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gcr.io/paketo-buildpacks/executable-jar

The Paketo Executable JAR Buildpack is a Cloud Native Buildpack that contributes a Process Type for executable JARs.

Behavior

This buildpack will participate if all the following conditions are met:

  • <APPLICATION_ROOT>/META-INF/MANIFEST.MF contains a Main-Class entry
  • <APPLICATION_ROOT>/**/*.jar exists and that JAR has a /META-INF/MANIFEST.MF file which contains a Main-Class entry

When building a JVM application the buildpack will do the following:

  • Requests that a JRE be installed
  • If <APPLICATION_ROOT> contains an exploded JAR:
    • It contributes <APPLICATION_ROOT> to build and runtime $CLASSPATH
    • If <APPLICATION_ROOT>/META-INF/MANIFEST.MF Class-Path exists
      • Contributes entries to build and runtime $CLASSPATH
  • Contributes executable-jar, task, and web process types

When participating in the build of a native image application the buildpack will:

  • If <APPLICATION_ROOT> contains an exploded JAR:
    • Contributes <APPLICATION_ROOT> to build-time $CLASSPATH
    • If <APPLICATION_ROOT>/META-INF/MANIFEST.MF Class-Path exists
      • Contributes entries to build-time $CLASSPATH

When $BP_LIVE_RELOAD_ENABLE is true:

  • Requests that watchexec be installed
  • Contributes reload process type

Configuration

Environment Variable Description
$BP_LIVE_RELOAD_ENABLED Enable live process reloading. Defaults to false.

License

This buildpack is released under version 2.0 of the Apache License.