Minecraft 1.12.2 VersionManifest for custom launchers to fix MacOS issues.

README.md

Customized versionManifest for Minecraft 1.12.2 to resolve problems on macOS.

Caused by: java.lang.ClassNotFoundException: ca.weblite.objc.NSObject
	at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	... 19 more

See:

• https://bugs.mojang.com/browse/MC-115725
• https://bugs.mojang.com/browse/MC-118506
• SKCraft/Launcher#205
• MinecraftForge/MinecraftForge#3964

Forge resolves this issues by using the ca.weblite:java-objc-bridge:1.0.0 (univarsal) from maven central instead from mojang maven. See: MinecraftForge/ForgeGradle#424

The patched versionManifest remove the natives for osx and link the required library to the maven central.

I'm build and distribute my modpack via SKCraft's Laucher. You can put the file manifest.json below on the same level where your modpack.json is. Then you have to add the parameter --version-file as launch option to the ModPack builder. Since I'm building my modpack headless and automated via GitLab CI and Jenkins, I don't have the idea howto get this on the GUI.

Example:

java -jar launcher-builder.jar --version-file manifest.json

manifest.json

{
  "assetIndex": {
    "id": "1.12",
    "sha1": "3b666765bafa02e84e24b371d9efd7a4d1b6e188",
    "size": 169254,
    "url": "https://launchermeta.mojang.com/mc/assets/1.12/3b666765bafa02e84e24b371d9efd7a4d1b6e188/1.12.json",
    "totalSize": 127589960
  },
  "assets": "1.12",
  "downloads": {
    "client": {
      "sha1": "0f275bc1547d01fa5f56ba34bdc87d981ee12daf",
      "size": 10180113,
      "url": "https://launcher.mojang.com/mc/game/1.12.2/client/0f275bc1547d01fa5f56ba34bdc87d981ee12daf/client.jar"
    },
    "server": {
      "sha1": "886945bfb2b978778c3a0288fd7fab09d315b25f",
      "size": 30222121,
      "url": "https://launcher.mojang.com/mc/game/1.12.2/server/886945bfb2b978778c3a0288fd7fab09d315b25f/server.jar"
    }
  },
  "id": "1.12.2",
  "libraries": [
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          "url": "https://libraries.minecraft.net/com/mojang/patchy/1.1/patchy-1.1.jar"
        }
      }
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          "url": "https://libraries.minecraft.net/oshi-project/oshi-core/1.1/oshi-core-1.1.jar"
        }
      }
    },
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}

Could u go into more detail please?