You may want to have a look at my little HJVM project on Github ( https://github.com/JPMoresmau/HJVM). Promise, I'll put in on Hackage some day. Basically it provides FFI wrappers and some c code to be able to start a JVM and call Java methods, etc from Haskell.
-- JP Moresmau http://jpmoresmau.blogspot.com/ On Tue, Nov 20, 2012 at 7:53 AM, Mathijs Kwik <math...@bluescreen303.nl>wrote: > KC <kc1...@gmail.com> writes: > > > 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? > > _______________________________________________ > Haskell-Cafe mailing list > Haskell-Cafe@haskell.org > http://www.haskell.org/mailman/listinfo/haskell-cafe >
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