Heroku Cloud Native Buildpack for Java
This is a work in progress (WIP) Heroku Cloud Native Buildpack for Java apps. It uses Maven to build your application and OpenJDK to run it. However, the JDK version can be configured as described below.
How it works
The buildpack will detect your app as Java if it has a pom.xml file, or one of the other POM formats supports by the Maven Polyglot plugin, in its root directory. It will use Maven to execute the build defined by your pom.xml and download your dependencies. The .m2 folder (local maven repository) will be cached between builds for faster dependency resolution, but neither the mvn executable or the .m2 folder will be available in the runtime image.
Usage
To use this buildpack with pack CLI run the following commands:
$ pack build image:tag --builder=heroku/buildpacks
Customizing
This buildpack supports the following environment variables for customization:
MAVEN_CUSTOM_GOALSMAVEN_CUSTOM_OPTSMAVEN_SETTINGS_PATHMAVEN_SETTINGS_URL
You can select the JDK vendor and version using a system.properties file as described in the Heroku documentation on Java.
Development
Run the unit tests (no Internet required):
$ go test ./...
Run the integration tests (Internet required):
$ make test
Licence
MIT