ScoobyDo

ops meant uninstall J9. also should i be opening the file with Jar launcher

ok i will look into how to into install J9

Well i can get a again error: Last login: Mon Nov 13 21:32:28 on ttys000 iMac:~ adam$ /Users/adam/Desktop/Project\ OZone/start_server.command ; exit; 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 cpw.mods.fml.relauncher.ServerLaunchWrapper.run(ServerLaunchWrapper.java:43) at cpw.mods.fml.relauncher.ServerLaunchWrapper.main(ServerLaunchWrapper.java:12) 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 logout Saving session... ...copying shared history... ...saving history...truncating history files... ...completed. [Process completed] Java version: JDK 8u151

that error was on J8

I was using Java 8, tried java 7 but the same problem comes up what version should i be trying to use?

I have being doing research and can't find any solutions but when i run forge alone it works but I need more ram for the server and this error pops up when I try to run the start.command script that I have found. anyone know how to help I have tried 1.7.10 and 1.12 and both with same problem. any help and possible solutions would be great. Script Code: #!/bin/sh cd "$( dirname "$0" )" java -Xms3G -Xmx4G -jar forge.jar nogui -o true Error: Last login: Mon Nov 13 01:53:09 on ttys001 iMac:~ adam$ /Users/adam/Desktop/Test\ Server\ copy/start_server.command ; exit; 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 cpw.mods.fml.relauncher.ServerLaunchWrapper.run(ServerLaunchWrapper.java:43) at cpw.mods.fml.relauncher.ServerLaunchWrapper.main(ServerLaunchWrapper.java:12) 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 logout Saving session... ...copying shared history... ...saving history...truncating history files... ...completed. [Process completed]