Migrating from Java 8 to 11

[GHPS]

PixelController runs fine under Java version 8 (java8). Since the official date for End-of-Life is getting closer (in parts already past) it's not a bad idea to update to Java 11. Starting PixelController with Java 11 one unfortunately gets the error message

[0,576s][info][class,load] java.util.IdentityHashMap$KeySet source: jrt:/java.base
java.lang.ClassCastException: java.base/jdk.internal.loader.ClassLoaders$AppClassLoader cannot be cast to java.base/java.net.URLClassLoader at org.appstart.Starter.main(Starter.java:74)

Not only for a Python programmer this is rather cryptic - even from a Java perspective the problem seems to be quite hard to fix [1]. While many projects stick to Java 8 in face of upgrade problems [2] the question nevertheless arises:

Has anyone succeed in converting PixelController to Java 11?

1: https://community.oracle.com/thread/4011800 2: https://www.theregister.co.uk/2019/03/07/java_developers_version_8/