Error while creating a Forge Minecraft server

OS Name/Version: Windows 10

Product Name/Version: AMP Release “Halimede” v2.4.1.2

Problem Description: Gives me an error when I try to start up a 1.16.5 Forge Minecraft server.

Exception in thread "main" java.lang.IllegalAccessError: class cpw.mods.modlauncher.SecureJarHandler (in unnamed module @0xf8c1ddd) cannot access class (in module java.base) because module java.base does not export to unnamed module @0xf8c1ddd
at cpw.mods.modlauncher.SecureJarHandler.lambda$static$1(
at cpw.mods.modlauncher.api.LamdbaExceptionUtils.uncheck(
at cpw.mods.modlauncher.SecureJarHandler.<clinit>(
at cpw.mods.modlauncher.Launcher.lambda$new$6(
at java.base/java.util.concurrent.ConcurrentHashMap.computeIfAbsent(
at cpw.mods.modlauncher.api.TypesafeMap.computeIfAbsent(
at cpw.mods.modlauncher.api.TypesafeMap.computeIfAbsent(
at cpw.mods.modlauncher.Environment.computePropertyIfAbsent(
at cpw.mods.modlauncher.Launcher.<init>(
at cpw.mods.modlauncher.Launcher.main(
at net.minecraftforge.server.ServerMain$Runner.runLauncher(
at net.minecraftforge.server.ServerMain$Runner.access$100(
at net.minecraftforge.server.ServerMain.main(

Steps to reproduce:

  • Start up the server
  • No step 2
  • No step 3

Actions taken to resolve so far:

I have tried re-installing the newest version of the Java JDK.

Not every version of MC uses the latest Java runtime:

In your case you should be using Java 11


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