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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(NativeMethodAc

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Posted February 15, 20214 yr

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

This topic is now closed to further replies.

https://forums.minecraftforge.net/topic/97752-a-problem-occurred-running-the-server-launcherjavalangreflectinvocationtargetexception-%09at-javabasejdkinternalreflectnativemethodaccessorimplinvoke0native-method-%09at-javabasejdkinternalreflectnativemethodaccessorimplinvokenativemethodac/

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Minecraft crashed after I ran out of storage on one of my disk drives

I've been playing on a world with some friends for a while and I was playing by myself on the world yesterday, (for context the modpack I was playing was Steampunk by Lunarpixel Studios), and I was fighting a boss and I died, I clicked respawn but instead of respawing my game crashed, after reading the error code I realized that the smaller of my two disk drives was full and I needed to delete some files and after freeing up over 60gb of storage I tried to relaunch but the game itself wouldn't launch, after waiting 12 hours, I saved the world files I had elsewhere on my PC and deleted and reinstalled the modpack, after that I was able to relaunch the game and my other worlds but I am still unable to launch the world that me and my friends have been playing on, It was getting stuck on the 'reading data' page but after deleting the files in serverconfig and relaunching, I ran the world again but now it is getting stuck on a blank dirt block screen that comes directly after it, I've tried waiting (I waited for about an hour before I realized that it wasn't going to work) and now I'm here if you guys could please help me that would be greatly appreciated, I really really don't want to lose this world. I've also included the crash report below.
Pastebin
---- Minecraft Crash Report ----// Hi. I'm Connector, and...
Pastebin.com is the number one paste tool since 2002. Pastebin is a website where you can store text online for a set period of time.

By Darkrose0326 · Posted 1 hour ago1 hr
[SOLVED] Connection Lost: Cannot invoke "net.minecraft.nbt.CompoundTag.m_128459_(String)"

Solved, thanks to Alp who bring the issue and it's fix to our Discord.

The culprit is... the mod Avaritia-lite!
Fixed by replacing the mod by AvaritiaNeo

Tip : The mod "connectivity" may help to find and fix this kind of issues
[Netty Client IO #16/WARN] [co.co.Connectivity/]: Network error in:packet_handler with:net.minecraft.client.multiplayer.ClientPacketListener@62ad4368 java.lang.NullPointerException: Cannot invoke "net.minecraft.nbt.CompoundTag.m_128459_(String)" because "nbt" is null

By DrSpuick · 4 hours ago4 hr
Server with modpack RAD 2 problem when joining the server it says incomplete set of tags

Here are the key issues visible in the log:
⚠️ “Incomplete set of tags” error → This usually means the server and client don’t agree on the registry of blocks/items. Some mods are failing to register their tags properly, so the client sees missing definitions.
⚠️ ClassNotFound errors → Several mods (e.g., Biomes O’ Plenty, Dynamic Trees, Dark Utilities, Corpse/Gravestone) are throwing ClassNotFoundException. That indicates the server is missing required mod files or they weren’t loaded correctly.
⚠️ Reference map errors → Multiple mixin reference maps (eidolonrecipes.refmap.json, nethers_delight.refmap.json, etc.) couldn’t be read. While not always fatal, they point to mods not being fully initialized.
⚠️ Potentially Dangerous alternative prefix warnings → Mods like Rats are registering items under unexpected namespaces (rats:block_of_cheese instead of minecraft:block_of_cheese). These mismatches can break tag validation.
⚠️ Modpack reinstall didn’t fix it → Since both client and server were reinstalled but the issue persists, it suggests either:
The server is missing certain mods compared to the client.
The modpack installation didn’t fully sync configs/datapacks.
A corrupted datapack or recipe file is breaking tag loading.
👉 In short: the inability to join is caused by mod mismatches between client and server, specifically missing classes and broken tag registries. The fix would be to carefully verify that the exact same modpack version (including configs and datapacks) is installed on both sides, and check for mods that failed to copy into the server’s mods/ folder.

By Ruen · 9 hours ago9 hr
minecraft

hello boi

By Aures20 · Posted Monday at 08:43 PM1 day
Forge 1.10.2 RTM mod crash launch

Add the crash-report or latest.log (logs-folder) with sites like https://mclo.gs/ and paste the link to it here

By TileEntity · Monday at 07:11 PM1 day

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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(NativeMethodAc

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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(NativeMethodAc

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Minecraft crashed after I ran out of storage on one of my disk drives

[SOLVED] Connection Lost: Cannot invoke "net.minecraft.nbt.CompoundTag.m_128459_(String)"

Server with modpack RAD 2 problem when joining the server it says incomplete set of tags

minecraft

Forge 1.10.2 RTM mod crash launch

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