PaulM

Thanks. I'm an idiot! I forgot I had installed it with homebrew. Problem solved!

After running the forge installer for server, I'm trying to run forge-1.12.2-14.23.5.2808-universal.jar but neither the launcher or terminal seem to be able to open it: The Java JAR file "forge-1.12.2-14.23.5.2808-universal.jar" could not be launched. Check the Console for possible error messages Also tried to run from terminal with java -jar forge-1.12.2-14.23.5.2808-universal.jar but it gave the following output: 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:566) 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: class jdk.internal.loader.ClassLoaders$AppClassLoader cannot be cast to class java.net.URLClassLoader (jdk.internal.loader.ClassLoaders$AppClassLoader and java.net.URLClassLoader are in module java.base of loader 'bootstrap') at net.minecraft.launchwrapper.Launch.<init>(Launch.java:34) at net.minecraft.launchwrapper.Launch.main(Launch.java:28) ... 6 more What am I doing wrong? (using OSX High Sierra)