It's important to learn how to traverse the generate sources so that you can debug and get an understanding of the inner workings of Minecraft. Here we outline some common IDE usages.

Searching for a Minecraft Class

Once sources are generated. it should be possible for you to search or view Minecraft classes.

Viewing Class Definitions

Quick Open (Ctrl+P): Type # followed by the class name (e.g. #Identifier).

Go to Definition (F12): From source code, navigate to a class definition by Ctrl + clicking on its name, or by right-clicking it and selecting "Go to Definition".

Finding References

You can find all usages of a class by right-clicking on a class name and clicking Find All References.

INFO

If the functions above do not work as expected, it's likely that sources are not attached properly. This can generally be fixed by cleaning up the workspace cache.

• Click the Show Java Status Menu button in the status bar.

• In the menu that just opened, click Clean Workspace Cache... and confirm the operation.

• Close and reopen the project.

Viewing Bytecode

Viewing bytecode is necessary when writing mixins. However, Visual Studio Code lacks native support for bytecode viewing, and the few extensions which add it might not work.

In such case, you can use Java's inbuilt javap to view bytecode.

• Locate the path to Minecraft JAR:

  Open the Explorer view, expand the Java Projects section. Expand the Reference Libraries node in the project tree and locate a JAR with minecraft- in its name. Right-click on the JAR and copy the full path.

  It might look something like this:

  C:/project/.gradle/loom-cache/minecraftMaven/net/minecraft/minecraft-merged-503b555a3d/1.21.8-net.fabricmc.yarn.1_21_8.1.21.8+build.1-v2/minecraft-merged-503b555a3d-1.21.8-net.fabricmc.yarn.1_21_8.1.21.8+build.1-v2.jar

• Run javap:

  You can then run javap by providing the above path as the cp (class path) and the fully qualified class name as the final argument.

  javap -cp C:/project/.gradle/loom-cache/minecraftMaven/net/minecraft/minecraft-merged-503b555a3d/1.21.8-net.fabricmc.yarn.1_21_8.1.21.8+build.1-v2/minecraft-merged-503b555a3d-1.21.8-net.fabricmc.yarn.1_21_8.1.21.8+build.1-v2.jar -c -private net.minecraft.util.Identifier

  This will print the bytecode in your terminal output.