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Forge 28.0.14 server tick loop error

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Posted July 25, 20196 yr

I've updated to the latest version of Forge but every time I try to open a world the game crashes immediately with the error:

The game crashed whilst exception in server tick loop
Error: java.lang.NoClassDefFoundError: net/minecraft/world/ServerWorld

This is the crash report:

---- Minecraft Crash Report ----
// Why is it breaking

Time: 25/07/19 12:54
Description: Exception in server tick loop

java.lang.NoClassDefFoundError: net/minecraft/world/ServerWorld
   at com.sk89q.worldedit.forge.ForgeWorldEdit.setupPlatform(ForgeWorldEdit.java:133) ~[?:?] {}
   at com.sk89q.worldedit.forge.ForgeWorldEdit.serverStarted(ForgeWorldEdit.java:192) ~[?:?] {}
   at net.minecraftforge.eventbus.ASMEventHandler_3_ForgeWorldEdit_serverStarted_FMLServerStartedEvent.invoke(.dynamic) ~[?:?] {}
   at net.minecraftforge.eventbus.ASMEventHandler.invoke(ASMEventHandler.java:80) ~[eventbus-0.10.3-milestone.0.1+1a5fa31-service.jar:?] {}
   at net.minecraftforge.eventbus.EventBus.post(EventBus.java:258) ~[eventbus-0.10.3-milestone.0.1+1a5fa31-service.jar:?] {}
   at net.minecraftforge.fml.server.ServerLifecycleHooks.handleServerStarted(ServerLifecycleHooks.java:81) ~[?:?] {}
   at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:598) [?:?] {pl:accesstransformer:B}
   at java.lang.Thread.run(Thread.java:745) [?:1.8.0_51] {}
Caused by: java.lang.ClassNotFoundException: net.minecraft.world.ServerWorld
   at java.lang.ClassLoader.findClass(ClassLoader.java:530) ~[?:1.8.0_51] {}
   at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_51] {}
   at cpw.mods.modlauncher.TransformingClassLoader.loadClass(TransformingClassLoader.java:102) ~[modlauncher-3.0.2.jar:?] {}
   at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_51] {}
   ... 8 more

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- System Details --
Details:
   Minecraft Version: 1.14.4
   Minecraft Version ID: 1.14.4
   Operating System: Windows 10 (amd64) version 10.0
   Java Version: 1.8.0_51, Oracle Corporation
   Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
   Memory: 941024568 bytes (897 MB) / 2147483648 bytes (2048 MB) up to 2147483648 bytes (2048 MB)
   CPUs: 12
   JVM Flags: 9 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xss1M -Xmx2G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M
   FML: New FML!
   Loaded coremods (and transformers): Nothing
   Player Count: 0 / 8; []
   Data Packs: mod:worldedit, mod:forge, vanilla
   Type: Integrated Server (map_client.txt)
   Is Modded: Definitely; Client brand changed to 'forge'

Thanks in advance

July 26, 20196 yr

Author

On 7/25/2019 at 1:05 PM, DorianMuse said:
I've updated to the latest version of Forge but every time I try to open a world the game crashes immediately with the error:
The game crashed whilst exception in server tick loop
Error: java.lang.NoClassDefFoundError: net/minecraft/world/ServerWorld
This is the crash report:

---- Minecraft Crash Report ----
// Why is it breaking

Time: 25/07/19 12:54
Description: Exception in server tick loop

java.lang.NoClassDefFoundError: net/minecraft/world/ServerWorld
   at com.sk89q.worldedit.forge.ForgeWorldEdit.setupPlatform(ForgeWorldEdit.java:133) ~[?:?] {}
   at com.sk89q.worldedit.forge.ForgeWorldEdit.serverStarted(ForgeWorldEdit.java:192) ~[?:?] {}
   at net.minecraftforge.eventbus.ASMEventHandler_3_ForgeWorldEdit_serverStarted_FMLServerStartedEvent.invoke(.dynamic) ~[?:?] {}
   at net.minecraftforge.eventbus.ASMEventHandler.invoke(ASMEventHandler.java:80) ~[eventbus-0.10.3-milestone.0.1+1a5fa31-service.jar:?] {}
   at net.minecraftforge.eventbus.EventBus.post(EventBus.java:258) ~[eventbus-0.10.3-milestone.0.1+1a5fa31-service.jar:?] {}
   at net.minecraftforge.fml.server.ServerLifecycleHooks.handleServerStarted(ServerLifecycleHooks.java:81) ~[?:?] {}
   at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:598) [?:?] {pl:accesstransformer:B}
   at java.lang.Thread.run(Thread.java:745) [?:1.8.0_51] {}
Caused by: java.lang.ClassNotFoundException: net.minecraft.world.ServerWorld
   at java.lang.ClassLoader.findClass(ClassLoader.java:530) ~[?:1.8.0_51] {}
   at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_51] {}
   at cpw.mods.modlauncher.TransformingClassLoader.loadClass(TransformingClassLoader.java:102) ~[modlauncher-3.0.2.jar:?] {}
   at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_51] {}
   ... 8 more

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- System Details --
Details:
   Minecraft Version: 1.14.4
   Minecraft Version ID: 1.14.4
   Operating System: Windows 10 (amd64) version 10.0
   Java Version: 1.8.0_51, Oracle Corporation
   Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
   Memory: 941024568 bytes (897 MB) / 2147483648 bytes (2048 MB) up to 2147483648 bytes (2048 MB)
   CPUs: 12
   JVM Flags: 9 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xss1M -Xmx2G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M
   FML: New FML!
   Loaded coremods (and transformers): Nothing
   Player Count: 0 / 8; []
   Data Packs: mod:worldedit, mod:forge, vanilla
   Type: Integrated Server (map_client.txt)
   Is Modded: Definitely; Client brand changed to 'forge'

Thanks in advance

Updated to Forge 28.0.18 and I still have the same problem

The game crashed whilst exception in server tick loop
Error: java.lang.NoClassDefFoundError: net/minecraft/world/ServerWorld

Crash report:

---- Minecraft Crash Report ----
// Uh... Did I do that?

Time: 26/07/19 19:45
Description: Exception in server tick loop

java.lang.NoClassDefFoundError: net/minecraft/world/ServerWorld
   at com.sk89q.worldedit.forge.ForgeWorldEdit.setupPlatform(ForgeWorldEdit.java:133) ~[?:?] {}
   at com.sk89q.worldedit.forge.ForgeWorldEdit.serverStarted(ForgeWorldEdit.java:192) ~[?:?] {}
   at net.minecraftforge.eventbus.ASMEventHandler_1_ForgeWorldEdit_serverStarted_FMLServerStartedEvent.invoke(.dynamic) ~[?:?] {}
   at net.minecraftforge.eventbus.ASMEventHandler.invoke(ASMEventHandler.java:80) ~[eventbus-0.10.6-service.jar:?] {}
   at net.minecraftforge.eventbus.EventBus.post(EventBus.java:258) ~[eventbus-0.10.6-service.jar:?] {}
   at net.minecraftforge.fml.server.ServerLifecycleHooks.handleServerStarted(ServerLifecycleHooks.java:81) ~[?:?] {}
   at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:598) [?:?] {pl:accesstransformer:B}
   at java.lang.Thread.run(Thread.java:745) [?:1.8.0_51] {}
Caused by: java.lang.ClassNotFoundException: net.minecraft.world.ServerWorld
   at java.lang.ClassLoader.findClass(ClassLoader.java:530) ~[?:1.8.0_51] {}
   at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_51] {}
   at cpw.mods.modlauncher.TransformingClassLoader.loadClass(TransformingClassLoader.java:102) ~[modlauncher-3.0.2.jar:?] {}
   at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_51] {}
   ... 8 more

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- System Details --
Details:
   Minecraft Version: 1.14.4
   Minecraft Version ID: 1.14.4
   Operating System: Windows 10 (amd64) version 10.0
   Java Version: 1.8.0_51, Oracle Corporation
   Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
   Memory: 1227007040 bytes (1170 MB) / 2147483648 bytes (2048 MB) up to 2147483648 bytes (2048 MB)
   CPUs: 12
   JVM Flags: 9 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xss1M -Xmx2G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M
   FML: New FML!
   Loaded coremods (and transformers): Nothing
   Player Count: 0 / 8; []
   Data Packs: mod:worldedit, mod:forge, vanilla
   Type: Integrated Server (map_client.txt)
   Is Modded: Definitely; Client brand changed to 'forge'

July 26, 20196 yr

Can you provide a screenshot of your mods folder?

This is my Forum Signature, I am currently attempting to transform it into a small guide for fixing easier issues using spoiler blocks to keep things tidy.

As the most common issue I feel I should put this outside the main bulk:

The only official source for Forge is https://files.minecraftforge.net, and the only site I trust for getting mods is CurseForge.

If you use any site other than these, please take a look at the StopModReposts project and install their browser extension, I would also advise running a virus scan.

For players asking for assistance with Forge please expand the spoiler below and read the appropriate section(s) in its/their entirety.

Spoiler

Logs (Most issues require logs to diagnose):

Spoiler

Please post logs using one of the following sites (Thank you Lumber Wizard for the list):

https://gist.github.com/: 100MB Requires member (Free)

https://pastebin.com/: 512KB as guest, 10MB as Pro ($$$)

https://hastebin.com/: 400KB

Do NOT use sites like Mediafire, Dropbox, OneDrive, Google Drive, or a site that has a countdown before offering downloads.

What to provide:

...for Crashes and Runtime issues:

Minecraft 1.14.4 and newer:

Post debug.log

Older versions:

Please update...

...for Installer Issues:

Post your installer log, found in the same place you ran the installer

This log will be called either installer.log or named the same as the installer but with .log on the end

Note for Windows users:

Windows hides file extensions by default so the installer may appear without the .jar extension then when the .log is added the log will appear with the .jar extension

Where to get it:

Mojang Launcher: When using the Mojang launcher debug.log is found in .minecraft\logs.

Curse/Overwolf: If you are using the Curse Launcher, their configurations break Forge's log settings, fortunately there is an easier workaround than I originally thought, this works even with Curse's installation of the Minecraft launcher as long as it is not launched THROUGH Twitch:

Spoiler

Make sure you have the correct version of Forge installed (some packs are heavily dependent on one specific build of Forge)
Make a launcher profile targeting this version of Forge.
Set the launcher profile's GameDir property to the pack's instance folder (not the instances folder, the folder that has the pack's name on it).
Now launch the pack through that profile and follow the "Mojang Launcher" instructions above.

Video:

Spoiler

or alternately,

Fallback ("No logs are generated"):

If you don't see logs generated in the usual place, provide the launcher_log.txt from .minecraft

Server Not Starting:

Spoiler

If your server does not start or a command window appears and immediately goes away, run the jar manually and provide the output.

Reporting Illegal/Inappropriate Adfocus Ads:

Spoiler

Get a screenshot of the URL bar or copy/paste the whole URL into a thread on the General Discussion board with a description of the Ad.

Lex will need the Ad ID contained in that URL to report it to Adfocus' support team.

Posting your mod as a GitHub Repo:

Spoiler

When you have an issue with your mod the most helpful thing you can do when asking for help is to provide your code to those helping you. The most convenient way to do this is via GitHub or another source control hub.

When setting up a GitHub Repo it might seem easy to just upload everything, however this method has the potential for mistakes that could lead to trouble later on, it is recommended to use a Git client or to get comfortable with the Git command line. The following instructions will use the Git Command Line and as such they assume you already have it installed and that you have created a repository.

Open a command prompt (CMD, Powershell, Terminal, etc).
Navigate to the folder you extracted Forge’s MDK to (the one that had all the licenses in).
Run the following commands:
1. git init
2. git remote add origin [Your Repository's URL]
  - In the case of GitHub it should look like: https://GitHub.com/[Your Username]/[Repo Name].git
3. git fetch
4. git checkout --track origin/master
5. git stage *
6. git commit -m "[Your commit message]"
7. git push
Navigate to GitHub and you should now see most of the files.
- note that it is intentional that some are not synced with GitHub and this is done with the (hidden) .gitignore file that Forge’s MDK has provided (hence the strictness on which folder git init is run from)
Now you can share your GitHub link with those who you are asking for help.

[Workaround line, please ignore]

July 26, 20196 yr

Author

I only have WorldEdit installed

July 26, 20196 yr

That mod is for 1.14.3 - at least the class it tries to load changed during the 1.14.4 update.

Where did you get it from? And why does it say 'fabric'?

July 26, 20196 yr

Fabric is a different modloader...

This is my Forum Signature, I am currently attempting to transform it into a small guide for fixing easier issues using spoiler blocks to keep things tidy.

As the most common issue I feel I should put this outside the main bulk:

The only official source for Forge is https://files.minecraftforge.net, and the only site I trust for getting mods is CurseForge.

If you use any site other than these, please take a look at the StopModReposts project and install their browser extension, I would also advise running a virus scan.

For players asking for assistance with Forge please expand the spoiler below and read the appropriate section(s) in its/their entirety.

Spoiler

Logs (Most issues require logs to diagnose):

Spoiler

Please post logs using one of the following sites (Thank you Lumber Wizard for the list):

https://gist.github.com/: 100MB Requires member (Free)

https://pastebin.com/: 512KB as guest, 10MB as Pro ($$$)

https://hastebin.com/: 400KB

Do NOT use sites like Mediafire, Dropbox, OneDrive, Google Drive, or a site that has a countdown before offering downloads.

What to provide:

...for Crashes and Runtime issues:

Minecraft 1.14.4 and newer:

Post debug.log

Older versions:

Please update...

...for Installer Issues:

Post your installer log, found in the same place you ran the installer

This log will be called either installer.log or named the same as the installer but with .log on the end

Note for Windows users:

Windows hides file extensions by default so the installer may appear without the .jar extension then when the .log is added the log will appear with the .jar extension

Where to get it:

Mojang Launcher: When using the Mojang launcher debug.log is found in .minecraft\logs.

Spoiler

Make sure you have the correct version of Forge installed (some packs are heavily dependent on one specific build of Forge)
Make a launcher profile targeting this version of Forge.
Set the launcher profile's GameDir property to the pack's instance folder (not the instances folder, the folder that has the pack's name on it).
Now launch the pack through that profile and follow the "Mojang Launcher" instructions above.

Video:

Spoiler

or alternately,

Fallback ("No logs are generated"):

If you don't see logs generated in the usual place, provide the launcher_log.txt from .minecraft

Server Not Starting:

Spoiler

If your server does not start or a command window appears and immediately goes away, run the jar manually and provide the output.

Reporting Illegal/Inappropriate Adfocus Ads:

Spoiler

Get a screenshot of the URL bar or copy/paste the whole URL into a thread on the General Discussion board with a description of the Ad.

Lex will need the Ad ID contained in that URL to report it to Adfocus' support team.

Posting your mod as a GitHub Repo:

Spoiler

Open a command prompt (CMD, Powershell, Terminal, etc).
Navigate to the folder you extracted Forge’s MDK to (the one that had all the licenses in).
Run the following commands:
1. git init
2. git remote add origin [Your Repository's URL]
  - In the case of GitHub it should look like: https://GitHub.com/[Your Username]/[Repo Name].git
3. git fetch
4. git checkout --track origin/master
5. git stage *
6. git commit -m "[Your commit message]"
7. git push
Navigate to GitHub and you should now see most of the files.
- note that it is intentional that some are not synced with GitHub and this is done with the (hidden) .gitignore file that Forge’s MDK has provided (hence the strictness on which folder git init is run from)
Now you can share your GitHub link with those who you are asking for help.

[Workaround line, please ignore]

July 26, 20196 yr

Author

I got it from CurseForge. As for 'fabric'. I have no idea

July 26, 20196 yr

There is no forge 1.14.4 compatible version listed there. So the mod is not yet compatible with 1.14.4

July 26, 20196 yr

Author

Alright, thanks Guess I'll just have to wait, then

1 year later...

November 3, 20204 yr

I have the same problem however the mod I want to use is compatible with forge. The mod is for 1.7.10 and I'm using 1.7.10. Is it because the version is too old?

Edited November 3, 20204 yr by cats

4 yr4 yr Guest locked this topic

This topic is now closed to further replies.

https://forums.minecraftforge.net/topic/73565-forge-28014-server-tick-loop-error/

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I agree, and that's why I've enabled the RSS notifications for the forums on my phone. Often times it is difficult to share things on here that can be condensed into a single forum post. As for development, the discussion that happens on GitHub is not for releases but rather for the active development of the feature itself. I'm happy to discuss more things on the forums in the future, but I've been more focused on keeping my head down and getting things working. There's still a lot to do with the toolchain before I can do more things on the forums and the Forge project itself.

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Why Has the Forge Development Forum Become So Empty?

Yeah, you’re totally right — it’s been noticeably quieter here over the past few years. Most of the modding discussion has definitely shifted to Discord servers and sometimes Reddit, since they offer faster responses and real-time collaboration.
Forums like this used to be the main hub for documentation and troubleshooting, but now people prefer quick chats or sharing snippets on GitHub and Discord. The downside is that a lot of useful info gets buried or lost over time instead of being archived like it was here.

By RyanMitch52 · 6 minutes ago6 min
java.util.ConcurrentModificationException: null - Exception in server tick loop

Use Java 17 instead of Java 21

By TileEntity · 8 hours ago8 hr
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Add the crash-report or latest.log (logs-folder) with sites like https://mclo.gs/ and paste the link to it here

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Forge 28.0.14 server tick loop error

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