Due to a bug in the JDK up to Java 11, also see https://github.com/unitsofmeasurement/indriya/issues/301 the "java10" demos using Jigsaw at least require Java 12 to run, therefore they should be migrated into "java12" demos and the "java12" demo turned into a "java13" demo.
Actually the JDK bug spreads all the way to Java 15, so to allow using new features like record without preview the most recent demos are best Java 16.
Due to a bug in the JDK up to Java 11, also see https://github.com/unitsofmeasurement/indriya/issues/301 the "java10" demos using Jigsaw at least require Java 12 to run, therefore they should be migrated into "java12" demos and the "java12" demo turned into a "java13" demo.