| Interface | Description | 
|---|---|
| FMLContainerHolder | |
| ICrashCallable | |
| IFMLHandledException | |
| IFMLSidedHandler | |
| IFuelHandler | |
| ILanguageAdapter | |
| IWorldGenerator | This is called back during world generation. | 
| ModContainer | The container that wraps around mods in the system. | 
| WorldAccessContainer | 
| Class | Description | 
|---|---|
| AutomaticEventSubscriber | Automatic eventbus subscriber - reads  Mod.EventBusSubscriberannotations and passes the class instances to thenet.minecraftforge.common.MinecraftForge.EVENT_BUS | 
| CertificateHelper | |
| ClassNameUtils | |
| DummyModContainer | |
| EnhancedRuntimeException.WrappedPrintStream | |
| FMLCommonHandler | The main class for non-obfuscated hook handling code
 Anything that doesn't require obfuscated or client/server specific code should
 go in this handler
 It also contains a reference to the sided handler instance that is valid
 allowing for common code to access specific properties from the obfuscated world
 without a direct dependency | 
| FMLContainer | |
| FMLLog | |
| FMLModContainer | |
| ILanguageAdapter.JavaAdapter | |
| ILanguageAdapter.ScalaAdapter | |
| InjectedModContainer | |
| LoadController | |
| Loader | The loader class performs the actual loading of the mod code from disk. | 
| MCPDummyContainer | |
| MetadataCollection | |
| MetadataCollection.ArtifactVersionAdapter | |
| MinecraftDummyContainer | |
| ModAPIManager | |
| ModClassLoader | A simple delegating class loader used to load mods into the system | 
| ModContainerFactory | |
| ModMetadata | |
| ObfuscationReflectionHelper | Some reflection helper code. | 
| Optional | Classes annotated with this will have the named interface or method removed from the runtime definition of the class
 if the modid specified is missing. | 
| ProgressManager | Not a fully fleshed out API, may change in future MC versions. | 
| ProgressManager.ProgressBar | Not a fully fleshed out API, may change in future MC versions. | 
| ProxyInjector | |
| StartupQuery | |
| TracingPrintStream | PrintStream which redirects it's output to a given logger. | 
| ZipperUtil | Copied from http://stackoverflow.com/questions/1399126/java-util-zip-recreating-directory-structure
 because the code looked very tidy and neat. | 
| Enum | Description | 
|---|---|
| LoaderState | The state enum used to help track state progression for the loader | 
| LoaderState.ModState | |
| ModContainer.Disableable | 
| Exception | Description | 
|---|---|
| DuplicateModsFoundException | |
| EnhancedRuntimeException | RuntimeException that gives subclasses the simple opportunity to write extra data when printing the stack trace. | 
| Java8VersionException | |
| LoaderException | |
| LoaderExceptionModCrash | Prevent LoaderException from adding its own stack trace to the wrapped throwable's stack trace. | 
| MissingModsException | |
| StartupQuery.AbortedException | Exception not being caught by the crash report generation logic. | 
| WrongMinecraftVersionException | 
| Annotation Type | Description | 
|---|---|
| API | |
| Mod | This defines a Mod to FML. | 
| Mod.CustomProperty | A custom key => value property pair for use with  Mod.customProperties() | 
| Mod.EventBusSubscriber | A class which will be subscribed to  net.minecraftforge.common.MinecraftForge.EVENT_BUSat mod construction time. | 
| Mod.EventHandler | Marks the associated method as handling an FML lifecycle event. | 
| Mod.Instance | Populate the annotated field with the mod instance based on the specified ModId. | 
| Mod.InstanceFactory | Mod instance factory method. | 
| Mod.Metadata | Populate the annotated field with the mod's metadata. | 
| Optional.Interface | Used to remove optional interfaces | 
| Optional.InterfaceList | Mark a list of interfaces as removable | 
| Optional.Method | Used to remove optional methods | 
| SaveInspectionHandler | A method annotated with this on the  Modwill be called whenever a local save is listed in
 the save games list. | 
| SidedProxy | Sided proxies are loaded based on the specific environment they find themselves loaded into. |