1.12.2 Forge Server crashes on startup (Needed Java 8, fixed)

[Starboy47]

I have just installed and re-installed forge-1.12.2-14.23.2.2611-universal into an empty folder using the installer and attempted to run it. Double-clicking gives me a brief second of appearance in task manager, and using a bat file gives me:

 

C:\Users\Kira\Desktop\Starland>java -Xmx1G -Xms1G -jar forge-1.12.2-14.23.2.2611-universal.jar
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(Unknown Source)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.base/java.lang.reflect.Method.invoke(Unknown Source)
        at net.minecraftforge.fml.relauncher.ServerLaunchWrapper.run(ServerLaunchWrapper.java:62)
        at net.minecraftforge.fml.relauncher.ServerLaunchWrapper.main(ServerLaunchWrapper.java:31)
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
 

There is no log, no trace of it. Help?

Edited February 19, 2018 by Starboy47

[Starboy47]

Looks like a similar issue for a different user was solved by reinstalling java 8. Attempting this now.

[Starboy47]

Fixed it, thank you other person who made the same mistake!

[Rocket6488]

Do you also have any more recent versions of java? I'm wanting to make sure I have an up-to-date java