Admincraft•2mo ago

Forge modpack crashes on startup

I'm trying to start up a server for SevTech Ages, but the forge jar spits out this error when run with the batch file given:

A problem occurred running the Server launcher.java.lang.reflect.InvocationTargetException
        at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:109)
        at java.base/java.lang.reflect.Method.invoke(Method.java:580)
        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)
        at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
        ... 3 more

A problem occurred running the Server launcher.java.lang.reflect.InvocationTargetException
        at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:109)
        at java.base/java.lang.reflect.Method.invoke(Method.java:580)
        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)
        at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
        ... 3 more

would this have anything to do with an outdated version of java installed? i have JDK 17, 21, and 22 installed on my computer.

6 Replies

Admincraft Meta•2mo ago

Thanks for asking your question!

Make sure to provide as much helpful information as possible such as logs/what you tried and what your exact issue is

Make sure to mark solved when issue is solved!!!

/close !close !solved !answered

Requested by shirasundering#0

Tamz•2mo ago

you need java8

ShiraOP•2mo ago

yeah i had guessed that took a while to find the option in my server manager hence the solved thank you though

Tamz•2mo ago

ah fair enough do /close 🙂

Admincraft Meta•2mo ago

Closed post!

Your post has been marked as solved!

Requested by shirasundering#0

ShiraOP•2mo ago

👍

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Forge modpack crashes on startup

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