Jython

Apparently most Python modules should work with Jython, with the following
exceptions: modules that are targeted at a specific platform; modules that
contain functionality not included in the JVM; modules implemented in C.

Perhaps mapscriptc is implemented in C (guessing from the 'c' suffix) ?

-----Original Message-----
From: Vinko Vrsalovic [mailto:vinko@...]
Sent: 17 July 2002 11:21
To: jython-users@...
Subject: [Jython-users] External modules in Jython?


Hello,

	I'm trying to use jython to embed a python application in a
	JSP/Servlets environment (struts, and the like).

	My problem is: the application uses a python module that
	doesn't come with the standard library.

	I copied the modules built in /python-dir/site-packages/* to
	/jython-dir/Lib/, but jython complains the following way:

	Jython 2.1 on java1.3.1_02 (JIT: null)
	Type "copyright", "credits" or "license" for more information.
	>>> import mapscript
	Traceback (innermost last):
	  File "<console>", line 1, in ?
  	  File "/usr/java/jython/Lib/mapscript/__init__.py", line 1, in ?
	  File "/usr/java/jython/Lib/mapscript/mapscript.py", line 2, in ?
	ImportError: no module named mapscriptc

	mapscriptc is a shared library (mapscriptc.so) that is present
	in the Lib and Lib/mapscript directories (i copied it just to be
	sure it doesn't work).

	From python it works fine, and it's present directly in the
	site-packages dir.

	Is it possible to import those shared libraries? If so, how?

	What do I need to read? :-)

	Oh, and finally, is my main objective acheivable? (embedding the
	python-cgi app in a tomcat/struts environment?)

Thanks,
-- 
Vinko Vrsalovic <vinko[|-@...>
http://www.cprsig.cl


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Re: [Jython-users] External modules in Jython? From: Vinko Vrsalovic <vinko@cp...> - 2002-07-17 10:33 On Wed, Jul 17, 2002 at 11:20:32AM +0100, Kenworthy, Edward wrote: > Apparently most Python modules should work with Jython, with the following > exceptions: modules that are targeted at a specific platform; modules that > contain functionality not included in the JVM; modules implemented in C. > > Perhaps mapscriptc is implemented in C (guessing from the 'c' suffix) ? Yes, it's implemented in C :-( So is that a dead end? No workarounds or waiting for a next version? If so, I'll go for Zope or Webware and forget Java. Thanks, -- Vinko Vrsalovic <vinko[|-@...> http://www.cprsig.cl

RE: [Jython-users] External modules in Jython? From: Kenworthy, Edward <Edward.Kenworthy@ma...> - 2002-07-17 10:45 I'm by no means an expert but I believe it is a dead end yes, unless you can find a version of mapscriptc that's been implemented in Java ? -----Original Message----- From: Vinko Vrsalovic [mailto:vinko@...] Sent: 17 July 2002 11:42 To: Kenworthy, Edward Cc: 'vinko@...'; jython-users@... Subject: Re: [Jython-users] External modules in Jython? On Wed, Jul 17, 2002 at 11:20:32AM +0100, Kenworthy, Edward wrote: > Apparently most Python modules should work with Jython, with the following > exceptions: modules that are targeted at a specific platform; modules that > contain functionality not included in the JVM; modules implemented in C. > > Perhaps mapscriptc is implemented in C (guessing from the 'c' suffix) ? Yes, it's implemented in C :-( So is that a dead end? No workarounds or waiting for a next version? If so, I'll go for Zope or Webware and forget Java. Thanks, -- Vinko Vrsalovic <vinko[|-@...> http://www.cprsig.cl

Re: [Jython-users] External modules in Jython? From: Jan Wender <j.wender@sc...> - 2002-07-17 11:19 Attachments: Message as HTML      On Wed, Jul 17, 2002 at 06:41:36AM -0400, Vinko Vrsalovic wrote: > On Wed, Jul 17, 2002 at 11:20:32AM +0100, Kenworthy, Edward wrote: > > Apparently most Python modules should work with Jython, with the follow= ing > > exceptions: modules that are targeted at a specific platform; modules t= hat > > contain functionality not included in the JVM; modules implemented in C. > >=20 > > Perhaps mapscriptc is implemented in C (guessing from the 'c' suffix) ? >=20 > Yes, it's implemented in C :-( >=20 > So is that a dead end? Unless you are willing to reimplement it in Java or create a Java Native Interface Wrapper for it (which is probably rather complicated), yes. > If so, I'll go for Zope or Webware and forget Java. Will be probably the easier way to go. Cheerio, --=20 J.Wender@... - Fon +4970719457-257 Fax-211 science+computing ag - Hagellocher Weg 71-75 - 72070 T=FCbingen On the Internet, there is no 'they'. There's only a very, very large 'us'. (Douglas Ad= ams)

Re: [Jython-users] External modules in Jython? From: Danny Yoo <dyoo@hk...> - 2002-07-17 16:56 On Wed, 17 Jul 2002, Vinko Vrsalovic wrote: > On Wed, Jul 17, 2002 at 11:20:32AM +0100, Kenworthy, Edward wrote: > > Apparently most Python modules should work with Jython, with the following > > exceptions: modules that are targeted at a specific platform; modules that > > contain functionality not included in the JVM; modules implemented in C. > > > > Perhaps mapscriptc is implemented in C (guessing from the 'c' suffix) ? > > Yes, it's implemented in C :-( > > So is that a dead end? If you have the original C source code, it's possible to wrap it with SWIG: http://www.swig.org/ I have not tried it lately, but the last time I checked, it could wrap C code into Java modules. If it's possible to do this, then you can get access to them via Jython. It's a bit indirect, I admit. *grin* Best of wishes to you!

Re: [Jython-users] External modules in Jython? From: Vinko Vrsalovic <vinko@cp...> - 2002-07-17 18:54 On Wed, Jul 17, 2002 at 09:56:44AM -0700, Danny Yoo wrote: > > So is that a dead end? > > > If you have the original C source code, it's possible to wrap it with > SWIG: > > http://www.swig.org/ That's how the module is built now, actually, but SWIG generates the python module and the shared library for the module to access... > I have not tried it lately, but the last time I checked, it could wrap C > code into Java modules. If it's possible to do this, then you can get > access to them via Jython. It's a bit indirect, I admit. *grin* Through JNI, right? I guess, things are starting to get uglier than i thought, i better retreat :-) Thanks to all for the quick and useful answers, -- Vinko Vrsalovic <vinko[|-@...> http://www.cprsig.cl

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