MCP919-Gradle

What is this?

This is a ready-to-run vanilla Minecraft 1.8.9 client. It uses Gradle to manage dependencies and build. It is completely safe and vanilla, I didn't modify any of the code, you can add your own modifications and build your own client. If you want to decompile Minecraft 1.8.9 and set up it with Gradle like me, go to How to create this myself section.

How to run

Copy the repository first.

In order to run Minecraft, You should add a run configurationin Intellij IDEA. Choose application and type in the main class Start, then you add a VM Option (alt+v): -Djava.library.path=..\natives and set working directory to run, you might also need to specify the classpath to the main one.

After all these, you should get a run configuration looks like this.

And you can finally run the client.

How to export?

Just use gradle to build this project and you'll find the jar file under build\libs. Keep in mind that the jar file you produce isn't obfuscated.

How to create this myself?

1. Download mcp918.zip from MCP Official Website.

2. You extract it into any folder (we call this folder mcp in this passage) and change versions in mcp\conf\version.cfg to 1.8.9.

   
   

   You then download mcp_stable_nodoc-22-1.8.9.zip and mcp-1.8.9-srg.zip from MCPMappingsArchive (located under mcp_stable_nodoc/22-1.8.9/mcp_stable_nodoc-22-1.8.9.zip and mcp/1.8.9) and extract them all into mcp\conf, overwriting all the original files.

3. You go back to mcp and run decompile.bat (make sure you've ran Minecraft at least once so that you have all the assets file in %APPDATA%\.minecraft).

4. Then, there should be an error when MCP tries to recompile Minecraft. Don't worry, you can fix it by changing codes in mcp\src\minecraft\net\minecraft\world\gen\structure\StructureMineshaftPieces.java from

   for (lvt_5_1_ = 0; k < this.boundingBox.getXSize(); k = k + 4)
   

   to

   for (int k = 0; k < this.boundingBox.getXSize(); k = k + 4)
   

   Then, you've successfully fixed the error!

5. Next, you create a new Gradle project in Intellij IDEA and there should be a src\main\java directory in your project root directory, copy all the decompiled and deobfuscated Minecraft code (mcp\src\minecraft) into this directory.

6. Minecraft still can't run without its libraries and assets, so we're going to add them to our Gradle project.

   
   

   First, we create a run folder, a natives folder, a libs folder under project root directory.

   
   

   Copy all the .jar files from mcp\jars\libraries to project\libs and add these lines to your Gradle build.gradle:

   dependencies {
       implementation fileTree('libs')
   }
   

   After that, you copy all the natives file from mcp\jars\versions\1.8.8\1.8.8-natives to project\natives.

   
   

   Next, we locate jars\versions\1.8.9\1.8.9.jar and open it as a zip file, copy assets, log4j2.xml and pack.png to project\src\main\resources. Then, we go back to mcp\jars and copy the assets folder to mcp\run.

7. Lastly, if you followed all these steps, you should have set up a runnable vanilla minecraft 1.8.9 client with Gradle. You just simply follow the guide from How to run and you'll be able to run this client.