jython-dev

[Jython-dev] Questions for jython.

[Nabil O. <Nab...@cl...>]

Hi there, 

I want to use a java python translator but before I would like 
get informed about few issues. I would be grateful to have answer
for these questions ASAP.


        - Does jyhton provide a source only bridge or can it 
          use .jar and .class hierarchies ?

         - What is the runtime overhead associated passing
           between Java and Python ? Is some overhead present
           even when data is not passed between both of them ?

         - Can we have native methods written in Python for 
           Java classes ?

         - How is Java called from Python ?

         - What's the memory footprint for the system ?

         - Can python debugger access Java instances and
           classes?

         - Are there any limits restricting the use of 
           jython ? How about platforms ?

         - What are the limits imposed by the semantic
           differences of Java and Python ?


Thank you.

- Nabil:)
                   _\\|//_
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     +-*%+-*%+-*%ooO (_) Ooo+-*%+-*%+-*%
	  Nabil Obeid.
	  Cloakware Corp.
	  311-260 Hearst Way,
	  Kanata, Ontario, Canada,
	  Earth, Solar System, K2L 3H1.
                 .oooO
                 (   )   Oooo.
     +-*%+-*%+-*% \ (+-*%(   )+-*%+-*%+-*%
                   \_)    ) /
                         (_/

[Jython-dev] Webpage Applet Demos

[Mats W. <ma...@la...>]

 From jython.sourceforge.net/applets

Can't seem to get any of them to work...
and I seem to recall they've worked before.
Running W2K (SP2).  From IE 5.0, here's
the Java console output:

java.lang.InstantiationException: HelloWorld
	at com/ms/applet/BrowserAppletFrame.newInstance
	at com/ms/applet/AppletPanel.processSentEvent
	at com/ms/applet/AppletPanel.processSentEvent
	at com/ms/applet/AppletPanel.run
	at java/lang/Thread.run

(this is, of course, for the HelloWorld applet).
The Jython Loading display does come up.


 From Netscape 4.77 (what are these signature file
and manifest file errors?)

# Error: Invalid digital signature file (-7885)
#	jar file: C:\DOCUME~1\mats\LOCALS~1\Temp\jzipSB4A.TMP
#	path:     C:\DOCUME~1\mats\LOCALS~1\Temp\jzipSB4A.TMP
# Error: internal error - error in manifest file (-1)
#	jar file: C:\DOCUME~1\mats\LOCALS~1\Temp\jzipSB4A.TMP
#	path:     /applets/
# Applet exception: exception: java.lang.NullPointerException

java.lang.NullPointerException
   at org.python.core.PySystemState.add_package(Compiled Code)
   at org.python.core.PySystemState.add_package(Compiled Code)
   at org.python.core.Py.initProperties(Compiled Code)
   at org.python.core.Py.initProxy(Compiled Code)
* at HelloWorld.__initProxy__(Compiled Code)
   at HelloWorld.<init>(Compiled Code)
   at netscape.applet.DerivedAppletFrame$LoadAppletEvent.dispatch(Compiled 
Code)
   at java.awt.EventDispatchThread$EventPump.dispatchEvents(Compiled Code)
   at java.awt.EventDispatchThread.run(Compiled Code)
   at 
netscape.applet.DerivedAppletFrame$AppletEventDispatchThread.run(Compiled Code)

Re: [Jython-dev] Webpage Applet Demos

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

On Mon, 25 Jun 2001 12:29:06 -0500, you wrote:

> From jython.sourceforge.net/applets
>
>Can't seem to get any of them to work...
>and I seem to recall they've worked before.

It seems like the appletdemo.[jar,cab] was compiled while running java2.
That results in a reference to java.awt.event.HierarchyEvent which fails
in both browsers. I have recompile the demos and uploaded the new
appletdemo.* files and now it works for me (W2K SP2 & IE 5.0).

regards,
finn