title: Ubuntu Minecraft Server java.lang.ClassCastException: class jdk.internal.loader.ClassLoaders$AppClassLoader
body: <p>Im trying to run my modded mc server. It works on wondows but when I try to run it on ubuntu it gives me this error:</p>
  <pre><code>    saif@Saif-Ubuntu:~/Desktop/Minecraft Server$ 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.&lt;init&gt;(Launch.java:34)
      at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
      ... 6 more
  </code></pre>
  <p>I tried uding jdk 11 and jdk 8 but for all I can tell neither work. Anyone know anything I can try?</p>