So in my IntelliJ environment's src/mods directory, just for testing (I know this isn't the right way to go about adding other mods as soft dependencies) I added JEI's latest jar file to it, but the game crashes because that mod doesn't load correctly.

I know this is caused by two mods having different mapping versions, i.e. if I have a snapshot version of some 1.16.3 mapper whereas the other mod has a mapper for 1.16.5. But my question is, will this issue remain even after I add my mod's .JAR  to a non-dev environment?

---- Minecraft Crash Report ----
// Sorry :(

Time: 4/18/21 9:44 AM
Description: Mod loading error has occurred

java.lang.Exception: Mod Loading has failed
	at net.minecraftforge.fml.CrashReportExtender.dumpModLoadingCrashReport(CrashReportExtender.java:85) ~[forge-1.16.5-36.0.46_mapped_snapshot_20201028-1.16.3-recomp.jar:?] {re:classloading}
	at net.minecraftforge.fml.client.ClientModLoader.completeModLoading(ClientModLoader.java:188) ~[forge-1.16.5-36.0.46_mapped_snapshot_20201028-1.16.3-recomp.jar:?] {re:classloading,pl:runtimedistcleaner:A}
	at net.minecraft.client.Minecraft.lambda$null$1(Minecraft.java:513) ~[forge-1.16.5-36.0.46_mapped_snapshot_20201028-1.16.3-recomp.jar:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
	at net.minecraft.util.Util.acceptOrElse(Util.java:323) ~[forge-1.16.5-36.0.46_mapped_snapshot_20201028-1.16.3-recomp.jar:?] {re:classloading}
	at net.minecraft.client.Minecraft.lambda$new$2(Minecraft.java:509) ~[forge-1.16.5-36.0.46_mapped_snapshot_20201028-1.16.3-recomp.jar:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
	at net.minecraft.client.gui.ResourceLoadProgressGui.render(ResourceLoadProgressGui.java:113) ~[forge-1.16.5-36.0.46_mapped_snapshot_20201028-1.16.3-recomp.jar:?] {re:classloading,pl:runtimedistcleaner:A}
	at net.minecraft.client.renderer.GameRenderer.updateCameraAndRender(GameRenderer.java:493) ~[forge-1.16.5-36.0.46_mapped_snapshot_20201028-1.16.3-recomp.jar:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
	at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:1002) ~[forge-1.16.5-36.0.46_mapped_snapshot_20201028-1.16.3-recomp.jar:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
	at net.minecraft.client.Minecraft.run(Minecraft.java:612) ~[forge-1.16.5-36.0.46_mapped_snapshot_20201028-1.16.3-recomp.jar:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
	at net.minecraft.client.main.Main.main(Main.java:184) ~[forge-1.16.5-36.0.46_mapped_snapshot_20201028-1.16.3-recomp.jar:?] {re:classloading,pl:runtimedistcleaner:A}
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_241] {}
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_241] {}
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_241] {}
	at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_241] {}
	at net.minecraftforge.userdev.FMLUserdevClientLaunchProvider.lambda$launchService$0(FMLUserdevClientLaunchProvider.java:52) ~[forge-1.16.5-36.0.46_mapped_snapshot_20201028-1.16.3-recomp.jar:?] {}
	at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37) [modlauncher-8.0.9.jar:?] {}
	at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:54) [modlauncher-8.0.9.jar:?] {}
	at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:72) [modlauncher-8.0.9.jar:?] {}
	at cpw.mods.modlauncher.Launcher.run(Launcher.java:82) [modlauncher-8.0.9.jar:?] {}
	at cpw.mods.modlauncher.Launcher.main(Launcher.java:66) [modlauncher-8.0.9.jar:?] {}
	at net.minecraftforge.userdev.LaunchTesting.main(LaunchTesting.java:105) [forge-1.16.5-36.0.46_mapped_snapshot_20201028-1.16.3-recomp.jar:?] {}


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

-- Head --
Thread: Render thread
Stacktrace:
	at mezz.jei.config.ModIdFormattingConfig.parseFriendlyModNameFormat(ModIdFormattingConfig.java:111) ~[jei:7.6.4.88] {re:classloading}
-- MOD jei --
Details:
	Mod File: jei-1.16.5-7.6.4.88.jar
	Failure message: Just Enough Items (jei) has failed to load correctly
		java.lang.NoSuchMethodError: net.minecraft.util.text.TextFormatting.func_96300_b(Ljava/lang/String;)Lnet/minecraft/util/text/TextFormatting;
	Mod Version: 7.6.4.88
	Mod Issue URL: https://github.com/mezz/JustEnoughItems/issues?q=is%3Aissue
	Exception message: java.lang.NoSuchMethodError: net.minecraft.util.text.TextFormatting.func_96300_b(Ljava/lang/String;)Lnet/minecraft/util/text/TextFormatting;
Stacktrace:
	at mezz.jei.config.ModIdFormattingConfig.parseFriendlyModNameFormat(ModIdFormattingConfig.java:111) ~[jei:7.6.4.88] {re:classloading}
	at mezz.jei.config.ModIdFormattingConfig.<init>(ModIdFormattingConfig.java:35) ~[jei:7.6.4.88] {re:classloading}
	at mezz.jei.config.JEIClientConfig.<clinit>(JEIClientConfig.java:24) ~[jei:7.6.4.88] {re:classloading}
	at mezz.jei.JustEnoughItems.clientStart(JustEnoughItems.java:32) ~[jei:7.6.4.88] {re:classloading}
	at mezz.jei.JustEnoughItems.lambda$null$0(JustEnoughItems.java:27) ~[jei:7.6.4.88] {re:classloading}
	at net.minecraftforge.fml.DistExecutor.unsafeRunWhenOn(DistExecutor.java:125) ~[forge:?] {re:classloading}
	at net.minecraftforge.fml.DistExecutor.runWhenOn(DistExecutor.java:109) ~[forge:?] {re:classloading}
	at mezz.jei.JustEnoughItems.<init>(JustEnoughItems.java:27) ~[jei:7.6.4.88] {re:classloading}
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.8.0_241] {}
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[?:1.8.0_241] {}
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:1.8.0_241] {}
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[?:1.8.0_241] {}
	at java.lang.Class.newInstance(Class.java:442) ~[?:1.8.0_241] {}
	at net.minecraftforge.fml.javafmlmod.FMLModContainer.constructMod(FMLModContainer.java:81) ~[forge:36.0] {re:classloading}
	at net.minecraftforge.fml.ModContainer.lambda$buildTransitionHandler$4(ModContainer.java:120) ~[forge:?] {re:classloading}
	at java.util.concurrent.CompletableFuture$AsyncRun.run(CompletableFuture.java:1640) ~[?:1.8.0_241] {}
	at java.util.concurrent.CompletableFuture$AsyncRun.exec(CompletableFuture.java:1632) ~[?:1.8.0_241] {}
	at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289) ~[?:1.8.0_241] {}
	at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056) ~[?:1.8.0_241] {}
	at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1692) ~[?:1.8.0_241] {}
	at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157) ~[?:1.8.0_241] {}


-- System Details --
Details:
	Minecraft Version: 1.16.5
	Minecraft Version ID: 1.16.5
	Operating System: Windows 10 (amd64) version 10.0
	Java Version: 1.8.0_241, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 133789360 bytes (127 MB) / 1671954432 bytes (1594 MB) up to 3806855168 bytes (3630 MB)
	CPUs: 12
	JVM Flags: 1 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump
	ModLauncher: 8.0.9+86+master.3cf110c
	ModLauncher launch target: fmluserdevclient
	ModLauncher naming: mcp
	ModLauncher services: 
		/mixin-0.8.2.jar mixin PLUGINSERVICE 
		/eventbus-4.0.0.jar eventbus PLUGINSERVICE 
		/forge-1.16.5-36.0.46_mapped_snapshot_20201028-1.16.3-launcher.jar object_holder_definalize PLUGINSERVICE 
		/forge-1.16.5-36.0.46_mapped_snapshot_20201028-1.16.3-launcher.jar runtime_enum_extender PLUGINSERVICE 
		/accesstransformers-3.0.1.jar accesstransformer PLUGINSERVICE 
		/forge-1.16.5-36.0.46_mapped_snapshot_20201028-1.16.3-launcher.jar capability_inject_definalize PLUGINSERVICE 
		/forge-1.16.5-36.0.46_mapped_snapshot_20201028-1.16.3-launcher.jar runtimedistcleaner PLUGINSERVICE 
		/mixin-0.8.2.jar mixin TRANSFORMATIONSERVICE 
		/forge-1.16.5-36.0.46_mapped_snapshot_20201028-1.16.3-launcher.jar fml TRANSFORMATIONSERVICE 
	FML: 36.0
	Forge: net.minecraftforge:36.0.46
	FML Language Providers: 
		[email protected]
		minecraft@1
	Mod List: 
		client-extra.jar                                  |Minecraft                     |minecraft                     |1.16.5              |CREATE_REG|a1:d4:5e:04:4f:d3:d6:e0:7b:37:97:cf:77:b0:de:ad:4a:47:ce:8c:96:49:5f:0a:cf:8c:ae:b2:6d:4b:8a:3f
		forge-1.16.5-36.0.46_mapped_snapshot_20201028-1.16|Forge                         |forge                         |36.0.46             |CREATE_REG|NOSIGNATURE
		main                                              |Withernauts                   |withernauts                   |NONE                |CREATE_REG|NOSIGNATURE
		citadel-1.6.2-deobf.jar                           |Citadel                       |citadel                       |1.6.2               |CREATE_REG|NOSIGNATURE
		jei-1.16.5-7.6.4.88.jar                           |Just Enough Items             |jei                           |7.6.4.88            |ERROR     |NOSIGNATURE
	Crash Report UUID: 1104a884-1b05-49bb-a69a-24e21bda1651

 

Edited April 18, 20214 yr by Turtledove

Just now, diesieben07 said:

You need to use fg.deobf to deobfuscate mods to your local mappings.

Yeah that was my worry that this issue would still exist when my mod was deobfuscated, good to hear it won't. I just plonked down the other mod's file into my development directory's mod folder just for testing.