This is a demo project to show some new features of Java™ 15.
It uses --enable-preview and Maven, but you don't need to have Maven installed.
To run this project, you need to have Java™ 15 installed. You can use https://sdkman.io/ and/or https://openjdk.java.net/, https://adoptopenjdk.net/.
If you'd like to run the example app, one of the options is this:
$ MAVEN_OPTS="--enable-preview" ./mvnw exec:java -pl goodies
(If it doesn't work, you might have Java 15 not installed.)
Understand: https://openjdk.java.net/jeps/343
$ ./mvnw package
$ cp records/target/records-1.0-SNAPSHOT.jar records/target/lib/
$ jpackage --name DDJ15RECORDS --input records/target/lib --main-jar records-1.0-SNAPSHOT.jar --dest records/target