
You can see Haxe custom annotations here.
Haxe target has some support native classes here: https://github.com/jtransc/jtransc/tree/master/jtransc-rt/resources
JA_* classes wraps boolean[], byte[], short[]… so they extend java.lang.Object and provide useful methods for reading, writting or constructing/deconstructing from/to Haxe primitive types.HaxeDynamicLoad class provides some methods for dynamic library loadingHaxeFfiLibrary interface works as internal interface for FFI loadingHaxeFormat provides a portable C/Java like String.format.HaxeIO provides portable IO utilities for all haxe targets.N class, provides some utility methods used by the runtime and that can be used by libraries. You can find which methods contains just examining those files.
R class provides an internal class for doing reflection stuff. Since there are potentially tons of calls to this class methods, it has a short name.