusa and pivotal-david-osullivan authored Mar 24, 2023
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2 changes: 1 addition & 1 deletion README.md
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Expand Up @@ -43,7 +43,7 @@ The buildpack will do the following if a JRE is requested:

| Environment Variable | Description |
| ----------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `$BP_JVM_VERSION` | Configure the JVM version (e.g. `8`, `11`). The buildpack will download JDK and JRE assets that are compatible with this version of the JVM specification. Since the buildpack only ships a single version of each supported line, updates to the buildpack can change the exact version of the JDK or JRE. In order to hold the JDK and JRE versions stable, the buildpack version itself must be stable.<p/>Buildpack releases (and the dependency versions for each release) can be found [here][bpv]. Few users will use this buildpack directly, instead consuming a language buildpack like `paketo-buildpacks/java` who's releases (and the individual buildpack versions and dependency versions for each release) can be found [here](https://github.com/paketo-buildpacks/java/releases). Finally, some users will will consume builders like `paketobuildpacks/builder:base` who's releases can be found [here](https://hub.docker.com/r/paketobuildpacks/builder/tags?page=1&name=base). To determine the individual buildpack versions and dependency versions for each builder release use the [`pack inspect-builder <image>`](https://buildpacks.io/docs/reference/pack/pack_inspect-builder/) functionality. |
| `$BP_JVM_VERSION` | Configure the JVM version (e.g. `8`, `11`, `17`). The buildpack will download JDK and JRE assets that are compatible with this version of the JVM specification. Since the buildpack only ships a single version of each supported line, updates to the buildpack can change the exact version of the JDK or JRE. In order to hold the JDK and JRE versions stable, the buildpack version itself must be stable.<p/>Buildpack releases (and the dependency versions for each release) can be found [here][bpv]. Few users will use this buildpack directly, instead consuming a language buildpack like `paketo-buildpacks/java` who's releases (and the individual buildpack versions and dependency versions for each release) can be found [here](https://github.com/paketo-buildpacks/java/releases). Finally, some users will will consume builders like `paketobuildpacks/builder:base` who's releases can be found [here](https://hub.docker.com/r/paketobuildpacks/builder/tags?page=1&name=base). To determine the individual buildpack versions and dependency versions for each builder release use the [`pack inspect-builder <image>`](https://buildpacks.io/docs/reference/pack/pack_inspect-builder/) functionality. |
| `$BP_JVM_TYPE` | Configure the JVM type that is provided at runtime, i.e. a JDK or JRE - accepts values "JDK" or "JRE" (default). If a JRE type is requested but not available, a JDK will be provided. |
| `$BPL_JVM_HEAD_ROOM` | Configure the percentage of headroom the memory calculator will allocated. Defaults to `0`. |
| `$BPL_JVM_LOADED_CLASS_COUNT` | Configure the number of classes that will be loaded at runtime. Defaults to 35% of the number of classes. |
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2 changes: 1 addition & 1 deletion buildpack.toml
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Expand Up @@ -129,7 +129,7 @@ api = "0.7"

[[metadata.configurations]]
build = true
default = "11"
default = "17"
description = "the Java version"
name = "BP_JVM_VERSION"

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