[Haskell-cafe] Re: Libraries for Commercial Users

Don Stewart dons at galois.com
Sat Oct 10 17:11:39 EDT 2009

> John,
> On Thu, Oct 8, 2009 at 3:20 PM, John A. De Goes <john at n-brain.net> wrote:
> [...]
> > JVM is cross-platform, and contains sufficient typing information to
> > permit one to write something like, "import foreign jvm
> > java.list.Collection", and have typed access to the whole class and all of
> > its methods.
> [...]
> Having painless Haskell <- Java interoperability would be great.  I'm
> curious though:  could it really be so simple as a one-line ``import
> foreign jvm'' directive?  I imagine the purity mismatch between
> Haskell and Java would be very troublesome.

No more so than C, surely. We're used to stateful APIs. They're a pain.

> With this hypothetical ``import foreign jvm'' mechanism, what would
> the be type of imported Java stuff?  Would it all be done in IO?
> The more I think about it, the trickier it seems.  Beside the purity
> mismatch of Haskell and Java, there is an OO/functional mismatch.

That's more of an issue. But the prior work has been done.

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