When loading Minecraft Forge 1.12.2 with this mod, the game hangs at the "constructing mods" screen.

The log doesn't seem to show any issues, but I will post the log anyways.

https://paste.atlauncher.com/view/ead6bc02-f9d2-42a0-a8f1-82b4842d3667

To replicate: Install HammerLib mod with Forge 1.12.2 or Install a 1.12.2 modpack that contains this mod.

Please remove all irrelevant mods. Leave out the forge and HammerLib, but nothing else, and see if anything changes.

Alright so, It appears to still have the issue.

Here's the log again if you need it:

Log: https://paste.atlauncher.com/view/00a6eebe-cc45-410b-9755-2ddee4a4ed1a

Either you provided incorrect logs, or there are a lot of mods still installed.

I would suggest using native minecraft launcher and see if that helps.

I tried CurseForge with just that mod. Same issue.

I could try the Native Launcher, but I'm pretty sure it would be the same.

Here's a copy and paste from the latest.log:

[14:15:37] [main/INFO]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLTweaker
[14:15:37] [main/INFO]: Using primary tweak class name net.minecraftforge.fml.common.launcher.FMLTweaker
[14:15:37] [main/INFO]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLTweaker
[14:15:37] [main/INFO]: Forge Mod Loader version 14.23.5.2860 for Minecraft 1.12.2 loading
[14:15:37] [main/INFO]: Java is Java HotSpot(TM) 64-Bit Server VM, version 1.8.0_51, running on Windows 10:amd64:10.0, installed at C:\Users\logan\curseforge\minecraft\Install\runtime\jre-legacy\windows-x64\jre-legacy
[14:15:37] [main/INFO]: Searching C:\Users\logan\curseforge\minecraft\Instances\HammerLib\mods for mods
[14:15:38] [main/WARN]: Found FMLCorePluginContainsFMLMod marker in HammerLib-1.12.2-12.2.38.jar. This is not recommended, @mods should be in a separate jar from the coremod.
[14:15:38] [main/INFO]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLInjectionAndSortingTweaker
[14:15:38] [main/INFO]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLDeobfTweaker
[14:15:38] [main/INFO]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLInjectionAndSortingTweaker
[14:15:38] [main/INFO]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLInjectionAndSortingTweaker
[14:15:38] [main/INFO]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
[14:15:39] [main/INFO]: Found valid fingerprint for Minecraft Forge. Certificate fingerprint e3c3d50c7c986df74c645c0ac54639741c90a557
[14:15:39] [main/INFO]: Found valid fingerprint for Minecraft. Certificate fingerprint cd99959656f753dc28d863b46769f7f8fbaefcfc
[14:15:39] [main/INFO]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
[14:15:39] [main/INFO]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
[14:15:39] [main/INFO]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLDeobfTweaker
[14:15:39] [main/INFO]: Loading tweak class name net.minecraftforge.fml.common.launcher.TerminalTweaker
[14:15:39] [main/INFO]: Calling tweak class net.minecraftforge.fml.common.launcher.TerminalTweaker
[14:15:39] [main/INFO]: Launching wrapped minecraft {net.minecraft.client.main.Main}
[14:15:40] [main/INFO]: Transforming net.minecraft.world.World (amu)...
[14:15:40] [main/INFO]: -Patching World
[14:15:40] [main/INFO]: -Modified method 'k', replaced nx.e()V with HC call.
[14:15:40] [main/INFO]: Transforming net.minecraft.entity.EntityLivingBase (vp)...
[14:15:40] [main/INFO]: -Patching EntityLivingBase
[14:15:40] [main/INFO]: -Modified method 'onItemUseFinish': added event call.
[14:15:40] [main/INFO]: Transforming net.minecraft.profiler.Profiler (rl)...
[14:15:40] [main/INFO]: -Patched startSection!
[14:15:40] [main/INFO]: -Patched endSection!
[14:15:40] [main/INFO]: -Patched endStartSection!
[14:15:40] [main/INFO]: Transforming net.minecraftforge.client.ForgeHooksClient (net.minecraftforge.client.ForgeHooksClient)...
[14:15:40] [main/INFO]: -Patched handleCameraTransforms!
[14:15:40] [Client thread/INFO]: Setting user: RaisinMuffin2
[14:15:41] [Client thread/INFO]: Transforming net.minecraft.entity.item.EntityItem (acl)...
[14:15:41] [Client thread/INFO]: -Patching EntityItem
[14:15:41] [Client thread/INFO]: -Modified method 'attackEntityFrom': added event call.
[14:15:43] [Client thread/INFO]: LWJGL Version: 2.9.4
[14:15:45] [Client thread/INFO]: Transforming net.minecraft.client.renderer.GlStateManager (bus)...
[14:15:45] [Client thread/INFO]: -Patched enableLighting!
[14:15:45] [Client thread/INFO]: -Patched disableLighting!
[14:15:45] [Client thread/INFO]: Could not load splash.properties, will create a default one
[14:15:45] [Client thread/INFO]: -- System Details --
Details:
Minecraft Version: 1.12.2
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: 764403696 bytes (728 MB) / 937426944 bytes (894 MB) up to 3817865216 bytes (3641 MB)
JVM Flags: 3 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx4096m -Xms256m
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
FML:
Loaded coremods (and transformers):
HCASM (HammerLib-1.12.2-12.2.38.jar)
com.zeitheron.hammercore.asm.HammerCoreTransformer
GL info: ' Vendor: 'NVIDIA Corporation' Version: '4.6.0 NVIDIA 537.42' Renderer: 'NVIDIA GeForce RTX 3070 Laptop GPU/PCIe/SSE2'
[14:15:47] [Client thread/INFO]: MinecraftForge v14.23.5.2860 Initialized
[14:15:47] [Client thread/INFO]: Starts to replace vanilla recipe ingredients with ore ingredients.
[14:15:47] [Client thread/INFO]: Invalid recipe found with multiple oredict ingredients in the same ingredient...
[14:15:47] [Client thread/INFO]: Replaced 1227 ore ingredients
[14:15:47] [Client thread/INFO]: Searching C:\Users\logan\curseforge\minecraft\Instances\HammerLib\mods for mods
[14:15:48] [Client thread/INFO]: Forge Mod Loader has identified 5 mods to load
[14:15:48] [Client thread/INFO]: Attempting connection with missing mods [minecraft, mcp, FML, forge, hammercore] at CLIENT
[14:15:48] [Client thread/INFO]: Attempting connection with missing mods [minecraft, mcp, FML, forge, hammercore] at SERVER
[14:15:49] [Thread-4/INFO]: Using sync timing. 200 frames of Display.update took 444330700 nanos

^ this was the last line before it froze.

Keep in mind, I don't have any other mods installed.

Yeah, I don't think there is anything I could do about it, sorry.