jython-dev — Discussion of developing and enhancing Jython itself(!) (not how to use Jython)

[Jython-dev] Update to Demo\javaclasses\pygraph\PythonGraph.java

[Durant S. <si...@mi...>]

Hi Everyone,

I recently downloaded Jython2.0 (I'm new to Jython). I found that one of the
examples:

    Demo\javaclasses\pygraph\PythonGraph.java

needed updating (the version I downloaded does not use the textfield for
entering an expression, although the __main__ test in Graph.py does):

I have created an updated version, which I would like to submit to you
(I've tested it and it works for me). The modifications are very simple:


package pygraph;

import java.awt.*;
import java.awt.event.*;

import javax.swing.JTextField;

public class PythonGraph implements ActionListener {
    JTextField expression;
    Graph graph;

    public PythonGraph() {
        Frame frame = new Frame("Python Graph");
        String expr = "sin(x)";

        graph = new Graph(expr);
        frame.add(graph, "Center");

        expression = new JTextField(expr);
        frame.add(expression,"South");
        expression.addActionListener(this);

        frame.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent event) {
                System.exit(0);
            }
        });

        frame.pack();
        frame.setSize(300, 300);
        frame.setVisible(true);
    }

    public void actionPerformed(ActionEvent evt) {
        graph.setExpression(expression.getText());
    }

    public static void main(String[] args) {
        PythonGraph pg = new PythonGraph();
    }
}

If you want to add this to the distribution, please do. If you want to give
me credit,
you may use my name "Durant Schoon".

If it is inappropriate to make this submission to this list, I appologize in
advance
and ask only for redirection to the correct people / website / mailing list.

Thank you,

PS - thanks you guys, this looks like it's going to be fun (once I get it
all working :-)

--
Durant.

[Jython-dev] embedding jython in an ejb server

[Jim B. <jim...@ho...>]

hi guys,

i'm trying to embed jython inside a j2ee server (weblogic 5.10 sp8) to 
script some simple interactions in the ejb layer.  i can successfully create 
an interpreter, assign values from java into jython and retrieve them from 
jython into java.  but i can't do anything like simple arithmetic 
manipulation. when i try i get an exception from the Java SecurityManager.

any idea what's going on here?  is this simply a configuration problem or 
something more serious?  do you have experience embedding scripting inside 
j2ee apps?  btw- i'm new to python/jython, but i have a fair amount of 
experience with interactive environments like smalltalk and am trying to 
create a little experimental testbed inside my j2ee system.

thanks for your help,
...jim

_________________________________________________________________
Get your FREE download of MSN Explorer at http://explorer.msn.com

RE: [Jython-dev] Time-out an embedded Jython script

[Thomas B. B. <tb...@sy...>]

Hi again - thanks Brian - I'm going to clarify my setup a little more here:

I have several EJBs which supports a 'validate' method. This method
basically reads a validation script (Jython script) from a database, then
looks up a BSFManager EJB (session bean) via JNDI, then passes the script
read to the BSFManager's exec method, which then in turn invokes the Jython
interpreter to execute the script. 

Since the validation is run in an EJB in the AppServer, I cannot create or
manipulate threads neither from within the BSFManager EJB nor from within
the Jython script itself (as suggested below by Brian), and since the
"client" in this case is also an EJB, I cannot even create a new thread at
the client side, which then might be terminated in case of timeout.

However, I really need the timeout, since a user obviously can write a
Jython script that never halts, which then will bring the entire user
session to a halt...

Thanks again, happy jythoneering!

Thomas





> -----Original Message-----
> From: brian zimmer [mailto:bz...@zi...]
> Sent: 18. maj 2001 14:55
> To: Thomas Bang Biilmann; Jython Dev (E-mail)
> Subject: RE: [Jython-dev] Time-out an embedded Jython script
> 
> 
> Do you have control over the call to the BSFManager?  In 
> other words, I assume you are taking input from a user and 
> using the Jython
> interp to exec the statement.  Since you have no control over 
> threads within the appserver, how about wrapping the call in a Thread
> which can perform the necessary timeout functionality within the BSF.
> 
> ***** DISCLAIMER: I JUST WROTE THIS SITTING AT MY DESK, IT 
> HAS __NOT__ BEEN THOUROUGHLY TESTED! *****
> 
> from java.lang import Thread
> 
> def timeoutexec(stmt, timeout=0):
> 	t = TimeoutThread(stmt)
> 	t.start()
> 	t.join(timeout)
> 	if t.isAlive():
> 		# this thread should have timed-out by now
> 		print "going to time out the exec()"
> 		t.interrupt()
> 	else:
> 		print "no need to time out the exec()"
> 
> class TimeoutThread(Thread):
> 	def __init__(self, stmt):
> 		self.stmt = stmt
> 
> 	def run(self):
> 		try:
> 			# here's where you'd really call the bsf exec()
> 			exec(self.stmt)
> 		except:
> 			print "timedout"
> 
> if __name__ == '__main__':
> 	timeoutexec("import time; time.sleep(10)", 11 * 1000)
> 	timeoutexec("import time; time.sleep(11)", 10 * 1000)
> 
> I'm not exactly sure how the BSF works, but perhaps you can 
> implement something like the above and wrap all the calls.  
> There's some
> overhead in setting up all these threads, but if you really 
> need a timeout the above will work.
> 
> > -----Original Message-----
> > From: jyt...@li...
> > [mailto:jyt...@li...]On Behalf Of 
> Thomas Bang
> > Biilmann
> > Sent: Friday, May 18, 2001 3:20 AM
> > To: Jython Dev (E-mail)
> > Subject: [Jython-dev] Time-out an embedded Jython script
> >
> >
> > Hi all!
> >
> > In my quest for embedding Jython as a user-programmable 
> validation language
> > within Borland AppServer 4.5, I have the following question:
> >
> >   - How can I ensure that a call for the exec(...) method 
> of a BSFManager is
> > allowed to run only for a limited time frame? Thus, if a 
> user decides to
> > write a Jython script that never halts, the exec is 
> terminated when the
> > designated time frame expires.
> >
> > Please note that - as far as I know - developer control over thread
> > management within the AppServer is NOT an option, unfortunately...
> >
> > All ideas appreciated!
> >
> > Regards,
> > Thomas
> >
> >
> > _______________________________________________
> > Jython-dev mailing list
> > Jyt...@li...
> > http://lists.sourceforge.net/lists/listinfo/jython-dev
> 
> 

[Jython-dev] recursion/heap size in jython

[Carsten G. <ca...@cs...>]

Hi,

In Python I  can increase the recursion limit by sys.setrecursionlimit().
In Jython there isn't such attribute. So I get Exception in thread "main"
java.lang.OutOfMemoryError. But in Java ich could resolve this by starting
java as java -Xmx300000000 (increasing heap size). How can I do this in
Jython2.1? The -D flag seams to be similar to the -D flag in Java.


So long
cagi

-- 
--
   ich und mein Ego, wir werden Dir's heimzahlen
  ... never mind        __o      
                     _`\<,_    ca...@cs...   
                    (_)/ (_)   http://www.cs.tu-berlin.de/~cagi


"Wir sind Microsoft. Schalten sie ihre Schutzschirme ab und ergeben
sie sich. Sie werden assimiliert werden. Widerstand ist zwecklos."

RE: [Jython-dev] Time-out an embedded Jython script

[brian z. <bz...@zi...>]

Do you have control over the call to the BSFManager?  In other words, I assume you are taking input from a user and using the Jython
interp to exec the statement.  Since you have no control over threads within the appserver, how about wrapping the call in a Thread
which can perform the necessary timeout functionality within the BSF.

***** DISCLAIMER: I JUST WROTE THIS SITTING AT MY DESK, IT HAS __NOT__ BEEN THOUROUGHLY TESTED! *****

from java.lang import Thread

def timeoutexec(stmt, timeout=0):
	t = TimeoutThread(stmt)
	t.start()
	t.join(timeout)
	if t.isAlive():
		# this thread should have timed-out by now
		print "going to time out the exec()"
		t.interrupt()
	else:
		print "no need to time out the exec()"

class TimeoutThread(Thread):
	def __init__(self, stmt):
		self.stmt = stmt

	def run(self):
		try:
			# here's where you'd really call the bsf exec()
			exec(self.stmt)
		except:
			print "timedout"

if __name__ == '__main__':
	timeoutexec("import time; time.sleep(10)", 11 * 1000)
	timeoutexec("import time; time.sleep(11)", 10 * 1000)

I'm not exactly sure how the BSF works, but perhaps you can implement something like the above and wrap all the calls.  There's some
overhead in setting up all these threads, but if you really need a timeout the above will work.

> -----Original Message-----
> From: jyt...@li...
> [mailto:jyt...@li...]On Behalf Of Thomas Bang
> Biilmann
> Sent: Friday, May 18, 2001 3:20 AM
> To: Jython Dev (E-mail)
> Subject: [Jython-dev] Time-out an embedded Jython script
>
>
> Hi all!
>
> In my quest for embedding Jython as a user-programmable validation language
> within Borland AppServer 4.5, I have the following question:
>
>   - How can I ensure that a call for the exec(...) method of a BSFManager is
> allowed to run only for a limited time frame? Thus, if a user decides to
> write a Jython script that never halts, the exec is terminated when the
> designated time frame expires.
>
> Please note that - as far as I know - developer control over thread
> management within the AppServer is NOT an option, unfortunately...
>
> All ideas appreciated!
>
> Regards,
> Thomas
>
>
> _______________________________________________
> Jython-dev mailing list
> Jyt...@li...
> http://lists.sourceforge.net/lists/listinfo/jython-dev

[Jython-dev] Time-out an embedded Jython script

[Thomas B. B. <tb...@sy...>]

Hi all!

In my quest for embedding Jython as a user-programmable validation language
within Borland AppServer 4.5, I have the following question:

  - How can I ensure that a call for the exec(...) method of a BSFManager is
allowed to run only for a limited time frame? Thus, if a user decides to
write a Jython script that never halts, the exec is terminated when the
designated time frame expires.

Please note that - as far as I know - developer control over thread
management within the AppServer is NOT an option, unfortunately...

All ideas appreciated!

Regards,
Thomas

Re: [Jython-dev] Zope, python, and "jython"...

[<ba...@di...>]

I suspect you're also going to run into problems when you hit Zope's
reliance on ExtensionClass, or any of the other CPython extension
modules.

Not to discourage you though!  Remember, Guido told JimH that JPython
itself could never be done. :)

-Barry

Re: [Jython-dev] Zope, python, and "jython"...

[brian z. <bz...@zi...>]

Tom,

Since Java has no means of changing the current working directory, Jython will not be able to implement os.chdir() without resorting to JNI.  

As for not finding os.path, that might be a jview thing.  Try:

clspack -auto

and see if that helps.

brian

At 03:51 PM 5/15/2001 -0400, Emerson, Tom # El Monte wrote:

>[Background for the folks at jython-dev: I'm trying to "port" a program called "Zope" to the HP3000 platform.  Zope is written in Python, but the version of Python that is currently available for the HP is *just* one version shy of what I need...]
>
>Well, here's an interesting twist... 
>
>Since the version of python on the HP is 1.5.1 and Zope needs 1.5.2, someone suggested "jython" [a.k.a. jpython] -- a java implementation of python -- as a workaround.  Intriguingly, it SEEMS to work [to a degree] however I'm getting a compilation error:
>
>:jython wo_pcgi.py 
>
>------------------------------------------------------------------------------ 
>Compiling python modules 
>Traceback (innermost last): 
>  File "wo_pcgi.py", line 116, in ? 
>  File "wo_pcgi.py", line 104, in main 
>  File "/EMERSON/SRC/Zope-2.3.2-src/inst/build_extensions.py", line 90, in ? 
>  File "/EMERSON/SRC/Zope-2.3.2-src/inst/do.py", line 98, in ? 
>AttributeError: class 'org.python.modules.os' has no attribute 'chdir' 
>: 
>
>Equally interesting, if I try this on a Windows PC, as in: 
>
>C:\bin\Zope-2.3.2-src>\bin\jython wo_pcgi.py 
>
>it fails with the following: 
>
>Traceback (innermost last): 
>  File "wo_pcgi.py", line 116, in ? 
>  File "wo_pcgi.py", line 101, in main 
>  File "wo_pcgi.py", line 95, in setup 
>AttributeError: class 'org.python.modules.os' has no attribute 'path' 
>C:\bin\Zope-2.3.2-src> 
>
>Interesting that "org.python.modules.os" comes up with different errors for different systems -- here is the file: 
>
>// Copyright ` Corporation for National Research Initiatives 
>package org.python.modules; 
>
>import org.python.core.*; 
>
>public class os implements ClassDictInit { 
>    public static String[] __depends__ = new String[] {"javaos", }; 
>
>    // An ugly hack, but it keeps the site.py from CPython2.0 happy 
>
>    public static String __file__ = 
>          Py.getSystemState().prefix.toString() + "/Lib/javaos.py"; 
>    
>    public static void classDictInit(PyObject dict) { 
>        // Fake from javaos import * 
>        PyFrame frame = new PyFrame(null, dict, dict, null); 
>        org.python.core.imp.importAll("javaos", frame); 
>    } 
>} 
>However, I suspect the problem lies in "PyFrame" which begins with: 
>
>public class PyFrame extends PyObject 
>{ 
>    public PyFrame f_back; 
>    public PyTableCode f_code; 
>    public PyObject f_locals; 
>    public PyObject f_globals; 
>    public int f_lineno; 
>    public PyObject f_builtins; 
>    public PyObject[] f_fastlocals; 
>        [and then gets into actual routine definitions, so the above is the extent of locally defined attributes...] 
>
>I'm presuming then, from the "extends" statement, that this is expected to be in "PyObject.java", but I'm reaching my limit of "searching for it..." -- does anyone have a suggestion to kick around?  [Charlie -- feel free to copy this to the lazug list/group]
>
>More FYI info: here's the java version on the HP: 
>java version "JavaVM-1.3.0" 
>Java(TM) 2 Runtime Environment, Standard Edition (build A.30.00 built on 11/28/0 
>0-10:09) 
>Classic VM (build A.30.00 02/05/01-15:43, build green threads, HP JIT) 
>: 
>
>and on windows:  (jview) 
>Microsoft (R) Command-line Loader for Java  Version 5.00.3309 
>Copyright (C) Microsoft Corp 1996-2000. All rights reserved. 
>
>Tom Emerson 
>Sr. Systems Analyst 
>Global Payments 
>tom...@gl... 
>626-258-4309 
>626-350-3832 FAX 

[Jython-dev] Re: where to put the registry file on Win NT

[<Arm...@t-...>]

Hi Charles,

thank you for your response. This works for me, too. But, what about personal
registry files, very important, IMO, on WTS ?

Regards

AE

> hello Armin,
>
> I'm using Windows NT and my registry file is called
> c:\jython-2.0\registry
>
> no extension needed.
>
> charles simons
>
> --- Armin Ehrenfels <Arm...@t-...>
> wrote:
> > Hi folks,
> >
> > after month working successfully on Linux, I'm
> > trying to run a Jython
> > application on WinNT. Now, maybe this has been
> > mentioned some time
> > somewhere, but I can't find it neither in the online
> > docs nor in the
> > FAQ's : where do I have to put my Linux .jython file
> > under WinNT.
> > Please, help me ...
> >
> > Thank you in advance and regards
> >
> > AE

Re: [Jython-dev] Where to put registry on WinNT

[charles F s. <yr...@ya...>]

hello Armin,

I'm using Windows NT and my registry file is called
c:\jython-2.0\registry

no extension needed.

charles simons


--- Armin Ehrenfels <Arm...@t-...>
wrote:
> Hi folks,
> 
> after month working successfully on Linux, I'm
> trying to run a Jython
> application on WinNT. Now, maybe this has been
> mentioned some time
> somewhere, but I can't find it neither in the online
> docs nor in the
> FAQ's : where do I have to put my Linux .jython file
> under WinNT.
> Please, help me ...
> 
> Thank you in advance and regards
> 
> AE
> 
> _______________________________________________
> Jython-dev mailing list
> Jyt...@li...
>
http://lists.sourceforge.net/lists/listinfo/jython-dev


__________________________________________________
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RE: [Jython-dev] Jython and IBM 1.3 JDK

[charles F s. <yr...@ya...>]

Hello,

Did anyone get a 3x speed increase after downloading &
installing IBM's JDK?  My informal benchmarks show a
10 - 15 percent DECREASE. 

Just wondering what others results were.

Charles Simons

> > -----Original Message-----
> > From: Kevin Altis [mailto:al...@se...]
> > Sent: Saturday, May 12, 2001 8:29 PM
> > To: jyt...@li...
> > Subject: [Jython-dev] Jython and IBM 1.3 JDK
> > 
The IBM JDK is much faster
> (3x - 4x 
> > on the other
> > Java apps I'm running) than the Sun 1.3 HotSpot
> implementation.


__________________________________________________
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Yahoo! Auctions - buy the things you want at great prices
http://auctions.yahoo.com/

RE: [Jython-dev] Jython and IBM 1.3 JDK

[Humbel O. <Otm...@bi...>]

Hello,

We had some troubles with different versions of apache xerxes, since IBM
ships his own version.
Removing xerxes.jar from /jre/lib/ext of the IBM jdk solved these problems.

My advice: take care in the XML area. But this was 2 -3 Months ago ....


Best wishes,
Oti.


> -----Original Message-----
> From: Kevin Altis [mailto:al...@se...]
> Sent: Saturday, May 12, 2001 8:29 PM
> To: jyt...@li...
> Subject: [Jython-dev] Jython and IBM 1.3 JDK
> 
> 
> The platform specific notes page 
> http://jython.org/platform.html doesn't
> mention the IBM JDK 1.3 for Windows as a recommended platform 
> for Windows
> NT, 95, and 98, Windows 2000. Is there an issue with the IBM JDK (link
> below) that causes problems with Jython? I modified the jython.bat and
> jythonc.bat files to use the IBM JDK which on the simple 
> tests I've done so
> far seems to work fine. The IBM JDK is much faster (3x - 4x 
> on the other
> Java apps I'm running) than the Sun 1.3 HotSpot implementation.
> 
> IBM Developer Kit for Windows(R), Release 1.3.0
> http://www7b.boulder.ibm.com/wsdd/wspvtdevkit-info.html
> 
> ka
> ---
> Kevin Altis
> al...@se...
> 
> 
> _______________________________________________
> Jython-dev mailing list
> Jyt...@li...
> http://lists.sourceforge.net/lists/listinfo/jython-dev
> 

[Jython-dev] Where to put registry on WinNT

[<Arm...@t-...>]

Hi folks,

after month working successfully on Linux, I'm trying to run a Jython
application on WinNT. Now, maybe this has been mentioned some time
somewhere, but I can't find it neither in the online docs nor in the
FAQ's : where do I have to put my Linux .jython file under WinNT.
Please, help me ...

Thank you in advance and regards

AE

[Jython-dev] Let your Computer pay for itself and your house!

[<fo...@co...>]

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The 0.2% response to that is 1000 orders for Report # 3.
 

Those 1000 people send out 5,000 e-mails each for a total of 5 
million
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Report # 4.
 

Those 10,000 people send out 5,000 e-mails each for a total of 
50,000,000
(50 million) e-mails.
 
The 0.2% response to that is 100,000 orders for Report
# 5 THAT'S 100,000 ORDERS TIMES $5 EACH=$500,000.00 (half 
million).
Your total income in this example is: 1..... $50 + 2..... $500 + 
3.....
$5,000 + 4.... $50,000 + 5..... $500,000 ........ Grand 
Total=$555,550.00
 

NUMBERS DO NOT LIE. GET A PENCIL & PAPER AND FIGURE OUT THE WORST 
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A LOT OF
MONEY !
 
 
 
-----------------------------------------------------------------
-----------
 

REMEMBER FRIEND, THIS IS ASSUMING ONLY 10 PEOPLE
ORDERING OUT OF 5,000 YOU MAILED TO.
Dare to think for a moment what would happen if everyone or half 
or even one
4th of those people mailed 100,000e-mails each or more? There are 
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people will do just that, and more!
 
 
 

-----------------------------------------------------------------
-----------
 
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=========== AVAILABLE REPORTS ====================
ORDER EACH REPORT BY ITS NUMBER & NAME ONLY.
====================================================
Notes:
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___________________________________________________
 
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___________________________________________________
 
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___________________________________________________
 
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___________________________________________________
 
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____________________________________________________________
$$$$$$$$$ YOUR SUCCESS GUIDELINES $$$$$$$$$$$
 
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=== After you have received 10 orders, 2 to 3 weeks after that 
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=== Once you have received 100 or more orders for Report # 2, YOU
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======================================================
 

FOLLOWING IS A NOTE FROM THE ORIGINATOR OF THIS PROGRAM:
 
You have just received information that can give you
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Remember though, the more you send out the more potential 
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======================================================
 

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=======================================================
''I had received this program before. I deleted it, but later I 
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=======================================================
 

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=======================================================
ORDER YOUR REPORTS TODAY AND GET STARTED ON
'YOUR' ROAD TO FINANCIAL FREEDOM !
=======================================================
 
About 50,000 new people get online every month!
_______________________________________________________
 

FOR YOUR INFORMATION....
If you need help with starting a business, registering a business 
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Under Bill S1618 Title III passed by the 105th US Congress this 
letter
cannot be considered spam as long as the sender includes contact 
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and a method of removal.
 
 This is a one time e-mail transmission. No request for removal 
is necessary.
 

If you have any questions of the legality of this program, 
contact the
Office of Associate Director for Marketing Practices, Federal 
Trade
Commission, Bureau of Consumer Protection, Washington, D.C.
 
-----------------------------------------------------------------
-----------
 
 
 
 
 
 
 

[Jython-dev] Jython and IBM 1.3 JDK

[Kevin A. <al...@se...>]

The platform specific notes page http://jython.org/platform.html doesn't
mention the IBM JDK 1.3 for Windows as a recommended platform for Windows
NT, 95, and 98, Windows 2000. Is there an issue with the IBM JDK (link
below) that causes problems with Jython? I modified the jython.bat and
jythonc.bat files to use the IBM JDK which on the simple tests I've done so
far seems to work fine. The IBM JDK is much faster (3x - 4x on the other
Java apps I'm running) than the Sun 1.3 HotSpot implementation.

IBM Developer Kit for Windows(R), Release 1.3.0
http://www7b.boulder.ibm.com/wsdd/wspvtdevkit-info.html

ka
---
Kevin Altis
al...@se...

Re: [Jython-dev] Change of link

[<bc...@wo...>]

[Bruce Eckel]

>My site has been redesigned. The link in the page:
>http://www.jython.org/
>In the text:
>8-dec-2000 
>Bruce Eckel has release a new revision of his Thinking in
>Patterns with Java book and chapter 9 has been updated to
>cover Jython. 
>Was:
>http://www.mindview.net/TIPatterns/index.html
>Is now
>http://www.mindview.net/Books/TIPatterns/

Now updated. Thanks for notifying us about the change.

regards,
finn

[Jython-dev] question about jython applets

[Martijn J. <ma...@ea...>]

Hello!


I have a question about jython compiled applets. In the documentation it says
that jythonc compiles python code into java byte code. Why is it needed that
it includes 150K of jython libraries to the java files? This means that 
jythonc doesn't compile to plain javacode, but it compiles a sort of wrapper
which makes it possible to execute pythoncode in a java applet?


thanks in advance.


(BTW : it's really cool that it's possible to combine the python code with 
java-applets!!!)

[Jython-dev] Hi

[<jo...@ao...>]

Hi

[Jython-dev] Hi

[<jo...@ao...>]

Hi

[Jython-dev] Change of link

[Bruce E. <Br...@Ec...>]

My site has been redesigned. The link in the page:
http://www.jython.org/
In the text:
8-dec-2000 
Bruce Eckel has release a new revision of his Thinking in
Patterns with Java book and chapter 9 has been updated to
cover Jython. 
Was:
http://www.mindview.net/TIPatterns/index.html
Is now
http://www.mindview.net/Books/TIPatterns/

Sorry for the inconvenience.s

Most current information can be found at:
http://www.mindview.net/notes.html
===================
Bruce Eckel    http://www.BruceEckel.com
Contains free electronic books: "Thinking in Java 2e" &
"Thinking in C++ 2e"
Please subscribe to my free newsletter -- just send any
email to:
joi...@ea...
My schedule can be found at:
http://www.mindview.net/Calendar/Calendar.html
===================

[Jython-dev] Low Cost High Quality Track Lighting

[Lightwaves C. <mi...@li...>]

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but still have standard incandescent lighting?

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You will not recieve any more messeges after this email.

Re: [Jython-dev] Problem with method overrides in latest CVS jython?

[<bc...@wo...>]

[Rich Seddon]

>I've been playing with the latest jython from CVS, and I'm having some 
>trouble getting my code to work with it. When I attempt to call a Java method 
>that is overridden in a python class, but not overridden in all intermediate 
>python classes, I get a stack overflow. 
>
>The following test program fails using the latest CVS, but works fine if I 
>pull jython using the "Release_2_1alpha1" tag:
>
>from javax.swing import *
>
>class fooFrame(JFrame):
>    def __init__(self):
>        JFrame.__init__(self)
> 
>class barFrame(fooFrame):
>    def __init__(self):
>        fooFrame.__init__(self)
> 
>    def setSize(self, width, height):
>        fooFrame.setSize(self, width, height)
> 
> 
>if __name__ == "__main__":
>    frm = barFrame()
>    frm.setSize(100,100)
> 
>    frm.show()
>

Thanks for the test program. The bug was introduced as a side effect of
solving the old SubSubDate problem.


http://sourceforge.net/tracker/?group_id=12867&atid=112867&aid=222819&func=detail

Clearly the cure is worse than the disease so I have reverted the
change. Deeper thinking is still needed on this problem. Just
considering the situation where the call of a super method skip one
level. Using the current "super__" naming scheme will never be enough to
handle the JFrame.setSize() call in barFrame.setSize():

from javax.swing import *

class fooFrame(JFrame):
    def __init__(self):
        JFrame.__init__(self)

    def setSize(self, width, height):
        JFrame.setSize(self, width, height)

class barFrame(fooFrame):
    def __init__(self):
        fooFrame.__init__(self)

    def setSize(self, width, height):
        JFrame.setSize(self, width, height)

if __name__ == "__main__" and 1:
    frm = barFrame()
    frm.setSize(100,100)

    frm.show()

regards,
finn

Re: [Jython-dev] Freeplay project

[<bc...@wo...>]

[James Holmes]

>Could you please add this project to to your Jython users list?
>
>www.free-schooling.org
>
>The Freeplay project is developing a free course authoring tool which 
>can be used to create lessons which are more like adventure games than 
>school lessons. Jython is used as the scripting language.

Done. Thanks.

regards,
finn

Re: [Jython-dev] Error while getting FAQ-entries

[<bc...@wo...>]

[Waclawczyk Janusch]

>Hi,
>
>I've got rather strange behaviour, when trying following links:
>
>http://jython.sourceforge.org/cgi-bin/faqw.py?req=index
> strange content-type needed
>http://jython.sourceforge.net/cgi-bin/faqw.py?req=index
>folowing message:
><H3>Traceback (innermost last):</H3>
><PRE>  File "/home/groups/j/jy/jython/cgi-bin/faqw.py", line 24, in ?
>    os.chdir(FAQDIR)
><B>OSError: [Errno 2] No such file or directory: '/home/groups/jython/FAQ/data'
></B></PRE>
><BR>(times: user 0.05, sys 0.01, ch-user 0, ch-sys 0, real 0.12)

Thank you for reporting this.

It was caused by a directory reorganization on the sourceforge machine.
I have now done the dance needed to getting the faqwizard back up:

  http://www.jython.org/cgi-bin/faqw.py?req=index

regards,
finn

RE: [Jython-dev] Why do python classes show up in Java under weir d names?

[Garcia, M. <mg...@Bu...>]

Hi Kenny,
you can write you own custom class loader if you have requirements that the
primordial (system) class loader won't give you or if you need to load your
classes from some other source.  The system (core classes) files are always
loaded first and anything else gets loaded off the classpath as needed.
From what Finn was saying though, it seemslike Jython already has a custom
class loader.  

The Class.forName() loads the named class (if not already loaded) into the
Java interpreter and returns a Class object for it.  If you want to check
for a loaded Jython class I suggest trying the getName() method which
returns a string.  

I dug up this URL that might help you get started, 
http://www.javaworld.com/javaworld/javatips/jw-javatip39.html

later - Mick


-----Original Message-----
From: Kenny Leung
To: jyt...@li...
Sent: 5/7/01 12:56 AM
Subject: Re: [Jython-dev] Why do python classes show up in Java under weird
names?


On Friday, May 4, 2001, at 11:05 AM, Finn Bock wrote:

> Please keep in mind that getting the class name right is just one part
> of the problem. The proxy classes are loaded by a custom classloader
> (some instance of BytecodeLoader). By default, I doubt that the
> Class.forName() call used by the framework will find the classes
loaded
> by the BytecodeLoaders. If it is jython that loads the framework, I
can
> ways of ensuring that the framework can find the proxyclasses.

Thanks for the answers, Finn. Yes, you're right. Further experimentation

reveals that the class.forName call uses the "standard" class loader, 
whichever that one is. Here's the backtrace.

java.lang.ClassNotFoundException: org.python.proxies.Main$Main$1
	at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:297)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:286)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:253)
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:120)

The documentation is sketchy on this front, but there seems to be no way

to replace this standard class loader, nor is there a way to tell it 
that the class is already loaded in the system. (I assume it has been 
loaded into the system, because the code from this class has alredy been

run. I'm not sure if this is true since I don't know how the Jython 
internals work.) If this is correct, Java is pretty broken. Even though 
a class has already been loaded in the system, there's no way to tell 
other parts of the system!

-Kenny

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