polarcoyote

I am setting up a new lan server that I just formatted to Linux Mint 19 Cinnamon 64bit with no customization. I created a new folder and copied in the installer Jar files : minecraft_server.1.12.2.jar forge-1.12.2-14.23.4.2749-installer.jar Ran the vanilla jar with no errors completed first world spawn. Forge installServer ran with no errors. Trying to run the universal.jar gives the following error: A problem occurred running the Server launcher.java.lang.reflect.InvocationTargetException at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.base/java.lang.reflect.Method.invoke(Method.java:564) at net.minecraftforge.fml.relauncher.ServerLaunchWrapper.run(ServerLaunchWrapper.java:70) at net.minecraftforge.fml.relauncher.ServerLaunchWrapper.main(ServerLaunchWrapper.java:34) Caused by: java.lang.ClassCastException: java.base/jdk.internal.loader.ClassLoaders$AppClassLoader cannot be cast to java.base/java.net.URLClassLoader at net.minecraft.launchwrapper.Launch.<init>(Launch.java:34) at net.minecraft.launchwrapper.Launch.main(Launch.java:28) ... 6 more command line : sudo java -jar forge-1.12.2-14.23.4.2749-universal.jar nogui tried with memory switches , without sudo and without nogui, all had same error. universal.jar was initially not executable. corrected with chmod No log files are being generated. folder contents: libraries logs banned-ips.json minecraft_server.1.12.2.jar banned-players.json ops.json eula.txt server.properties forge-1.12.2-14.23.4.2749-installer.jar usercache.json forge-1.12.2-14.23.4.2749-installer.jar.log whitelist.json forge-1.12.2-14.23.4.2749-universal.jar world