On 2013-05-09 17:04, Hans Georg Schaathun wrote:
Does anyone have experience with integrating Haskell and Java? I have done some searching, finding a lot of pointers but hardly anything in terms of evaluation, successes, or caveats.
From what I see Frege looks promising, arguably not haskell I suppose, but does it work? Other projects I have seen appear to have reached a stand-still for ages.
The background for the question is that I will contribute some control algorithms based on machine learning or AI in a larger project. It would save me a lot of time if I could write in Haskell, but only assuming that interfacing with Java afterwards is trivial compared to writing everything in java in the first place. I am, perhaps, particularly worried that a Haskell-lookalike for JVM might be unable to optimise properly, like not being lazy. Any advice?
I have successfully written Java/Haskell programs using the Java Native Interface. You can find my JNI to Haskell binding library at https://github.com/neurocyte/foreign-jni. I am primarily using it to write Android Apps with Haskell, but I’ve done a little testing with the standard JVM and it works fine. There is a bare bones demonstration of a Java/Haskell application at https://github.com/neurocyte/android-haskell-activity. That is for Android, but the basic principals are the same for plain JVM integration. I am currently working on a tool to generate full (or at least fully usable) Haskell bindings to Java libraries (using foreign-jni), including being able to implement Java callback interfaces in Haskell. That is still a work in progress though and I have not yet published it to github. The intent is to generate a full set of bindings to the Android API, but it is pretty generic and should work for any Java API. -- CJ van den Berg mailto:cj@vdbonline.com xmpp:neurocyte@gmail.com