For interop with existing java libraries take a look at IKVM.NET
Theres no particully reason why it couldn't be ported to JVM, but it would mean entirely rewriting the code generation portion of the compiler, I'm no expert here, but I imagine this would be very difficult. Also F# has been tailored to run on the CRL so into problems implmenting any feature that the CLR has that JVM does, I don't really know about the JVM but I think delegates might be an example of this. I guess it would mean ripping out the back end and starting again, but .
F# is open source in the sense that the source is available with the distribution, but the license is exactly GNU or BSD style so you may run into problems if you want to modify it then distribute you own version.
Cheers,
Rob
Oh yeah, forgot to say, rather than doing all that wouldn't it be easier just to use mono? I have done some minimalist testing with mono and everything seemed to work okay. I know there are other F# out there who use it regularly.
I know there are some overheads deploying the mono run time, but after that deploying .NET assemblies probably going to be as easy as deploying .jar files.
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How difficult might it be to port F# to Java's byte code? Are there technical issues? Is it impolite of me to ask since F# comes out of Microsoft's research labs? :) Is the source code for F# compiler open source?
Seriously, I would love to use F#; however, many of the existing libraries and systems I work with are written in Java and are suppose to run on various Unix envronments. Deploying a set of jar files is easier to deploy into production since one doesn't have to jump through a thousand hoops of permissions, testers, qa, etc. I know there is always Scala, but I prefer F# style syntax (since learning F# syntax also helps me with OCaml and Haskell).