Minecraft Does Not Launch when Testing From Eclipse (1.12)

[ColdComfort]

Hi guys,

When I try to run my mod to test that I have my Eclipse environment set up correctly, it gets to the line "LWJGL Version: 2.9.4", and then just hangs indefinitely. The Minecraft client never launches, and I don't see any errors that seem like they would cause this. (I looked them up, and people seemed to say the WindowsAnsiOutputStream errors are audio-related, and should not impact anything beyond that.)

Anyone seen this before? Any help would be greatly appreciated! I've been trying to get this to work for hours, and I'm out of ideas for things to try.

 

2017-12-16 12:31:10,092 main WARN Unable to instantiate org.fusesource.jansi.WindowsAnsiOutputStream
2017-12-16 12:31:10,095 main WARN Unable to instantiate org.fusesource.jansi.WindowsAnsiOutputStream
[12:31:10] [main/INFO] [GradleStart]: username: [email protected]
[12:31:10] [main/INFO] [GradleStart]: Extra: []
[12:31:10] [main/INFO] [GradleStart]: Password found, attempting login
[12:31:10] [main/INFO]: Logging in with username & password
[12:31:12] [main/INFO] [GradleStart]: Login Succesful!
[12:31:12] [main/INFO] [GradleStart]: Running with arguments: [--userProperties, [], --assetsDir, C:/Users/ColdComfort/.gradle/caches/minecraft/assets, --assetIndex, 1.12, --userType, mojang, --accessToken{REDACTED}, --version, 1.12.2, --uuid, 80846a3049fe414987f45fe9198177b4, --username, ColdComfort, --tweakClass, net.minecraftforge.fml.common.launcher.FMLTweaker, --tweakClass, net.minecraftforge.gradle.tweakers.CoremodTweaker]
[12:31:12] [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLTweaker
[12:31:12] [main/INFO] [LaunchWrapper]: Using primary tweak class name net.minecraftforge.fml.common.launcher.FMLTweaker
[12:31:12] [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.gradle.tweakers.CoremodTweaker
[12:31:12] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLTweaker
[12:31:12] [main/INFO] [FML]: Forge Mod Loader version 14.23.1.2555 for Minecraft 1.12.2 loading
[12:31:12] [main/INFO] [FML]: Java is Java HotSpot(TM) 64-Bit Server VM, version 1.8.0_152, running on Windows 10:amd64:10.0, installed at C:\Program Files\Java\jre1.8.0_152
[12:31:12] [main/INFO] [FML]: Managed to load a deobfuscated Minecraft name- we are in a deobfuscated environment. Skipping runtime deobfuscation
[12:31:12] [main/INFO] [FML]: Ignoring missing certificate for coremod FMLCorePlugin (net.minecraftforge.fml.relauncher.FMLCorePlugin), we are in deobf and it's a forge core plugin
[12:31:12] [main/INFO] [FML]: Ignoring missing certificate for coremod FMLForgePlugin (net.minecraftforge.classloading.FMLForgePlugin), we are in deobf and it's a forge core plugin
[12:31:12] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.gradle.tweakers.CoremodTweaker
[12:31:12] [main/INFO] [GradleStart]: Injecting location in coremod net.minecraftforge.fml.relauncher.FMLCorePlugin
[12:31:12] [main/INFO] [GradleStart]: Injecting location in coremod net.minecraftforge.classloading.FMLForgePlugin
[12:31:12] [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLInjectionAndSortingTweaker
[12:31:12] [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLDeobfTweaker
[12:31:12] [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.gradle.tweakers.AccessTransformerTweaker
[12:31:12] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLInjectionAndSortingTweaker
[12:31:12] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLInjectionAndSortingTweaker
[12:31:12] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
2017-12-16 12:31:12,625 main WARN Unable to instantiate org.fusesource.jansi.WindowsAnsiOutputStream
2017-12-16 12:31:13,007 main WARN Unable to instantiate org.fusesource.jansi.WindowsAnsiOutputStream
2017-12-16 12:31:13,009 main WARN Unable to instantiate org.fusesource.jansi.WindowsAnsiOutputStream
[12:31:14] [main/ERROR] [FML]: FML appears to be missing any signature data. This is not a good thing
[12:31:14] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
[12:31:14] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLDeobfTweaker
[12:31:15] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.gradle.tweakers.AccessTransformerTweaker
[12:31:15] [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.fml.common.launcher.TerminalTweaker
[12:31:15] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.TerminalTweaker
[12:31:15] [main/INFO] [LaunchWrapper]: Launching wrapped minecraft {net.minecraft.client.main.Main}
[12:31:16] [main/INFO]: Setting user: ColdComfort
[12:31:21] [main/INFO]: LWJGL Version: 2.9.4

 

[jeffryfisher]

IIRC, LWJGL =  LightWeight Java Game Library

 

Are you missing LWJGL or a DLL it needs? But it should have emitted an error if that were so...

 

Maybe there's a version mismatch. Did you install on top of an earlier (or worse, a later) version of Forge?

 

I think you showed us console output. Have you dug up the actual log files? They contain more gruesome detail, so there might be a further clue.

[ColdComfort]

Hi Jeffryfisher,

Thanks for your help with this! I managed to get it sorted out.

Looking at the dependencies listed in Eclipse (specifically LWJGL), they didn't match what I had installed on my system when I looked at the path they were referencing. I think I had a fundamental misunderstanding of how the decomp workspace was set up, in that I didn't realize that it installed files in locations other than the workspace directory.

 

I ended up deleting the .gradle and .minecraft folders in my Windows User directory, and re-running the workspace setup to download the dependencies, re-downloaded Minecraft, and then re-installed Forge.

Now it works! Thanks again.