1.20.1 Error when i launch my minecraft 1.2O.1 with forge

[Dafaba]

hi everyone, when i launch mc 1.20.1 with forge i get this error [22:53:57] [main/ERROR] [cp.mo.mo.TransformationServiceDecorator/MODLAUNCHER]: Service failed to load fml 
i tried with 2 versions of forge, 47.0.3 and 47.0.19 and because i think it comes from java this is my version of java :
Version 8 Update 301 build 1.8.0_301-b09
Copyright 2021
I read it in app about java 

I dont have this error with the 1.2O.1 vanilla and with 1.19.2 forge

[Tempak]

Same issue with Forge for 1.20 and 1.20.1. It works fine for 1.19.4, and older.

I did install forge-1.20.1-47.0.35-installer.jar, and got following exception while running game using 1.20.1-forge-47.0.35 profile:

[00:32:18] [main/INFO] [cp.mo.mo.Launcher/MODLAUNCHER]: ModLauncher running: args [--username, xxx, --version, 1.20.1-forge-47.0.35, --gameDir, C:\Users\xxx\AppData\Roaming\.minecraft, --assetsDir, C:\Users\xxx\AppData\Roaming\.minecraft\assets, --assetIndex, 5, --uuid, 11111111111111111111111111111111, --accessToken, ????????, --clientId, ${clientid}, --xuid, ${auth_xuid}, --userType, legacy, --versionType, release, --launchTarget, forgeclient, --fml.forgeVersion, 47.0.35, --fml.mcVersion, 1.20.1, --fml.forgeGroup, net.minecraftforge, --fml.mcpVersion, 20230612.114412]
[00:32:18] [main/INFO] [cp.mo.mo.Launcher/MODLAUNCHER]: ModLauncher 10.0.9+10.0.9+main.dcd20f30 starting: java version 17.0.7 by Eclipse Adoptium; OS Windows 10 arch amd64 version 10.0
[00:32:18] [main/FATAL] [cp.mo.mo.LaunchPluginHandler/MODLAUNCHER]: Encountered serious error loading launch plugin service. Things will not work well
java.util.ServiceConfigurationError: cpw.mods.modlauncher.serviceapi.ILaunchPluginService: Provider net.minecraftforge.fml.loading.RuntimeDistCleaner could not be instantiated
	at java.util.ServiceLoader.fail(ServiceLoader.java:586) ~[?:?] {}
	at java.util.ServiceLoader$ProviderImpl.newInstance(ServiceLoader.java:813) ~[?:?] {}
	at java.util.ServiceLoader$ProviderImpl.get(ServiceLoader.java:729) ~[?:?] {}
	at cpw.mods.modlauncher.util.ServiceLoaderUtils.lambda$streamWithErrorHandling$0(ServiceLoaderUtils.java:39) ~[modlauncher-10.0.9.jar:?] {}
	at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197) ~[?:?] {}
	at java.util.ServiceLoader$ProviderSpliterator.tryAdvance(ServiceLoader.java:1499) ~[?:?] {}
	at java.util.Spliterator.forEachRemaining(Spliterator.java:332) ~[?:?] {}
	at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509) ~[?:?] {}
	at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499) ~[?:?] {}
	at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:921) ~[?:?] {}
	at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[?:?] {}
	at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:682) ~[?:?] {}
	at cpw.mods.modlauncher.LaunchPluginHandler.<init>(LaunchPluginHandler.java:46) ~[modlauncher-10.0.9.jar:?] {}
	at cpw.mods.modlauncher.Launcher.<init>(Launcher.java:65) ~[modlauncher-10.0.9.jar:?] {}
	at cpw.mods.modlauncher.Launcher.main(Launcher.java:78) ~[modlauncher-10.0.9.jar:?] {}
	at cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:26) ~[modlauncher-10.0.9.jar:?] {}
	at cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:23) ~[modlauncher-10.0.9.jar:?] {}
	at cpw.mods.bootstraplauncher.BootstrapLauncher.main(BootstrapLauncher.java:141) ~[bootstraplauncher-1.1.2.jar:?] {}
Caused by: java.lang.NoClassDefFoundError: net/minecraftforge/api/distmarker/OnlyIn
	at net.minecraftforge.fml.loading.RuntimeDistCleaner.<clinit>(RuntimeDistCleaner.java:42) ~[fmlloader-1.20.1-47.0.35.jar%2380!/:1.0] {}
	at jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:?] {}
	at jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:77) ~[?:?] {}
	at jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:?] {}
	at java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:499) ~[?:?] {}
	at java.lang.reflect.Constructor.newInstance(Constructor.java:480) ~[?:?] {}
	at java.util.ServiceLoader$ProviderImpl.newInstance(ServiceLoader.java:789) ~[?:?] {}
	... 16 more
Caused by: java.lang.ClassNotFoundException: net.minecraftforge.api.distmarker.OnlyIn
	at jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:641) ~[?:?] {}
	at java.lang.ClassLoader.loadClass(ClassLoader.java:520) ~[?:?] {}
	at cpw.mods.cl.ModuleClassLoader.loadClass(ModuleClassLoader.java:137) ~[securejarhandler-2.1.10.jar:?] {}
	at java.lang.ClassLoader.loadClass(ClassLoader.java:520) ~[?:?] {}
	at net.minecraftforge.fml.loading.RuntimeDistCleaner.<clinit>(RuntimeDistCleaner.java:42) ~[fmlloader-1.20.1-47.0.35.jar%2380!/:1.0] {}
	at jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:?] {}
	at jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:77) ~[?:?] {}
	at jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:?] {}
	at java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:499) ~[?:?] {}
	at java.lang.reflect.Constructor.newInstance(Constructor.java:480) ~[?:?] {}
	at java.util.ServiceLoader$ProviderImpl.newInstance(ServiceLoader.java:789) ~[?:?] {}
	... 16 more
[00:32:18] [main/INFO] [ne.mi.fm.lo.ImmediateWindowHandler/]: Loading ImmediateWindowProvider fmlearlywindow
[00:32:19] [main/INFO] [EARLYDISPLAY/]: Trying GL version 4.6
[00:32:19] [main/INFO] [EARLYDISPLAY/]: Requested GL version 4.6 got version 4.6
[00:32:19] [main/ERROR] [ne.mi.fm.lo.FMLLoader/CORE]: Dist Cleaner is missing, we need this to run
[00:32:19] [main/ERROR] [cp.mo.mo.TransformationServiceDecorator/MODLAUNCHER]: Service failed to load fml
cpw.mods.modlauncher.api.IncompatibleEnvironmentException: Missing DistCleaner, cannot run!
	at net.minecraftforge.fml.loading.FMLLoader.lambda$onInitialLoad$2(FMLLoader.java:94) ~[fmlloader-1.20.1-47.0.35.jar:1.0] {}
	at java.util.Optional.orElseThrow(Optional.java:403) ~[?:?] {}
	at net.minecraftforge.fml.loading.FMLLoader.onInitialLoad(FMLLoader.java:92) ~[fmlloader-1.20.1-47.0.35.jar:1.0] {}
	at net.minecraftforge.fml.loading.FMLServiceProvider.onLoad(FMLServiceProvider.java:100) ~[fmlloader-1.20.1-47.0.35.jar:1.0] {}
	at cpw.mods.modlauncher.TransformationServiceDecorator.onLoad(TransformationServiceDecorator.java:53) ~[modlauncher-10.0.9.jar:?] {}
	at cpw.mods.modlauncher.TransformationServicesHandler.lambda$loadTransformationServices$11(TransformationServicesHandler.java:116) ~[modlauncher-10.0.9.jar:?] {}
	at java.util.HashMap$Values.forEach(HashMap.java:1065) ~[?:?] {}
	at cpw.mods.modlauncher.TransformationServicesHandler.loadTransformationServices(TransformationServicesHandler.java:116) ~[modlauncher-10.0.9.jar:?] {}
	at cpw.mods.modlauncher.TransformationServicesHandler.initializeTransformationServices(TransformationServicesHandler.java:48) ~[modlauncher-10.0.9.jar:?] {}
	at cpw.mods.modlauncher.Launcher.run(Launcher.java:88) ~[modlauncher-10.0.9.jar:?] {}
	at cpw.mods.modlauncher.Launcher.main(Launcher.java:78) ~[modlauncher-10.0.9.jar:?] {}
	at cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:26) ~[modlauncher-10.0.9.jar:?] {}
	at cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:23) ~[modlauncher-10.0.9.jar:?] {}
	at cpw.mods.bootstraplauncher.BootstrapLauncher.main(BootstrapLauncher.java:141) ~[bootstraplauncher-1.1.2.jar:?] {}
[00:32:19] [main/ERROR] [cp.mo.mo.TransformationServicesHandler/MODLAUNCHER]: Found 1 services that failed to load : [fml]
Exception in thread "main" cpw.mods.modlauncher.InvalidLauncherSetupException: Invalid Services found fml
	at MC-BOOTSTRAP/[email protected]/cpw.mods.modlauncher.TransformationServicesHandler.validateTransformationServices(TransformationServicesHandler.java:110)
	at MC-BOOTSTRAP/[email protected]/cpw.mods.modlauncher.TransformationServicesHandler.initializeTransformationServices(TransformationServicesHandler.java:49)
	at MC-BOOTSTRAP/[email protected]/cpw.mods.modlauncher.Launcher.run(Launcher.java:88)
	at MC-BOOTSTRAP/[email protected]/cpw.mods.modlauncher.Launcher.main(Launcher.java:78)
	at MC-BOOTSTRAP/[email protected]/cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:26)
	at MC-BOOTSTRAP/[email protected]/cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:23)
	at [email protected]/cpw.mods.bootstraplauncher.BootstrapLauncher.main(BootstrapLauncher.java:141)

I found that missing class file "java.lang.NoClassDefFoundError: net/minecraftforge/api/distmarker/OnlyIn" is now included in mergetool-x.x.x-api.jar instead of forgespi-x.x.x.jar for 1.19.x.
What I did was locate merge tool version used by forge looking into Forge profile config file:

%APPDATA%\.minecraft\versions\1.20.1-forge-47.0.35\1.20.1-forge-47.0.35.json

and searching for "mergetool" string, then it's path attribute:

"path": "net/minecraftforge/mergetool/1.1.5/mergetool-1.1.5-api.jar"

Then I added this to java modules path within same 1.20.1-forge-47.0.35.json file, within "jvm" as first module next to "-p" parameter:

Before change:

            "-p",
            "${library_directory}/cpw/mods/bootstraplauncher/1.1.2/bootstraplauncher-1.1.2.jar${classpath_separator}.....

After change:

            "-p",
            "${library_directory}/net/minecraftforge/mergetool/1.1.5/mergetool-1.1.5-api.jar${classpath_separator}${library_directory}/cpw/mods/bootstraplauncher/1.1.2/bootstraplauncher-1.1.2.jar${classpath_separator}.....

It works, but I don't know why this library is not included into forge json config file by Forge installer by default.

Maybe some launchers are including all libraries from %APPDATA%\.minecraft\libraries\ into classpath, but others not.

 

Edited July 11, 2023 by Tempak

[LexManos]

It very much is included in the installer, so not sure what you're getting at.

Make sure you are using the vanilla mojang's launcher. Also this isn't the same issue as the OP because OP hasn't posted his logs so we dont know what his issue actually is.

[Tempak]

I'm sure that he faced same issue, but quoted only part of the log. It's because I used non vanilla 3rd party launcher, which does not include all required dependecies in class path. There is no issue using latest genuine vanilla launcher.

So my workaround may help for someone who is trying to use different or maybe outdated launcher.

I just compared command line from my launcher and vanilla one, and I found that indeed part of libraries are not listed in classpath, not only mergetool.
In my case following are missing:

libraries\net\minecraftforge\mergetool\1.1.5\mergetool-1.1.5-api.jar
libraries\com\mojang\patchy\2.2.10\patchy-2.2.10.jar
libraries\org\lwjgl\lwjgl-glfw\3.3.1\lwjgl-glfw-3.3.1-natives-windows.jar
libraries\org\lwjgl\lwjgl-glfw\3.3.1\lwjgl-glfw-3.3.1-natives-windows-arm64.jar
libraries\org\lwjgl\lwjgl-glfw\3.3.1\lwjgl-glfw-3.3.1-natives-windows-x86.jar
libraries\org\lwjgl\lwjgl-jemalloc\3.3.1\lwjgl-jemalloc-3.3.1-natives-windows.jar
libraries\org\lwjgl\lwjgl-jemalloc\3.3.1\lwjgl-jemalloc-3.3.1-natives-windows-arm64.jar
libraries\org\lwjgl\lwjgl-jemalloc\3.3.1\lwjgl-jemalloc-3.3.1-natives-windows-x86.jar
libraries\org\lwjgl\lwjgl-openal\3.3.1\lwjgl-openal-3.3.1-natives-windows.jar
libraries\org\lwjgl\lwjgl-openal\3.3.1\lwjgl-openal-3.3.1-natives-windows-arm64.jar
libraries\org\lwjgl\lwjgl-openal\3.3.1\lwjgl-openal-3.3.1-natives-windows-x86.jar
libraries\org\lwjgl\lwjgl-opengl\3.3.1\lwjgl-opengl-3.3.1-natives-windows.jar
libraries\org\lwjgl\lwjgl-opengl\3.3.1\lwjgl-opengl-3.3.1-natives-windows-arm64.jar
libraries\org\lwjgl\lwjgl-opengl\3.3.1\lwjgl-opengl-3.3.1-natives-windows-x86.jar
libraries\org\lwjgl\lwjgl-stb\3.3.1\lwjgl-stb-3.3.1-natives-windows.jar
libraries\org\lwjgl\lwjgl-stb\3.3.1\lwjgl-stb-3.3.1-natives-windows-arm64.jar
libraries\org\lwjgl\lwjgl-stb\3.3.1\lwjgl-stb-3.3.1-natives-windows-x86.jar
libraries\org\lwjgl\lwjgl-tinyfd\3.3.1\lwjgl-tinyfd-3.3.1-natives-windows.jar
libraries\org\lwjgl\lwjgl-tinyfd\3.3.1\lwjgl-tinyfd-3.3.1-natives-windows-arm64.jar
libraries\org\lwjgl\lwjgl-tinyfd\3.3.1\lwjgl-tinyfd-3.3.1-natives-windows-x86.jar
libraries\org\lwjgl\lwjgl\3.3.1\lwjgl-3.3.1-natives-windows.jar
libraries\org\lwjgl\lwjgl\3.3.1\lwjgl-3.3.1-natives-windows-arm64.jar
libraries\org\lwjgl\lwjgl\3.3.1\lwjgl-3.3.1-natives-windows-x86.jar

So this issue is not related to vanilla launcher at all, it's not Forge installer fault.
It's 3rd party launcher failure, which can be workarounded by adding missing dependencies to class path manually if someone really want to stick with non-vanilla launcher.

Edited July 12, 2023 by Tempak

[PengSeal]

I encounter same issues and I'm using a vanilla launcher...

[Paint_Ninja]

Forge 1.20.1 requires Java 17