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本教程列举了将模组更新到加载器 0.4.x（或更高版本）所需要做的事情。

架构更改。在0.04.x，支持架构版本0，但不确保支持0.5.x或更高版本。

有用的资源：

• fabric.mod.json格式
• 示例模组，应该现在更新（update commit）

关于嵌套JAR的用途有很多疑惑。

嵌套JAR是：

• a solution to provide dependencies which are in the form of Fabric mods, allowing the loader to pick the best version matching a given modpack's sets of dependencies,
• a solution that allows you turning libraries into Fabric mods and avoiding conflicts where they are not cleanly shadowable or where there is good reason for a Fabric mod developer to be the authoritative versioning source,
• a potential solution to cleanly package subprojects/submodules of a mod in one “combined” JAR, while also allowing using them separately.

嵌套JAR不是:

• meant to be used on non-mod Java libraries,
• always the best solution for libraries which can be safely shadowed under a different package. Keep in mind that a Fabric mod ID can only exist once, meaning that potential version conflicts could prevent a pack from loading - shadowed libraries do not have this problem.

如有疑问，请参阅这个图表：

• 如果你的模组使用的是插件加载器，请将其放弃，改为采用入口点系统。