paketo-buildpacks / executable-jar

A Cloud Native Buildpack that contributes a Process Type for executable JARs.

gcr.io/paketo-buildpacks/executable-jar

The Paketo Buildpack for Executable JAR 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.
$BP_EXECUTABLE_JAR_LOCATION	An optional glob to specify the JAR used as an entrypoint. Defaults to "", which causes the buildpack to do a breadth-first search for the first executable JAR it finds.

License

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