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AMP Forge Server start problem


Marcel_Davis

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Hi everyone, 

i recently installed Ubuntu Server and AMP on an old computer. Now if i try to start the forge server i get the following console error:

 


 
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
 
Does anyone know how to solve this problem?
 
Thank you for everything that helps ;)
Edited by Marcel_Davis
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    • Came here for the same reason. But for me it's the client. After following your instructions with the jar, I ended up with the following error. I assume to have chosen the right jar   -jar "${lminecraft_library_path}/net/minecraftforge/forge/1.20.4-49.0.3/forge-1.20.4-49.0.3-shim.jar"   Minecraft 1.20.4 Forge: 1.20.4 - 49.0.3   ;--- cut here --- [7.633s][info][class,load] cpw.mods.jarhandling.SecureJar$ModuleDataProvider source: file:/home/habibiboy/.minecraft/libraries/net/minecraftforge/securemodules/2.2.7/securemodules-2.2.7.jar [7.636s][info][class,load] java.security.CodeSigner source: jrt:/java.base [7.636s][info][class,load] java.nio.file.spi.FileSystemProvider$1 source: jrt:/java.base [7.637s][info][class,load] java.util.ServiceLoader source: shared objects file [7.639s][info][class,load] java.util.ServiceLoader$ModuleServicesLookupIterator source: shared objects file [7.639s][info][class,load] java.util.Spliterators$ArraySpliterator source: shared objects file [7.640s][info][class,load] java.util.Spliterators$1Adapter source: shared objects file [7.643s][info][class,load] java.util.Arrays$ArrayList source: shared objects file [7.648s][info][class,load] java.util.concurrent.CopyOnWriteArrayList$COWIterator source: shared objects file [7.649s][info][class,load] java.util.ServiceLoader$LazyClassPathLookupIterator source: shared objects file [7.649s][info][class,load] java.util.ServiceLoader$2 source: shared objects file [7.649s][info][class,load] java.util.ServiceLoader$3 source: shared objects file [7.652s][info][class,load] jdk.internal.module.ModulePatcher$PatchedModuleReader source: jrt:/java.base [7.654s][info][class,load] sun.net.www.protocol.jrt.Handler source: jrt:/java.base [7.663s][info][class,load] jdk.nio.zipfs.ZipFileSystemProvider source: jrt:/jdk.zipfs [7.667s][info][class,load] java.nio.file.FileSystemNotFoundException source: jrt:/java.base [7.672s][info][class,load] jdk.nio.zipfs.ZipFileSystem source: jrt:/jdk.zipfs [7.675s][info][class,load] java.lang.UnsupportedOperationException source: jrt:/java.base [7.676s][info][class,load] java.util.zip.ZipException source: jrt:/java.base 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Java 17, then Java 21, Searched for missing objects, used strace -ff java ... and so on. The securejar class is there, accessible, permissions all fine. Still running into this issue.
    • sorry for the late answer, I tried it but i hadthe same result crash reportlog
    • Your post triggered the anti-spam which hid it from everyone. Please share a *link* to your debug.log and/or crash report on https://paste.ee to avoid this in future so that you don't have to wait so long for help.
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