KC
Instead of Haskell running on the JVM is there a way for Haskell to call a JVM language (or generate bytecode) to access the Java class libraries when needed?
I once did a small test to get this working. It's not that hard, but needs some work. It's fine for exposing a few functions though. Basically it's a 2-step process, eased by using a makefile or similar helper. You have to compile your haskell code into a shared object (.so on linux, .dll on windows), which includes the haskell runtime (rts). This library can be called from c. A small pitfall is that you first need to do a call to initialize the haskell runtime, and when you're done using it, close it. This is most easily just tied to your c/java program's main initialization functions. Java is able to load/use these shared libraries through JNI. Of course you lose your platform-independance, so if you want your java application to work on multiple platforms / OSses, you need to build shared objects for all of them. Last but not least: You have to export the haskell functions you want through FFI. Also, make sure they use raw data types such as CString, as that what C and java will give you and expect back. So basically you go Haskell FFI <-> C <-> Java JNI I'm sorry I cannot give you any links or code, because I'm in a bit of a hurry. But google and the ghc docs are your friend. Mathijs
Or
Is there a way for a JVM language or bytecode to call Haskell when needed?