Server will not start

[AreUThreateningMe]

I am creating a server for myself and a bunch of friends to play on, but i cannot get it to work. I have tried fresh installs of forge and different versions of 1.10.2 and nothing has worked . It gives me this when I try to start it. 

 

A problem occurred running the Server launcher.java.lang.reflect.InvocationTarge
tException
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Nativ
e Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknow
n Source)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Un
known Source)
        at java.base/java.lang.reflect.Method.invoke(Unknown Source)
        at net.minecraftforge.fml.relauncher.ServerLaunchWrapper.run(ServerLaunc
hWrapper.java:62)
        at net.minecraftforge.fml.relauncher.ServerLaunchWrapper.main(ServerLaun
chWrapper.java:31)
Caused by: java.lang.ClassCastException: java.base/jdk.internal.loader.ClassLoad
ers$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
Press any key to continue . . .

 

 

Thanks for any help. 

 

Edit: I tried different versions of forge entirely(1.12 and 1.11) and those also game me the same startup error. 

Edited February 16, 2018 by AreUThreateningMe

[AreUThreateningMe]

Fixed it, reinstalled Java completely. 

[Choonster]

Forge doesn't support Java 9, you need to use Java 8.