[Caml-list] ocaml-java + lablgtk2

[Caml-list] ocaml-java + lablgtk2

[Sebastien Ferre]

Hi,

I am considering developping an OCaml
application using Lablgtk2 for the GUI,
and using ocaml-java/Nickel for calling
a Java library (namely, OWL-API). I am
working on Linux.

Has anybody tried this ? I am a bit afraid
of potential dependency problems...

---
Sébastien

Re: [Caml-list] ocaml-java + lablgtk2

[Gerd Stolpmann]

Am Donnerstag, den 08.03.2012, 14:58 +0100 schrieb Sebastien Ferre:
> Hi,
> 
> I am considering developping an OCaml
> application using Lablgtk2 for the GUI,
> and using ocaml-java/Nickel for calling
> a Java library (namely, OWL-API). I am
> working on Linux.
> 
> Has anybody tried this ? I am a bit afraid
> of potential dependency problems...

This cannot work. ocaml-java is running in a JVM, but lablgtk2 is
written for the standard runtime, and assumes standard conventions for
the C bindings it needs.

What you could try to do is to use the standard runtime, and load the
JVM dynamically for running the Java library, and connect both via JNI.
There is a generator for such cross calls by Xavier:

http://gallium.inria.fr/~xleroy/software.html#camljava

I've never used it, though.

Gerd

> 
> ---
> Sébastien
> 

-- 
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Re: [Caml-list] ocaml-java + lablgtk2

[Sebastien Ferre]

Hi,

On 03/08/2012 03:12 PM, Gerd Stolpmann wrote:
> Am Donnerstag, den 08.03.2012, 14:58 +0100 schrieb Sebastien Ferre:
>> Hi,
>>
>> I am considering developping an OCaml
>> application using Lablgtk2 for the GUI,
>> and using ocaml-java/Nickel for calling
>> a Java library (namely, OWL-API). I am
>> working on Linux.
>>
>> Has anybody tried this ? I am a bit afraid
>> of potential dependency problems...
>
> This cannot work. ocaml-java is running in a JVM, but lablgtk2 is
> written for the standard runtime, and assumes standard conventions for
> the C bindings it needs.
>
> What you could try to do is to use the standard runtime, and load the
> JVM dynamically for running the Java library, and connect both via JNI.
> There is a generator for such cross calls by Xavier:
>
> http://gallium.inria.fr/~xleroy/software.html#camljava
>
> I've never used it, though.

This looks promising, and adequate to my needs.
However, the last version dates back to 2004, and
is for java-1.4. Is there any chance it stills
works ? Has anybody used it recently ?

Sébastien

RE: [Caml-list] ocaml-java + lablgtk2

[CHAAR Rabih]

It still works for java 1.6 (windows)

Sincerely

-----Original Message-----
From: Sebastien Ferre [mailto:Sebastien.Ferre@irisa.fr] 
Sent: Friday,March 09,2012 3:09 PM
To: caml-list
Subject: Re: [Caml-list] ocaml-java + lablgtk2

Hi,

On 03/08/2012 03:12 PM, Gerd Stolpmann wrote:
> Am Donnerstag, den 08.03.2012, 14:58 +0100 schrieb Sebastien Ferre:
>> Hi,
>>
>> I am considering developping an OCaml
>> application using Lablgtk2 for the GUI,
>> and using ocaml-java/Nickel for calling
>> a Java library (namely, OWL-API). I am
>> working on Linux.
>>
>> Has anybody tried this ? I am a bit afraid
>> of potential dependency problems...
>
> This cannot work. ocaml-java is running in a JVM, but lablgtk2 is
> written for the standard runtime, and assumes standard conventions for
> the C bindings it needs.
>
> What you could try to do is to use the standard runtime, and load the
> JVM dynamically for running the Java library, and connect both via JNI.
> There is a generator for such cross calls by Xavier:
>
> http://gallium.inria.fr/~xleroy/software.html#camljava
>
> I've never used it, though.

This looks promising, and adequate to my needs.
However, the last version dates back to 2004, and
is for java-1.4. Is there any chance it stills
works ? Has anybody used it recently ?

Sébastien

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Re: [Caml-list] ocaml-java + lablgtk2

[Stefano Zacchiroli]

On Fri, Mar 09, 2012 at 03:09:17PM +0100, Sebastien Ferre wrote:
> This looks promising, and adequate to my needs.
> However, the last version dates back to 2004, and
> is for java-1.4. Is there any chance it stills
> works ? Has anybody used it recently ?

The version on SVN has more recent changes (by myself and Gregoire
Henry). They haven't yet been incorporated in a release worth of that
name most notably due to the lack of testing. We'd be welcome if you
could test the SVN version and --- assuming everything works fine ---
make a new proper release as an outcome.

Hope this helps,
Cheers.
-- 
Stefano Zacchiroli     zack@{upsilon.cc,pps.jussieu.fr,debian.org} . o .
Maître de conférences   ......   http://upsilon.cc/zack   ......   . . o
Debian Project Leader    .......   @zack on identi.ca   .......    o o o
« the first rule of tautology club is the first rule of tautology club »

Re: [Caml-list] ocaml-java + lablgtk2

[forum]

Le 8 mars 2012 à 15:12, Gerd Stolpmann a écrit :

> Am Donnerstag, den 08.03.2012, 14:58 +0100 schrieb Sebastien Ferre:
>> Hi,
>> 
>> I am considering developping an OCaml
>> application using Lablgtk2 for the GUI,
>> and using ocaml-java/Nickel for calling
>> a Java library (namely, OWL-API). I am
>> working on Linux.
>> 
>> Has anybody tried this ? I am a bit afraid
>> of potential dependency problems...
> 
> This cannot work. ocaml-java is running in a JVM, but lablgtk2 is
> written for the standard runtime, and assumes standard conventions for
> the C bindings it needs.

A first option would be to use a Java toolkit to develop the GUI
(AWT, Swing, SWT…).

I have spent quite a lot of time lately on OCaml-Java and made
some important improvements. Performances are now quite
acceptable (always faster than OCaml bytecode and "not so far"
from native code), and it is possible to call Java libraries without
using Nickel.

However, it is still now clear when OCaml-Java 2.0 will be released ;
moreover, it will be of "alpha" quality at first.

So, if you have to develop your application in the next month and/or
need to use stable software, then use
	 http://gallium.inria.fr/~xleroy/software.html#camljava
as suggested by Gerd.


Regards,

Xavier Clerc

Re: [Caml-list] ocaml-java + lablgtk2

[Sebastien Ferre]

On 03/09/2012 05:06 PM, Stefano Zacchiroli wrote:
> On Fri, Mar 09, 2012 at 03:09:17PM +0100, Sebastien Ferre wrote:
>> This looks promising, and adequate to my needs.
>> However, the last version dates back to 2004, and
>> is for java-1.4. Is there any chance it stills
>> works ? Has anybody used it recently ?
>
> The version on SVN has more recent changes (by myself and Gregoire
> Henry). They haven't yet been incorporated in a release worth of that
> name most notably due to the lack of testing. We'd be welcome if you
> could test the SVN version and --- assuming everything works fine ---
> make a new proper release as an outcome.

I could compile the SVN version and the test fine.
I did it with JDK1.7 on a Linux Fedora amd64.

> Hope this helps,

Yes, thanks!

Sebastien

Re: [Caml-list] ocaml-java + lablgtk2

[Sebastien Ferre]

On 03/09/2012 06:48 PM, forum@x9c.fr wrote:
>>> I am considering developping an OCaml
>>> application using Lablgtk2 for the GUI,
>>> and using ocaml-java/Nickel for calling
>>> a Java library (namely, OWL-API). I am
>>> working on Linux.
>>>
>>> Has anybody tried this ? I am a bit afraid
>>> of potential dependency problems...
>>
>> This cannot work. ocaml-java is running in a JVM, but lablgtk2 is
>> written for the standard runtime, and assumes standard conventions for
>> the C bindings it needs.
>
> A first option would be to use a Java toolkit to develop the GUI
> (AWT, Swing, SWT…).

I forgot to mention it, but I already have a lablgtk2 GUI,
which I want to reuse in a different setting.

> I have spent quite a lot of time lately on OCaml-Java and made
> some important improvements. Performances are now quite
> acceptable (always faster than OCaml bytecode and "not so far"
> from native code), and it is possible to call Java libraries without
> using Nickel.
>
> However, it is still now clear when OCaml-Java 2.0 will be released ;
> moreover, it will be of "alpha" quality at first.

OK, this is still good to know.

Regards,
Sébastien Ferré