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 sun.security.util.ManifestEntryVerifier (in module java.base) because module java.base does not export sun.security.util to unnamed module @0xf8c1ddd
at cpw.mods.modlauncher.SecureJarHandler.lambda$static$1(SecureJarHandler.java:45)
at cpw.mods.modlauncher.api.LamdbaExceptionUtils.uncheck(LamdbaExceptionUtils.java:95)
at cpw.mods.modlauncher.SecureJarHandler.<clinit>(SecureJarHandler.java:45)
at cpw.mods.modlauncher.Launcher.lambda$new$6(Launcher.java:55)
at java.base/java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1708)
at cpw.mods.modlauncher.api.TypesafeMap.computeIfAbsent(TypesafeMap.java:52)
at cpw.mods.modlauncher.api.TypesafeMap.computeIfAbsent(TypesafeMap.java:47)
at cpw.mods.modlauncher.Environment.computePropertyIfAbsent(Environment.java:62)
at cpw.mods.modlauncher.Launcher.<init>(Launcher.java:55)
at cpw.mods.modlauncher.Launcher.main(Launcher.java:66)
at net.minecraftforge.server.ServerMain$Runner.runLauncher(ServerMain.java:49)
at net.minecraftforge.server.ServerMain$Runner.access$100(ServerMain.java:46)
at net.minecraftforge.server.ServerMain.main(ServerMain.java:43)

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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