# build-system-cnb

**Repository Path**: mirrors_cloudfoundry/build-system-cnb

## Basic Information

- **Project Name**: build-system-cnb
- **Description**: No description available
- **Primary Language**: Unknown
- **License**: Apache-2.0
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 0
- **Created**: 2020-09-24
- **Last Updated**: 2026-03-15

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

# `build-system-cnb`
The Cloud Foundry Build System Buildpack is a Cloud Native Buildpack V3 that enables the building of JVM applications from source.

This buildpack is designed to work in collaboration with other buildpacks.

## Detection
The detection phase passes if

* `<APPLICATION_ROOT>/build.gradle` or `<APPLICATION_ROOT>/build.gradle.kts` exists
  * Contributes `gradle` to the build plan
  * Contributes `jvm-application` to the build plan
  * Contributes `openjdk-jdk` to the build plan

* `<APPLICATION_ROOT>/pom.xml` exists
  * Contributes `maven` to the build plan
  * Contributes `jvm-application` to the build plan
  * Contributes `openjdk-jdk` to the build plan

## Build
If the build plan contains

* `gradle`
  * Contributes a layer marked `cache` and links it to `$HOME/.gradlew`
  * If `<APPLICATION_ROOT>/gradlew` exists
    * Contributes a layer marked `build`, `cache`, and `launch` by running `<APPLICATION_ROOT>/gradlew -x test build`
    * If `$BP_BUILD_ARGUMENTS` exists, uses the specified arguments appended to the executable to build the application
    * Avoids building application if source code has not changed
  * If `<APPLICATION_ROOT>/gradlew` does not exist
    * Contributes Gradle distribution to a layer marked `cache` with all commands on `$PATH`
    * Contributes a layer marked `build`, `cache`, and `launch` by running `<GRADLE_ROOT>/bin/gradle -x test build`
    * If `$BP_BUILD_ARGUMENTS` exists, uses the specified arguments appended to the executable to build the application
    * Avoids building application if source code has not changed
  * Replaces`<APPLICATION_ROOT>` with a link to compiled application layer
  * If `$BP_BUILT_MODULE` exists, prepends a directory to the default glob pattern when searching for the built artifact
  * If `$BP_BUILT_ARTIFACT` exists, uses the specified path (including glob patterns) as the built artifact.  Supersedes `$BP_BUILT_MODULE`.

* `maven`
  * Contributes a layer marked `cache` and links it to `$HOME/.m2`
  * If `<APPLICATION_ROOT>/mvnw` exists
    * Contributes a layer marked `build`, `cache`, and `launch` by running `<APPLICATION_ROOT>/mvnw -Dmaven.test.skip=true package`
    * If `$BP_BUILD_ARGUMENTS` exists, uses the specified arguments appended to the executable to build the application
    * Avoids building application if source code has not changed
  * If `<APPLICATION_ROOT>/mvnw` does not exist
    * Contributes Maven distribution to a layer marked `cache` with all commands on `$PATH`
    * Contributes a layer marked `build`, `cache`, and `launch` by running `<MAVEN_ROOT>/bin/mvn -Dmaven.test.skip=true package`
    * If `$BP_BUILD_ARGUMENTS` exists, uses the specified arguments appended to the executable to build the application
  * Replaces`<APPLICATION_ROOT>` with a link to compiled application layer
  * If `$BP_BUILT_MODULE` exists, prepends a directory to the default glob pattern when searching for the built artifact
  * If `$BP_BUILT_ARTIFACT` exists, uses the specified path (including glob patterns) as the built artifact.  Supersedes `$BP_BUILT_MODULE`.

## License
This buildpack is released under version 2.0 of the [Apache License][a].

[a]: https://www.apache.org/licenses/LICENSE-2.0