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In-Memory

With the -inmemory flag HeadlessMc can even launch the game inside the same JVM that is running HeadlessMc itself. Making it possible to really run Minecraft anywhere, where a JVM can run.

Since HeadlessMc contains some libraries that Minecraft also uses, but different versions which could clash, it is important to keep the classloading seperate. This can be done with the Launcher-Wrapper.

Classloading for In-Memory Launching with LauncherWrapper: 

graph TD
  A[SystemClassloader] --> B[LauncherWrapper];
  B --> C[PluginClassloader];
  C --> D[HeadlessMc];
  A[JVM Classloader] --> E[URLClassloader];
  E --> F[Modloader];
  F --> G[Minecraft];

Classloading for Forge: 

graph TD
  A[SystemClassloader] --> B[LauncherWrapper];
  B --> C[PluginClassloader];
  C --> D[HeadlessMc];
  A[JVM Classloader] --> E[BootstrapLauncherClassloader];
  E --> F[Forge/Neoforge];
  F --> G[Minecraft];