Add a simple jlink wrapper

[nigredo-tori]

This scans the fullClasspath (using jdeps), and builds a JVM image (using jlink) from all the referenced modules. The image is then "mounted" to a configurable prefix in Universal / mappings (jre/ by default). The image location is then passed to the start scripts with the highest priority (higher than JAVA_HOME).

Potential issues (feedback required):

• I'm not sure how to wire this into the existing CI setup, since the whole thing requires Java 11.
• Java 9 support is theoretically possible, but would require some fiddling with jdeps output. I'm not sure it is worth the trouble.
• It might be better to only limit the image to the standard modules (java.*, javafx.*, jdk.*), since everything else is already provided by the JavaAppPackaging. I can think both of pros and cons to this - maybe this warrants adding a separate incision point for transforming the detected module list?

[muuki88]

World class pull request 😍

Let me check the travis.ymlto see if we can add a new java11 testing stage.

[muuki88]

Adding this to the.travis.yml should probably work

- script: sbt "^validateJdkPackagerTravis"
  name: "scripted jlink tests"
  jdk: oraclejdk11
  if: type = pull_request OR (type = push AND branch = master)

Maybe after https://github.com/sbt/sbt-native-packager/blob/master/.travis.yml#L77

[nigredo-tori]

Adding this to the.travis.yml should probably work

Done this, but I can't check that it works because of the MiMa problem.

[muuki88]

Thanks for your awesome work on this and brining jlinkto native-packager 🎉 🤗

The last nitpick can be fixed in a separate PR if you got the time 😄 I will release this immediately. Also thanks for making sure things are kept binary compatbile.

[muuki88]

well 😂 , you have been faster then me writing my comment. getPath already fixed 👍

[muuki88]

version 1.3.21 is on its way