jython-users — Discussion of and questions about using Jython

[Jython-users] compiling Python to JVM bytecode

[Joshua F. <jo...@jo...>]

I'm interested in learning more about how jythonc works. I see that it 
produces an intermediate file which is then compiled to bytecode with javac.

A few questions come to mind:

Did the creators consider using Java as an intermediate, rather than 
generating bytecode directly (OK, Java source code is easier to produce, 
but isn't it possible to compile non-Java directly to bytecode?)

Why is the absolute path of the *.py file embedded into the generated 
*.java file, and thence in the bytecode? What use could that be, 
considering that we can certainly move class files around?

More generally: Is there any documentation available about how jythonc works?

Re: [Jython-users] Besoins de memoire a =?iso-8859-1?Q?l=27ex=E9cution?=

[Ype K. <yk...@xs...>]

Marie Fran=E7oise,

>Lorsque je lance mon code en JAVA j'utilise l'option -Xmx :
>java -Xmx200m  moncode.
>Si j'=E9cris mon main en Jython et que je lance la commande
>jython < moncode.py,
>j'obtiens le message :
>Out of  Memory. You might want to try the -mx option to increase heap
>size.
>Comment passer ce param=E8tre =E0 Jython?

Normalement le message 'Out of Memory' indique un erreur dans
la programme, peut =EAtre r=E9cursion infinitive ou trop de (grands)
objects alloc=E9s.

En outre, poser la question en anglais te donneras plus de r=E9ponse.

Bonne chance,
Ype
-- 

Re: [Jython-users] Besoins de memoire a =?iso-8859-1?Q?l=27ex=E9cution?=

[hamish <ha...@ic...>]

Pardonnez moi.

<<En Win32....

<<In Win32...

hamish wrote:

> Dans la fiche <<jython.bat>> ce qui lance la JVM, il y a la texte <<java
> "-Dpython.home=C:\jython20" -c ...>>.
> Il est possible de mettre l'option -Xmx là.
>
> Marie Francoise Robeau wrote:
>
> > Lorsque je lance mon code en JAVA j'utilise l'option -Xmx :
> > java -Xmx200m  moncode.
> > Si j'écris mon main en Jython et que je lance la commande
> > jython < moncode.py,
> > j'obtiens le message :
> > Out of  Memory. You might want to try the -mx option to increase heap
> > size.
> > Comment passer ce paramètre à Jython?
> >
> > _______________________________________________
> > Jython-users mailing list
> > Jyt...@li...
> > https://lists.sourceforge.net/lists/listinfo/jython-users
> > .
>
> Quick translation :
> When I run my code in Java, I use the -Xmx option:
> java -Xmx200m  mycode
> If I write my main in Jython and when I run the command
> jython < moncode.py
> I get the messate
> Out of Memory ....
> How do I pass this parameter to Jython?
>
> _______________________________________________
> Jython-users mailing list
> Jyt...@li...
> https://lists.sourceforge.net/lists/listinfo/jython-users

Re: [Jython-users] Besoins de memoire a =?iso-8859-1?Q?l=27ex=E9cution?=

[hamish <ha...@ic...>]

Dans la fiche <<jython.bat>> ce qui lance la JVM, il y a la texte <<java
"-Dpython.home=C:\jython20" -c ...>>.
Il est possible de mettre l'option -Xmx là.

Marie Francoise Robeau wrote:

> Lorsque je lance mon code en JAVA j'utilise l'option -Xmx :
> java -Xmx200m  moncode.
> Si j'écris mon main en Jython et que je lance la commande
> jython < moncode.py,
> j'obtiens le message :
> Out of  Memory. You might want to try the -mx option to increase heap
> size.
> Comment passer ce paramètre à Jython?
>
> _______________________________________________
> Jython-users mailing list
> Jyt...@li...
> https://lists.sourceforge.net/lists/listinfo/jython-users
> .

Quick translation :
When I run my code in Java, I use the -Xmx option:
java -Xmx200m  mycode
If I write my main in Jython and when I run the command
jython < moncode.py
I get the messate
Out of Memory ....
How do I pass this parameter to Jython?

[Jython-users] =?iso-8859-1?Q?RE:_=5BJython-users=5D_Besoins_de_memoire_a_l'ex=E9cution?=

[Karim Y. <ee...@ei...>]

Hi Francois,
sorry if I cannot answer your query, but at least I'll give a chance to
others to do so ;-)

Marie Francoise said:

When I compile my code in JAVA, I use the option -Xmx, ie:
java -Xmx200m  moncode,
If I write the 'main' in Jython then I use the command
jython < moncode.py,
I get the following error message:
Out of  Memory. You might want to try the -mx option to increase heap
size.
How do you then pass this parameter in Jython?
END-------------

Any volunteers?

Just as a general rule, people are more likely to reply to you when it's in
English

Cheers,

Karim Yaici

-----Original Message-----
From: jyt...@li...
[mailto:jyt...@li...]On Behalf Of Marie
Francoise Robeau
Sent: 04 March 2002 12:57
To: jyt...@li...
Subject: [Jython-users] Besoins de memoire a l'exécution


Lorsque je lance mon code en JAVA j'utilise l'option -Xmx :
java -Xmx200m  moncode.
Si j'icris mon main en Jython et que je lance la commande
jython < moncode.py,
j'obtiens le message :
Out of  Memory. You might want to try the -mx option to increase heap
size.
Comment passer ce paramhtre ` Jython?


_______________________________________________
Jython-users mailing list
Jyt...@li...
https://lists.sourceforge.net/lists/listinfo/jython-users

[Jython-users] Besoins de memoire a =?iso-8859-1?Q?l=27ex=E9cution?=

[Marie F. R. <mr...@ce...>]

Lorsque je lance mon code en JAVA j'utilise l'option -Xmx :
java -Xmx200m  moncode.
Si j'écris mon main en Jython et que je lance la commande
jython < moncode.py,
j'obtiens le message :
Out of  Memory. You might want to try the -mx option to increase heap
size.
Comment passer ce paramètre à Jython?

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Re: [Jython-users] import jar, classes not seen by jython

[Ype K. <yk...@xs...>]

Fred,

>I have a .jar build with jdk 1.3
>
>I'm running jython21 installed under jdk1.4.
>
>when I try to import my jar, I can see the jar and a dir of the imported
>package shows all the classes.
>
>But I cannot instantiate or otherwise reference the package. 

You cannot instantiate a package, jython has already done that for you.
When this works:

  import your
  dir(your.package)

you should be able to do this:

  yourFooObj = your.package.someClassFooAsShowedByDir()

Hope this helps,
Ype

-- 

Re: [Jython-users] Threads

[Kevin B. <kb...@ca...>]

Stephen Naicken wrote:
> 
> I'm not sure as to how to go about threading a jython program.  I am
> trying to use from java.lang import Thread, extending the Thread class
> and overriding thr run method.  However, when I do this in jython, I get
> an error telling me the __call__ attribute has not been set.

As a design principle, it is often better to implement Runnable rather than extending Thread (you have Runnable jobs to do, rather than anything that would change the semantics of a Thread).

> If anyone can provide a small example of how to create a threaded app in
> jython I would be very grateful.

Four small examples (Jython tends to violate Python's "one obvious way to do it" principle), ordered as Python over Java, then preferred over less preferred:

def greet( name ):
    print "greetings", name

count = 0

# newer Python way
import threading
count += 1
t = threading.Thread(
    target=greet,
    name="MyThread %d" % count,
    args=( "threading.Thread", )
    )
t.start()

# older Python way
# has no thread naming feature
import thread
thread.start_new_thread(
    greet,
    ( "thread.start_new_thread", )
    )

# preferred Java way
from java.lang import Thread, Runnable
class GreetJob( Runnable ):
    def __init__( self, name ):
        self.name = name
    def run( self ):
        greet( self.name )
count += 1
t = Thread( GreetJob( "Runnable" ), "MyThread %d" % count )
t.start()

# other Java way
from java.lang import Thread
class GreetThread( Thread ):
    def __init__( self, name, count ):
        Thread.__init__( self, "MyThread %d" % count )
        self._name = name  # Thread has a 'name' attribute
    def run( self ):
        greet( self._name )
count += 1        
t = GreetThread( "Thread subclass", count )
t.start()

*whew*

BTW, the thread naming stuff is good practice but not required.

kb

[Jython-users] Threads

[Stephen N. <ste...@co...>]

I'm not sure as to how to go about threading a jython program.  I am
trying to use from java.lang import Thread, extending the Thread class
and overriding thr run method.  However, when I do this in jython, I get
an error telling me the __call__ attribute has not been set.

If anyone can provide a small example of how to create a threaded app in
jython I would be very grateful.

Thanks

Stephen

RE: [Jython-users] Trouble with getting to EJB

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

Mike,

The behaviour you are seeing from JBoss and zxJDBC is expected and
correct.  I'll try to explain why and hopefully provide a couple
solutions/suggestions to help you out.

First, zxJDBC doesn't really have anything to with EJBs.  While both
EJBs and zxJDBC can access JNDI they have no relation to each other.
zxJDBC understands how to connect to database from a JNDI lookup that
results in a DataSource or other JDBC object
(ConnectionPooledDataSource, Driver, ...) but can't do anything with
EJBs.  It is often the case that JNDI is used without ever deploying an
EJB, such as when using JMS.

The next thing is to look at what is stored in JNDI and who can access
it.  JBoss binds the DataSource in the 'java:' namespace, which as this
thread
(http://www.mail-archive.com/jbo...@li.../msg12942.h
tml) explains, is available only inside the vm.

So the reason your access to 'java:/jdbc/WP30' fails is because you are
running in another VM (I'm making an assumption here given by the
command prompts in your email).  The reason your EJB can access this
JNDI bound object is because it's part of the container and therefore
can see it.  The JBoss JNDI server is simply denying zxJDBC access to
anything bound under java: as this is intended behaviour.

To prove this try the following code snippet:

 import java
 from javax.naming import *

 env = java.util.Hashtable()
 
env.put(Context.INITIAL_CONTEXT_FACTORY,"org.jnp.interfaces.NamingContex
tFactory")
 env.put(Context.PROVIDER_URL, "localhost")
 env.put(Context.URL_PKG_PREFIXES,"org.jboss.naming:org.jnp.interfaces")

 ctx = InitialContext(env)
 enum = ctx.list("/")
 while enum.hasMoreElements():
  print " -- " + enum.nextElement().getName()

When I run this against my JBoss 2.4.4 instance I see:

 -- XAConnectionFactory
 -- jmx:mountain:rmi
 -- TopicConnectionFactory
 -- UserTransactionSessionFactory
 -- RMIXAConnectionFactory
 -- QueueConnectionFactory
 -- topic
 -- queue
 -- ConnectionFactory
 -- RMIConnectionFactory
 -- UserTransaction
 -- jmx
 -- servercollector
 -- UILXAConnectionFactory
 -- UILConnectionFactory

Notice the 'java:' namespace is not visible.  You'll be unable to access
the connection externally even though your EJB (running internally) sees
it just fine.

If you're looking to just store a DataSource in JNDI you could try
something like this (it's how I test zxJDBC and on occasion I run zxJDBC
this way):

 import java, org
 from javax.naming import *
 from com.ziclix.python.sql import zxJDBC as zx

 env = java.util.Hashtable()
 
env.put(Context.INITIAL_CONTEXT_FACTORY,"org.jnp.interfaces.NamingContex
tFactory")
 env.put(Context.PROVIDER_URL, "localhost")
 env.put(Context.URL_PKG_PREFIXES,"org.jboss.naming:org.jnp.interfaces")

 ctx = InitialContext(env)

 ds = org.gjt.mm.mysql.MysqlDataSource()
 ds.setServerName("192.168.1.102")
 ds.setDatabaseName("ziclix")
 ds.setUser("jython")
 ds.setPassword("jython")
 ds.setPort(3306)
 conn = ds.getConnection()
 conn.close()
 print
 print "opened connection from ds: %s" % (str(ds))

 try:
  ctx.bind("mysql", ds)
 except NameAlreadyBoundException:
  pass

 db = zx.lookup("mysql",
  INITIAL_CONTEXT_FACTORY="org.jnp.interfaces.NamingContextFactory",
  PROVIDER_URL="localhost",
  URL_PKG_PREFIXES="org.jboss.naming:org.jnp.interfaces"
 )

 print
 print db

 db.close()

 ctx.unbind("mysql")

 ctx.close()

This script creates a DataSource (could be a ConnectionPooledDataSource
as well (also note that each vendor's DataSource is slightly different
in terms of set/get API)) and binds the instance.  zxJDBC's lookup() is
then able to find the DataSource and create a connection.  If you re-run
the first code snippet without unbinding mysql you should see it in the
list.

Additionally, if you embed Jython in the EJB container and use the
embedded interpreter to accces zxJDBC and JNDI resources your original
attempt should work just fine.  This approach is also possible for using
zxJDBC in conjunction with PyServlet.

I hope this helps.  If you have any more questions please let me know.

thanks,

brian


> -----Original Message-----
> From: jyt...@li... 
> [mailto:jyt...@li...] On Behalf 
> Of Mike Hostetler
> Sent: Thursday, February 28, 2002 9:54 AM
> To: jyt...@li...
> Subject: [Jython-users] Trouble with getting to EJB
> Importance: High
> 
> 
> Hello,
> 
> I'm trying to use Jython to get to some EJB objects via JBoss 
> 2.2 and having very little luck.  I can get to the database 
> from another application (that also uses the EJB, but is 
> Java) so I know that it is being deployed properly.
> 
> According to the JBoss startup, my database is being deploy thus:
> 		  [jdbc/WP30] Starting
> 		  [jdbc/WP30] XA Connection pool jdbc/WP30 
> bound to java:/jdbc/WP30
> 		  [jdbc/WP30] Started
> 
> But when I try to get at it via zxODBC, it doesn't work:
> 		  >>> from com.ziclix.python.sql import zxJDBC
> 		  >>> jndi = "jdbc/WP30"
> 		  >>> db = zxJDBC.lookup(jndi)
> 		  Traceback (innermost last):
> 			 File "<console>", line 1, in ?
> 		  DatabaseError: jdbc not bound 
> 
> And there is a jndi.properties file in that directory, and 
> Jython is reading it.  I know this because if I muck with it, 
> it give me an error:
>  
> original jndi.properties:
> 		  
> java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory
> 		  java.naming.provider.url=localhost
> 		  
> java.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfaces
> 
> messed-up jndi.properties:
> 		  
> java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory
> 		  java.naming.provider.url=fred://localhost
> 		  
> java.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfaces
> 
> Run with bad jndi.properties:
> 		  >>> from com.ziclix.python.sql import zxJDBC
> 		  >>> jndi = "jdbc/WP30"
> 		  >>> db = zxJDBC.lookup(jndi)
> 		  Traceback (innermost last):
> 			 File "<console>", line 1, in ?
> 		  DatabaseError: fred
> 
> Now, I am totally lost.  What could the problem be?  Is there 
> any suggestions?
> 
> -- mikeh
> 
> -- 
> 
> _______________________________________________
> Jython-users mailing list
> Jyt...@li...
> https://lists.sourceforge.net/lists/listinfo/jython-users
> 

Re: [Jython-users] freezing an application with pythonc? Do Python packages work?

[Samuele P. <pe...@in...>]

From: Bill Janssen <ja...@pa...>
> Thanks for the workaround.  Should I report the bug, or is it already in the
bugs DB?
>

No it is not there, but I have already analyzed it and I will take care.

Thanks, Samuele Pedroni.

Re: [Jython-users] freezing an application with pythonc? Do Python packages work?

[Bill J. <ja...@pa...>]

Thanks for the workaround.  Should I report the bug, or is it already in the bugs DB?

Bill

Re: [Jython-users] Why is self used so much

[Doug L. <lan...@go...>]

>... wondering why it seems that every variable used has to
>have self prefixed to it.

Global and local variables do not require the "self." prefix;
it is only members -- aka instance variables -- and methods
that require this.

>I'd just like to know why this is needed or if im doing something wrong.

Or both!  (Your error is not capitalizing the "I" and omitting
the apostrophe.  Mine is in pointing that out.  You're welcome...)


See http://www.python.org/doc/Humor.html#zen ... the second item says

   Explicit is better than implicit.

That's the guiding principle for why this part of the language
was designed this way.

   channeling-the-Tim-bot-channeling-Guido-ly,
     -- Doug

Re: [Jython-users] bsddb module

[Stephen N. <ste...@co...>]

Slightly off topic from jython, but does the berekely db java interface
support version 1.85 if conifgured with the 1.85 compatablity?

On Thu, 21 Feb 2002, Jeff Emanuel wrote:

> 
> 
> You can find a Java interface to Berkeley DB which you can access
> directly from jython.  Feed this to google  "berkeley db java"
> 
> 
> Stephen Naicken wrote:
> 
> > I have an application in python that requires the use of the bsddb
> > module to extract information from the mozilla 0.92 cache database,
> > cache.db.  I would like to port this application to jython, but the
> > bsddb module is not available.  What alternatives do i have?
> > 
> > Thanks 
> > 
> > Stephen
> > 
> > 
> > _______________________________________________
> > Jython-users mailing list
> > Jyt...@li...
> > https://lists.sourceforge.net/lists/listinfo/jython-users
> > 
> 
> 
> 
> _______________________________________________
> Jython-users mailing list
> Jyt...@li...
> https://lists.sourceforge.net/lists/listinfo/jython-users
> 

Re: [Jython-users] OSError: [Errno 0] chdir not supported in Java?

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

 >What I'd suggest is some sort of collection of "porting stories"
 >(Python to Jython) and/or issues to expect when doing this kind
 >of thing. I'm not sure the FAQ is the best place for that, but
 >maybe I'm wrong.

I think a "porting FAQ", whether integrated with the main
FAQ or not, is always a good idea.  It provides a way to
capture particular issues that maybe don't belong in the
main docs, but still can save folks some time if documented
somewhhere.

[Jython-users] import jar, classes not seen by jython

[Sells, F. <fr...@ad...>]

I have a .jar build with jdk 1.3

I'm running jython21 installed under jdk1.4.

when I try to import my jar, I can see the jar and a dir of the imported
package shows all the classes.

But I cannot instantiate or otherwise reference the package.  

This problem is familiar, but I've searched for it without luck.  

Could I get a little help please

[Jython-users] Trouble with getting to EJB

[Mike H. <th...@bi...>]

Hello,

I'm trying to use Jython to get to some EJB objects via JBoss 2.2 and
having very little luck.  I can get to the database from another
application (that also uses the EJB, but is Java) so I know that it is
being deployed properly.

According to the JBoss startup, my database is being deploy thus:
		  [jdbc/WP30] Starting
		  [jdbc/WP30] XA Connection pool jdbc/WP30 bound to java:/jdbc/WP30
		  [jdbc/WP30] Started

But when I try to get at it via zxODBC, it doesn't work:
		  >>> from com.ziclix.python.sql import zxJDBC
		  >>> jndi = "jdbc/WP30"
		  >>> db = zxJDBC.lookup(jndi)
		  Traceback (innermost last):
			 File "<console>", line 1, in ?
		  DatabaseError: jdbc not bound 

And there is a jndi.properties file in that directory, and Jython is
reading it.  I know this because if I muck with it, it give me an error:
 
original jndi.properties:
		  java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory
		  java.naming.provider.url=localhost
		  java.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfaces

messed-up jndi.properties:
		  java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory
		  java.naming.provider.url=fred://localhost
		  java.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfaces

Run with bad jndi.properties:
		  >>> from com.ziclix.python.sql import zxJDBC
		  >>> jndi = "jdbc/WP30"
		  >>> db = zxJDBC.lookup(jndi)
		  Traceback (innermost last):
			 File "<console>", line 1, in ?
		  DatabaseError: fred

Now, I am totally lost.  What could the problem be?  Is there any
suggestions?

-- mikeh

-- 

Re: [Jython-users] code in emails

[<do...@fi...>]

Folks,

Please try to avoid using 3 consecutive X's in any code samples as some
email monitoring software views this as adult content and flags the email
for system administrator review.   The code below in which I replaced two
X's with periods was the culprit on our system.


Properties are diffrent. X..
>     sys.argv[0]
>     loading of python classes.


Thanks.


Doug

Re: [Zope] Re: [Jython-users] Jython and Zope

[Jeff M. <je...@mk...>]

If you look at the documentation
http://java.sun.com/j2se/1.3/docs/api/java/io/Serializable.html it
details this. Basically java uses two private methods.

private void writeObject(java.io.ObjectOutputStream out)
     throws IOException

and

private void readObject(java.io.ObjectInputStream in)
     throws IOException, ClassNotFoundException;
 
to handle serialization. You can implement you own versions of these
methods on an object so that the jvm uses these to serialize/deserialize
the object. This mean that when you do

o = new ObjectOutputStream(new FileOutputStream(filename));
o.writeObject(myClass);

java uses your o.writeObject to write the object to disk. You can then
use any format you wish to describe the object. If you represent you
object as a byte array you should be able to read this array into pyhon
and populate a python object using this data.

 
On Wed, 2002-02-27 at 21:47, Nicolas Bill Russell wrote:
> 
>  Really? Could you please explain in detail. :)
> o = new ObjectOutputStream(new FileOutputStream(filename));
> o.writeObject(myClass); (?)
> Isn't the syntax of Python classes different from Java?
> Thanks,
> Bill Nicolas
>   Jeff Martin <je...@mk...> wrote: You could try implementing the readObject and writeObject methods on
> your java object. This would allow you to control the format into which
> they are serialized so you can interpret in in python.
> 
> 
> On Tue, 2002-02-26 at 21:31, Nicolas Bill Russell wrote:
> > 
> > The reason why I want to use Jython is that I need to access serialized Java objects.
> > I've designed a system that uses objects as the main storage media rather than databases. I used Java for the frontend of my system (Swing GUIs and object serialization) and is planning to use Python (Jython) for client-side processing of Java objects.
> > Is there any other (simpler) way to access Java objects using Python?
> > Thanks,
> > Bill Russell Gagalac-Nicolas
> > 
> > 
> > 
> > ---------------------------------
> > Do You Yahoo!?
> > Get personalised at My Yahoo!.
> -- 
> 
> 
> 
> ---------------------------------
> Do You Yahoo!?
> Get personalised at My Yahoo!.
-- 

RE: [Jython-users] Example of Java class reloading

[Gustav B. <Gus...@eo...>]

Hi! I'm still not getting this to work. Now I get another error-message:

Traceback (innermost last):   File "<console>", line 1, in ?   File =
"v:\eonworx_testbed\gubos\src\python\python-geAamB", line 14, in =
runHello java.lang.IllegalAccessException
 	at java.lang.reflect.Constructor.newInstance(Native Method)
 	at =
org.python.core.PyReflectedConstructor.__call__(PyReflectedConstructor.ja=
va)
 	at org.python.core.PyJavaInstance.__init__(PyJavaInstance.java)
 	at org.python.core.PyJavaClass.__call__(PyJavaClass.java)
 	at org.python.core.PyObject.__call__(PyObject.java)
 	at =
org.python.pycode._pyx2.runHello$2(v:\eonworx_testbed\gubos\src\python\py=
thon-geAamB:14)
 	at =
org.python.pycode._pyx2.call_function(v:\eonworx_testbed\gubos\src\python=
\python-geAamB)
 	at org.python.core.PyTableCode.call(PyTableCode.java)
 	at org.python.core.PyTableCode.call(PyTableCode.java)
 	at org.python.core.PyFunction.__call__(PyFunction.java)
 	at org.python.pycode._pyx3.f$0(<console>:1)
 	at org.python.pycode._pyx3.call_function(<console>)
 	at org.python.core.PyTableCode.call(PyTableCode.java)
 	at org.python.core.PyCode.call(PyCode.java)
 	at org.python.core.Py.runCode(Py.java)
 	at org.python.core.Py.exec(Py.java)
 	at org.python.util.PythonInterpreter.exec(PythonInterpreter.java)
 	at =
org.python.util.InteractiveInterpreter.runcode(InteractiveInterpreter.jav=
a)
 	at =
org.python.util.InteractiveInterpreter.runsource(InteractiveInterpreter.j=
ava)
 	at =
org.python.util.InteractiveInterpreter.runsource(InteractiveInterpreter.j=
ava)
 	at org.python.util.InteractiveConsole.push(InteractiveConsole.java)
 	at =
org.python.util.InteractiveConsole.interact(InteractiveConsole.java)
 	at org.python.util.jython.main(jython.java)
  java.lang.IllegalAccessException: java.lang.IllegalAccessException

What could be causing this?
My classpath does not contain the Hello class (I checked with :
>>> for path in System.getProperty("java.class.path").split(";"):
...	print path)

I've been getting this error when I try to use sys.add_extdir too. I =
never seem to get this dynamic loading of Java-classes to work. I must =
be doing something very wrong.

/Gustav



-----Original Message-----
From: Samuele Pedroni [mailto:pe...@in...]
Sent: Wednesday, February 27, 2002 6:15 PM
To: Gustav Bostrom; Jython (E-mail)
Subject: Re: [Jython-users] Example of Java class reloading


Example of Java class reloadingHi

From: Gustav Bostrom

>Hi!
>I'm struggling to get the Java-class reloading to work.
>I'm not very succesful.
>Does anyone have a good example to share?
>I tried this, but it didn't work:
>import jreload
>classpath=3D["V:\\eonworx\\output\\contrib\\studio\\classes"]
>classesLoadSet=3Djreload.makeLoadSet("classes",classpath)
>print classesLoadSet
>from classes import Hello
>jreload.reload(classesLoadSet)

you don't need this jreload.reload call

>def rl():
>    jreload.reload(classesLoadSet)
>def runHello():
>   Hello().sayHello()
>
> When I run rl() the Hello-class is still not reloaded and runHello() =
still
produces the old result.

Assuming that you have changed the class before calling rl() <wink>, the =
code
seems correct.

The Jython Demo/jreload directory contains the artifacts to run the =
interactive
session example
in Doc/jreload.html documentation.

Up to bugs, the only important thing to remember is that the LoadSet =
path
should
be disjunct from classpath and sys.path otherwise reloading will not =
work
(Java limitation).

regards, Samuele Pedroni.

[Jython-users] ¿ì~~¿Í??!! [È«º¸]

[¿ì~~¿Í??!! <tou...@dr...>]

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Re: [Jython-users] How to use the execute() method in javaos

[Oti <oh...@ya...>]

[ Hugh Rodgers ]

> I have been trying to use the javaos.execute() method for
> some time now, unsuccessfully. I basically wanted to do the
> following:
> 
>         import os
>         os.execute( "f:\tests\HelloWorld" )
> 
> where HelloWorld is my compiled and working Java
> application.

Hello Hugh,

please try:
  import os
  os.system( "f:\tests\HelloWorld" )

I believe the execute() method is internal to javaos.py

Best wishes,
Oti.


__________________________________________________
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Re: [Jython-users] freezing an application with pythonc? Do Python packages work?

[Samuele P. <pe...@in...>]

You have encountered a bug,
a workaround is to define
a startup.py:

import TopLevel.mainmodule

and then jythonc --core --deep --jar whatever.jar startup.py

but depending our needs this can be useful or  not.

Let us know.

regards, Samuele Pedroni.


----- Original Message -----
From: Bill Janssen <bi...@ja...>
To: <jyt...@li...>
Sent: Thursday, February 28, 2002 4:17 AM
Subject: [Jython-users] freezing an application with pythonc? Do Python
packages work?


> I've got a fairly large Python application working with Jython, and
> I'd like to generate a jar file so that the application could be run
> with a command-line like
>
>   java -classpath myjarfile.jar TopLevel.mainmodule
>
> This looks pretty easy to do with jythonc, and I've gotten it to work
> on some simple examples.  However my large app does things like
>
>   import TopLevel
>
> from inside TopLevel.mainmodule.  And that doesn't work; I get an
> import error.  I see that the documentation page for jythonc has some
> unfinished sections at the bottom, where it says:
>
>
>   Freezing modules
>
>   jythonc can also be used to freeze a python application. The frozen
>   application can then be distributed and deployed as any other java
>   application.
>
>   Some diffrences between an interpreted application and a frozen
>   application exists:
>
>     Properties are diffrent. XXX
>     sys.argv[0]
>     loading of python classes.
>
>
> Anyone know the specifics of those differences?  I suspect my troubles
> are coming from "loading of python classes".  In particular, I notice
> that if TopLevel contains an __init__.py file, the import fails, but
> if there's no such module, the import succeeds.
>
> Bill
>
> _______________________________________________
> Jython-users mailing list
> Jyt...@li...
> https://lists.sourceforge.net/lists/listinfo/jython-users
>

[Jython-users] freezing an application with pythonc? Do Python packages work?

[Bill J. <bi...@ja...>]

I've got a fairly large Python application working with Jython, and
I'd like to generate a jar file so that the application could be run
with a command-line like

  java -classpath myjarfile.jar TopLevel.mainmodule

This looks pretty easy to do with jythonc, and I've gotten it to work
on some simple examples.  However my large app does things like

  import TopLevel

from inside TopLevel.mainmodule.  And that doesn't work; I get an
import error.  I see that the documentation page for jythonc has some
unfinished sections at the bottom, where it says:


  Freezing modules

  jythonc can also be used to freeze a python application. The frozen
  application can then be distributed and deployed as any other java
  application.

  Some diffrences between an interpreted application and a frozen
  application exists:

    Properties are diffrent. XXX 
    sys.argv[0] 
    loading of python classes. 


Anyone know the specifics of those differences?  I suspect my troubles
are coming from "loading of python classes".  In particular, I notice
that if TopLevel contains an __init__.py file, the import fails, but
if there's no such module, the import succeeds.

Bill