Switched to JDK 16. Now have this:
Exception in thread "main" java.lang.module.ResolutionException: Module authlib reads more than one module named cpw.mods.securejarhandler
at java.base/java.lang.module.Resolver.resolveFail(Resolver.java:908)
at java.base/java.lang.module.Resolver.checkExportSuppliers(Resolver.java:729)
at java.base/java.lang.module.Resolver.finish(Resolver.java:379)
at java.base/java.lang.module.Configuration.<init>(Configuration.java:140)
at java.base/java.lang.module.Configuration.resolveAndBind(Configuration.java:494)
at java.base/java.lang.module.Configuration.resolveAndBind(Configuration.java:298)
at cpw.mods.bootstraplauncher@0.1.15/cpw.mods.bootstraplauncher.BootstrapLauncher.main(BootstrapLauncher.java:77)
Can't find much real info on what this means, let alone relating it to what I'm trying to do.
Once again, help appreciated.