Ubuntu Minecraft 服务器 java.lang.ClassCastException: class jdk.internal.loader.ClassLoaders$AppClassLoader [英] Ubuntu Minecraft Server java.lang.ClassCastException: class jdk.internal.loader.ClassLoaders$AppClassLoader

问题描述

我正在尝试运行我的修改过的 mc 服务器.它适用于 wondows，但是当我尝试在 ubuntu 上运行它时，它给了我这个错误:

Im trying to run my modded mc server. It works on wondows but when I try to run it on ubuntu it gives me this error:

    saif@Saif-Ubuntu:~/Desktop/Minecraft Server$ java -Xmx2048M -Xms2048M -jar forge-1.12.2- 
14.23.5.2854.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(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

我试过使用 jdk 11 和 jdk 8，但无论如何我都看不出来.有人知道我可以尝试什么吗?

I tried uding jdk 11 and jdk 8 but for all I can tell neither work. Anyone know anything I can try?

推荐答案

我想出了如何在不卸载任何 Java 版本的情况下切换 Java 版本:'sudo update-alternatives --config java'

I figured out how to switch java versions without uninstalling any: 'sudo update-alternatives --config java'

感谢 Joseph Sible、Novarch 和 Likqez 将我推向正确的方向.

Thanks to Joseph Sible, Novarch, and Likqez for pushing me in the right direction.

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