Jump to content

[1.8 - 1.10.2] Reliable way to get the launched Minecraft Version


Recommended Posts



I am using analytics for a mod of mine, and I need to get launched Minecraft version (e.g. "1.8", "1.10.2").


When using


, it returns (in the case of Forge) for example


. This is useful, as I can extract the version number out of this using Regex or equivalent.


However, there are modloaders, such as MultiMC5. When playing Minecraft via MultiMC5, it sets the Minecraft version to "MultiMC5", and you can't extract data out of that.


There is another way, and that is using either




(they are the same thing).


But here is the problem, this variable is not present at the


That variable is present, but incorrect. Read "EDIT 2", and I need this variable to be set/accessible when it is initializing. Due to other reasons, (EDIT 2) the detection has to be done before messages can be send to the player.


Is there another way to get the launched Minecraft version? Or is there another event that happens between the initialization and the player joining a server/world? I tried to use FMLPostInitializationEvent, but that crashed the entire client for some reason. Read "EDIT 2".


Thanks in advance,





This also happens when I am in-game:




Might as well add the (most likely) reason why this happens:

I am trying to make a universal mod, so one that supports 1.8 to 1.10.2. Some classes and functions change with the Minecraft Forge version, but I got that covered using reflection. When it fails to detect what version it is, it breaks down.



I am positive that there is a way to get the Minecraft version. Even the debug menu has it right:


Keep in mind that this is the same version/instance as the screenshot above.

Link to comment
Share on other sites

Be careful however: as this is a true constant the compiler will inline this field into your code, so your code will continue to run with the value that was there when you built your mod. If you e.g. compile your mod with 1.9.4 and then run it on 1.10.2 (yes, that works most of the time) your mod will still see 1.9.4 as the value for that field.

You have to resort to reading the value via reflection (or a classfile written by something other than javac) if you want the true runtime value.

In what class can I find the 'true runtime value'? I'm not sure where to look, and I can use reflection.



I found the




, and it looks like such:


This means that in the Minecraft version, the version is hardcoded.

This should not be a problem, as I can use Reflection to call this protected



Is this the right way to do it, or might there be an easier way? Thanks in advance.



I don't have any experience with creating core-mods, so how can I find out what the


method gets mapped to? Any tutorial?

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Unfortunately, your content contains terms that we do not allow. Please edit your content to remove the highlighted words below.
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


  • Recently Browsing

    • No registered users viewing this page.
  • Posts

    • I had a similar issue to what you do above. Given this is an old post, you've probably sorted this now In my case, I had Java (JDK) 22 installed. After uninstalling that and installing 17.0.11 (having both installed gives the same error), then running the startserver.bat worked for me. I managed to get to the EULA section and then start my server correctly- I hope it helps anyone else who may have this issue!
    • Make a test with another Launcher like MultiMC, AT Launcher or Technic Launcher
    • I opened up Minecraft today for the first time in a month and whenever I try and play forge I get an error 1 message. I restarted my computer, tried reinstalling both Minecraft and Forge and have updated all of my drivers. Nothing seems to work so I'm stumped. I have absolutely no mods installed ATM so I have no idea what could be causing the problem. I hope yall are able to help.   DebugLog:   [19May2024 20:33:51.600] [main/INFO] [cpw.mods.modlauncher.Launcher/MODLAUNCHER]: ModLauncher running: args [--username, dmoy18, --version, 1.20.1-forge-47.2.0, --gameDir, C:\Users\dmoyf\AppData\Roaming\.minecraft, --assetsDir, C:\Users\dmoyf\AppData\Roaming\.minecraft\assets, --assetIndex, 5, --uuid, c083972cd92d4dd2894beb25b82ebe82, --accessToken, ????????, --clientId, MDljMzIwMjYtOTJiNS00YWUxLTk1M2EtN2ExMGExZWM0MDAw, --xuid, 2535417310772497, --userType, msa, --versionType, release, --quickPlayPath, C:\Users\dmoyf\AppData\Roaming\.minecraft\quickPlay\java\1716168829421.json, --launchTarget, forgeclient, --fml.forgeVersion, 47.2.0, --fml.mcVersion, 1.20.1, --fml.forgeGroup, net.minecraftforge, --fml.mcpVersion, 20230612.114412] [19May2024 20:33:51.604] [main/INFO] [cpw.mods.modlauncher.Launcher/MODLAUNCHER]: ModLauncher 10.0.9+10.0.9+main.dcd20f30 starting: java version 17.0.8 by Microsoft; OS Windows 11 arch amd64 version 10.0 [19May2024 20:33:51.634] [main/DEBUG] [cpw.mods.modlauncher.LaunchServiceHandler/MODLAUNCHER]: Found launch services [fmlclientdev,forgeclient,minecraft,forgegametestserverdev,fmlserveruserdev,fmlclient,fmldatauserdev,forgeserverdev,forgeserveruserdev,forgeclientdev,forgeclientuserdev,forgeserver,forgedatadev,fmlserver,fmlclientuserdev,fmlserverdev,forgedatauserdev,testharness,forgegametestserveruserdev] [19May2024 20:33:51.653] [main/DEBUG] [cpw.mods.modlauncher.NameMappingServiceHandler/MODLAUNCHER]: Found naming services : [srgtomcp] [19May2024 20:33:51.668] [main/DEBUG] [cpw.mods.modlauncher.LaunchPluginHandler/MODLAUNCHER]: Found launch plugins: [mixin,eventbus,slf4jfixer,object_holder_definalize,runtime_enum_extender,capability_token_subclass,accesstransformer,runtimedistcleaner] [19May2024 20:33:51.681] [main/DEBUG] [cpw.mods.modlauncher.TransformationServicesHandler/MODLAUNCHER]: Discovering transformation services [19May2024 20:33:51.688] [main/DEBUG] [net.minecraftforge.fml.loading.FMLPaths/CORE]: Path GAMEDIR is C:\Users\dmoyf\AppData\Roaming\.minecraft [19May2024 20:33:51.689] [main/DEBUG] [net.minecraftforge.fml.loading.FMLPaths/CORE]: Path MODSDIR is C:\Users\dmoyf\AppData\Roaming\.minecraft\mods [19May2024 20:33:51.689] [main/DEBUG] [net.minecraftforge.fml.loading.FMLPaths/CORE]: Path CONFIGDIR is C:\Users\dmoyf\AppData\Roaming\.minecraft\config [19May2024 20:33:51.689] [main/DEBUG] [net.minecraftforge.fml.loading.FMLPaths/CORE]: Path FMLCONFIG is C:\Users\dmoyf\AppData\Roaming\.minecraft\config\fml.toml
  • Topics

  • Create New...

Important Information

By using this site, you agree to our Terms of Use.