[Haskell-cafe] Interacting with Java in GHCVM

Rahul Muttineni rahulmutt at gmail.com
Wed May 25 04:20:22 UTC 2016

Hi Alp,

I had a nice time going through inline-java and sparkle! The API I made up
for the Java FFI is similar to yours but I don't do the extensive
type-level hackery that you have. Another key difference is that I use GHC
Annotations to specify the qualified class name where you use type-level

Nice work supporting almost all of the JNI in a clean way! I recently
looked at the JNI API and it stated that the functions that interact with
the JVM are a tad slow due to reflection + the fact that native methods
don't get inlined. I'm interested in benchmarking programs compiled with
GHC/Sparkle vs GHCVM/FFI to Spark once the first release is out.


On Sun, May 22, 2016 at 1:05 PM, Alp Mestanogullari <alpmestan at gmail.com>

> Hi,
> For what it's worth, at Tweag we've developed some preliminary bindings to
> Apache Spark, and as part of this we developed a somewhat decent API for
> calling Java. You can check it out on hackage [1] and on github [2]. In
> cast that can save you some time or inspire you.
> [1]: http://hackage.haskell.org/package/inline-java
> [2]: https://github.com/tweag/sparkle -- see the inline-java directory
> On Sun, May 22, 2016 at 4:54 AM, Rahul Muttineni <rahulmutt at gmail.com>
> wrote:
>> Hi Haskell-Cafe,
>> I've been working on a JVM backend for GHC [1] and I took some time to
>> flesh out a design for the Java FFI [2] which will pretty much decide
>> whether the project will be useful or not. I would love feedback from the
>> community on how to improve the design or requests for important interop
>> features that I have neglected.
>> Thanks,
>> Rahul Muttineni
>> [1] http://github.com/rahulmutt/ghcvm
>> [2] https://gist.github.com/rahulmutt/355505bce57c7c2cffd7d4cf5edddad4
>> _______________________________________________
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> --
> Alp Mestanogullari

Rahul Muttineni
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