Log Files

Logfiles are an essential part when it comes to debugging your server and figuring what went wrong. This page contains logfiles from SpongeForge and SpongeVanilla servers including short descriptions.

SpongeForge logfiles

SpongeForge writes several logfiles to the /logs folder located inside your servers directory. As of Forge 1521 these are:

  1. fml-junk-earlystartup.log
  2. fml-server-latest.log
  3. latest.log

fml-junk-earlystartup.log

Note

Only a few example lines are shown here. To read the full example log, follow this link: SpongeForge 1521 fml-junk-earlystartup.log file

fml-server-latest.log

Note

Only a few example lines are shown here. To read the full example log, follow this link: SpongeForge 1521 fml-server-latest.log

[main/INFO] [FML/]: Forge Mod Loader version 11.14.3.1521 for Minecraft 1.8 loading
[main/INFO] [FML/]: Java is Java HotSpot(TM) 64-Bit Server VM, version 1.8.0_51, running on Windows 8.1:amd64:6.3, installed at ##PATH_TO_JAVA_HERE##
[main/DEBUG] [FML/]: Java classpath at launch is forge.jar
[main/DEBUG] [FML/]: Java library path at launch is ##PATH_TO_JAVA_HERE##

The example log indicates that we’re running:

  • Forge 11.14.3.1521 (Version 1521)
  • Java 8 64bit Update 51
  • Windows 8.1 x64
  • the directory Java was installed to (Line 4)

Warning

SpongeForge won’t run on Java 6 (1.6.x) or Java 7 (1.7.x). If you encounter an error stating that you run an older Java build than Java 8, please update your JRE to 1.8.x and try again!

[main/DEBUG] [FML/]: Examining for coremod candidacy spongeforge-1.8-1521-2.1-DEV-750.jar
[main/INFO] [FML/]: Loading tweaker org.spongepowered.asm.launch.MixinTweaker from spongeforge-1.8-1521-2.1-DEV-750.jar

This indicates that SpongeForge 750 was found and loaded by Forge. For further help regarding the SpongeForge naming scheme, have a look here: Installing SpongeForge.

latest.log

Note

Only a few example lines are shown here. To read the full example log, follow this link: SpongeForge 1521 latest.log

This is the output that you would see in the Minecraft server GUI.

SpongeVanilla logfiles

latest.log

Note

Only a few example lines are shown here. To read the full example log, follow this link: SpongeVanilla 47 latest.log

This is the output that you would see in the Minecraft server GUI.

Reading logfiles

If you’re unsure on how to read a common crashlog, you’ll find help here, but first we need a crashlog. For this short introduction we will just use an example crash from the Debugging page: Example crashlog of an outdated SpongeForge build.

WARNING: coremods are present:
SpongeCoremod (sponge-1.8-1499-2.1DEV-575.jar)
Contact their authors BEFORE contacting forge

The first thing you’ll notice is a Warning that coremods are present. Nothing to worry about here, that’s not an error, just a warning to contact Sponge support, not Forge.

java.lang.NoClassDefFoundError: org/spongepowered/api/event/game/state/GameStartingServerEvent

A few lines below the actual error is found. In this case it’s a NoClassDefFoundError If you’re unsure what that means, head over to our Debugging page. If it’s a common error, it will be listed there. If it isn’t, you can always ask on the forums for help! Make sure you provide the full crashlog.

Luckily your systems details are included at the bottom of the crashlog:

Minecraft Version: 1.8
Operating System: Windows 8.1 (amd64) version 6.3
Java Version: 1.8.0_51, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 515666256 bytes (491 MB) / 782761984 bytes (746 MB) up to 1847590912 bytes (1762 MB)
JVM Flags: 0 total;
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
FML: MCP v9.10 FML v8.0.99.99 Minecraft Forge 11.14.3.1521 5 mods loaded, 5 mods active
States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
UC     mcp{9.05} [Minecraft Coder Pack] (minecraft.jar)
UC     FML{8.0.99.99} [Forge Mod Loader] (forge.jar)
UC     Forge{11.14.3.1521} [Minecraft Forge] (forge.jar)
UC     Sponge{1.8-1499-2.1DEV-575} [SpongeForge] (minecraft.jar)
U      Core{unknown} [Core Plugin] (Core.jar)
Loaded coremods (and transformers):
SpongeCoremod (sponge-1.8-1499-2.1DEV-575.jar)

This indicates that

  • Minecraft 1.8 with Forge 1521 was running on

  • Java 8 Update 51 (64bit version) and that

  • 2 additional mods were installed

    • SpongeForge 1.8-1499-2.1DEV-575 (which is build #575) and
    • Core

Note

Please note that the other three installed mods (mcp, FML, Forge) are required on every Forge server and necessary to run properly.

Now the following assumptions can be made:

  • maybe the plugin crashed the server
  • SpongeForge doesn’t match the Forge version: 1499 required, 1521 installed

If you want to know how to solve this, head over to our checklist on the Debugging page.

Common errors

Head over to Debugging to read about common errors and exceptions.