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jlink-openshift App builder

This container bundles together scripts to analyse a Java application with jdeps and generate a stripped jre with only the required Java modules to run that application.

Usage

building

podman build -t jlink ./

running

Assuming you have the following defined locally:

  • $jarfile, a local web application JAR
  • $libdir, directory containing auxillary Java libraries (JARs) for the above
  • $outputjre, where to write the stripped JRE

Invoke as follows

podman run --rm -ti \
    -v "$jarfile":/tmp/run/app.jar \
    -v "$libdir":/tmp/run/lib \
    -v "$outputjre":/tmp/run/out \
    jlink

Script details

Most of the scripts require $JAVA_HOME to be defined.

  • mkdeps.sh: application → jdeps → deps.txt
  • mkstrippeddeps.sh: deps.txt → filtering → stripped-deps.txt
  • generatejdkdeps.sh: stripped-deps.txt → filtering → module-deps.txt
  • mkjreimage.sh: module-deps.txt → jlink → custom JDK
  • runall.sh: runs all of the above