jython-users — Discussion of and questions about using Jython

[Jython-users] Jython on MacOS X?

[Deirdre S. M. <de...@de...>]

All the instructions linked from the Jython page on Macintosh installations
talk about classic MacOS. However, MacOS X is Unix -- and very different.

Has anyone else installed Jython on MacOS X? If so, where did you install it?

I'm sorry to ask trivial questions but:

a) my MacOS X development skills are rusty (part of why I'm doing this)
b) I wanted to see if I could write Jython code that hooked up to Interface
Builder


--
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[Jython-users] implementing an interface (multple inheritance)

[Eric F. <eri...@ny...>]

I would like to integrate some jython into a java source tree.  Some of my
python modules will need to import classes defined in this project, and in
at least one case, I need to implement a jython class with multiple
inheritance from a java class and a java interface.  How must I do this?

Finally, are jython objects serializable?

A demo sourcetree of a trival hybrid jython & java program would be VERY
helpful.

Many thanks, Eric

---
Eric Freudenthal // Courant Institute // New York University
office: 212-998-3345  // cell:917-279-6208
715 Broadway, Room 1011, New York, NY  10003
cell pager: eri...@fr... (100 char limit)

[Jython-users] Adding new path in jython

[Paolo T. <Pao...@ma...>]

Hi.
It's again me.

I followed your istruction and I create a registry file where set up some
properties.

How can I add (and not substitute!) an extra path.
In other words?

In jyhton script I do:
/usr/j2se/jre/bin/java -Dpython.home=${HOME}/.jythonhome -Dpython.path
=/export/skel/omc-user/pythonmodules

And in $HOME/.jythonhome/registry I wrote the following:
python.path=mylocaldir

In this way I just substitute the path.
I would like to know how to add mylocaldir to that is set in command line.
Anyone knows how to do that ?

Thanks in advance.
Paolo.

Re: [Jython-users] Jython PYTHONPATH and PYTHONSTARTUP

[<Ron...@Ne...>]

Jython is Java oriented when it comes to system-related behavior - they
both
   use properties and not environment variable.  See the user notes at the
home page;
look for the info on properties.








"Paolo Tortora" <Pao...@ma...>@lists.sourceforge.net on
04/24/2001 04:39:10 AM

Sent by:  jyt...@li...


To:   jyt...@li...
cc:

Subject:  [Jython-users] Jython PYTHONPATH and PYTHONSTARTUP



Hi

I tried to use PYTHONPATH and PYTHONSTARTUP system variable,
either for looking for importing modules and execute them in interactive
start-up (as explained in python documentation).
Thery doesn't work with jython 2.0.
I also tried to use CLASSPATh for searching modules but doesn't work as
too.
Anyone knows how to do that ?

Thank you.

Paolo.



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[Jython-users] Jython PYTHONPATH and PYTHONSTARTUP

[Paolo T. <Pao...@ma...>]

Hi

I tried to use PYTHONPATH and PYTHONSTARTUP system variable,
either for looking for importing modules and execute them in interactive
start-up (as explained in python documentation).
Thery doesn't work with jython 2.0.
I also tried to use CLASSPATh for searching modules but doesn't work as too.
Anyone knows how to do that ?

Thank you.

Paolo.

[Jython-users] Re: Distribution (ignore last post)

[Adam B. <sir...@ya...>]

Blech... where's that unsend button! Unsend! Unsend!

Yeah. I see. Ignore me. Please?

Adam

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[Jython-users] Distribution

[Adam B. <sir...@ya...>]

Is there a reason that Jython is not available as a
single .jar file, perhaps with seperate documentation?
In terms of incorporating it into another project, it
is much simpler (and more graceful) to add a jar to a
classpath than to deal with getting the source,
compiling it, and having it clog both your sourcepath
and classpath with many files. While I understand the
desire to ship source, so that users can see it / help
with it (and, indeed, I hope to contribute about a few
points soon), it is easier for the end user if there
is a jar option. Thoughts?

Adam

Also, it's entirely possible I'm just missing it, and
it's sitting right on the server somewhere. If so, I
deserve to be flamed, but flame me nicely, it's late. :-)

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Re: [Jython-users] Jython/Thinking in Patterns Question

[Jim A. <ji...@tr...>]

Uncle Roastie wrote:

> Question:  On pages 9.21 and 9.23 you show how
> to use "glob()" in Jython, and then you add that it
> is not part of the standard Jython package.

Fresh jython 2.1a1 on Win98, no C-Python:

>>> from glob import glob
>>> glob("*.*")
['LICENSE.txt', 'README.txt', 'jython.jar', 'jython.bat', 'jythonc.bat',
'Uninst
all.class', 'console.bat']

Bruce Eckel may have been using an earlier version?


-- 
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Jim Adrig                      _ \<,_
ji...@tr...          ' `/ ' `
                  ___________ `-'  `-'


"There are many ways of moving forward,
 but only one way of standing still."
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RE: [Jython-users] Jython variable scope

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

Paolo,

The problem is you have not defined Count to be global in set() so a lccal variable called Count is being set with the value of
newrc, not the top level variable as you expected.  To fix it:

def set(newc):
	global Count
	Count = newc

However, this is considered very bad practice.  Instead, try to build a class which contains the state, such as:

class Counter:
	def __init__(self):
		self.count = 0

c = Counter()
print c.count
c.count = 5
print c.count

While this is a bit bigger step conceptually, it will pay dividends as the scoping will be much easier to maintain.

hope this helps,

brian

>
> Hi.
>
> I have some problem to set a moduel variable into a function.
>
> I worte the following python module:
>
> ##Module mymodule.py
>
> Count = 0
>
> def get():
>      return Count
>
> def set(newc):
>      Count = newc
>
>
> >From prompt I type:
> >>> import mymodule
> >>> mymodule.get()
> 0
> >>> mymodule.set(5)
> >>> mymodule.get()
> 0
>
> I was expecting 5 !
>
> Anyone knows my mistake ?
>
> Thank you in advance.
> Paolo.

Re: [Jython-users] Jython variable scope

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

Hi.

[Paolo Tortora]
> Hi.
> 
> I have some problem to set a moduel variable into a function.
> 
> I worte the following python module:
> 
> ##Module mymodule.py
> 
> Count = 0
> 
> def get():
>      return Count
> 
> def set(newc):
>      Count = newc
In python (this is not jython specific) an assignment in a function implicitly
declare the assigned var as *local* to the function

def set(newc):
 Count = newc # implicilty declare a local Count var (unrelated to global one)
 
If you want to change a global var you should be explicit about that:

def set(newc):
 global Count
 Count = newc
 
regards

[Jython-users] Jython variable scope

[Paolo T. <Pao...@ma...>]

Hi.

I have some problem to set a moduel variable into a function.

I worte the following python module:

##Module mymodule.py

Count = 0

def get():
     return Count

def set(newc):
     Count = newc


From prompt I type:
>>> import mymodule
>>> mymodule.get()
0
>>> mymodule.set(5)
>>> mymodule.get()
0

I was expecting 5 !

Anyone knows my mistake ?

Thank you in advance.
Paolo.

Re: [Jython-users] Jython/Thinking in Patterns Question

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

[Uncle Roastie]

>I'm operating under the impression that JPython cannot use CPython code.

That depends on the module. Most modules works with both Jython and
CPython.

>Brian Zimmer's additional comment suggests the same thing that
>John Mudd says - just import glob from CPython.

Correct. In fact the glob.py module distributed with Jython-2.0 is a
binary copy taken from CPython-2.0

>There is something conceptually that I'm missing here.
>Why isn't something like the CPython glob module a part of
>the JPython distribution 

It is. It will be installed when the "Library modules" checkbox is
selected during installation.

>if they can interoperate?  Are we expected to
>have both distributions on our search paths -

No. By default the installation will install a selfcontained jython
environment. Some users with more advanced requirements can have both
distributions on the search path.

>but then, if that is
>the case, why does JPython duplicate so much of CPython?

???

What are you saying here? A major part of the CPython standard library
is distributed with Jython exactly because that part works with Jython.

>There is some missing concept here that I haven't pick up on.
>I don't think JPython and CPython are meant to interoperate.

Yes they are. To the fullest extend possible.

>Bruce Eckels says in his excellent "Thinking in Patterns" that
>you can use things like the glob module,  but where does it come from,
>since it's not in JPython/Jython, 

It is in Jython-2.0.

>and I'm still making the assumption
>that CPython and JPython do not interoperate?

Not all CPython modules can work in jython. Some modules depend on
dll/.so extension, others depend on the CPython implementation such as
the Python byte codes and yet other modules fails because of bugs in
Jython.

>I think the answer hasn't been made yet, which is why I'm still asking
>questions.

I hope the question have been answered now.

regards,
finn

Re: [Jython-users] Jython/Thinking in Patterns Question

[John M. <joh...@ya...>]

The JPython (not Jython) page suggests installing the CPython 1.5.2
libs.  See: http://www.jpython.org/download.html  I'm not sure if this
is still necessary though.

(1) Download pylib152e.jar
(2) jython -jar pylib152e.jar


--- Uncle Roastie <ro...@ro...> wrote:
> I'm operating under the impression that JPython cannot use CPython
> code.
> Brian Zimmer's additional comment suggests the same thing that
> John Mudd says - just import glob from CPython.
> 
> There is something conceptually that I'm missing here.
> Why isn't something like the CPython glob module a part of
> the JPython distribution if they can interoperate?  Are we expected
> to
> have both distributions on our search paths - but then, if that is
> the case, why does JPython duplicate so much of CPython?
> 
> There is some missing concept here that I haven't pick up on.
> I don't think JPython and CPython are meant to interoperate.
> Bruce Eckels says in his excellent "Thinking in Patterns" that
> you can use things like the glob module,  but where does it come
> from,
> since it's not in JPython/Jython, and I'm still making the assumption
> that CPython and JPython do not interoperate?
> 
> I think the answer hasn't been made yet, which is why I'm still
> asking
> questions.
> 
> 
> 
> ----- Original Message ----- 
> From: John Mudd <joh...@ya...>
> To: Uncle Roastie <ro...@ro...>
> Sent: Sunday, April 22, 2001 12:08 PM
> Subject: Re: [Jython-users] Jython/Thinking in Patterns Question
> 
> 
> > I seem to be able to access glob.  You can't?  Maybe I installed
> the
> > python 1.5.2 libs.
> > 
> > $ jython
> > Jython 2.1a1 on java1.2.2-RC2 (JIT: javacomp)
> > Type "copyright", "credits" or "license" for more information.
> > >>> import glob
> > >>> dir(glob)
> > ['__all__', '__doc__', '__file__', '__name__', 'fnmatch', 'glob',
> > 'glob1', 'has_magic', 'magic_check', 'os', 're']
> > >>> 
> > 
> > --- Uncle Roastie <ro...@ro...> wrote:
> > > Bruce,
> > > 
> > > "Thinking in Patterns", chapter 9 on the Jython interpreter,
> > > has been invaluable to me at work.
> > > 
> > > Question:  On pages 9.21 and 9.23 you show how
> > > to use "glob()" in Jython, and then you add that it
> > > is not part of the standard Jython package.
> > > 
> > > So, where can we find this beast?
> > > And any other similar furry creatures that might exist.
> > > 
> > > Thanks,
> > > 
> > > Ron
> > > 
> > > ron...@ne... (W)
> > > ro...@ro...      (H)
> > >  
> > > 
> > 
> > 
> > __________________________________________________
> > Do You Yahoo!?
> > Yahoo! Auctions - buy the things you want at great prices
> > http://auctions.yahoo.com/
> > 
> 


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Re: [Jython-users] Jython/Thinking in Patterns Question

[Uncle R. <ro...@ro...>]

I'm operating under the impression that JPython cannot use CPython code.
Brian Zimmer's additional comment suggests the same thing that
John Mudd says - just import glob from CPython.

There is something conceptually that I'm missing here.
Why isn't something like the CPython glob module a part of
the JPython distribution if they can interoperate?  Are we expected to
have both distributions on our search paths - but then, if that is
the case, why does JPython duplicate so much of CPython?

There is some missing concept here that I haven't pick up on.
I don't think JPython and CPython are meant to interoperate.
Bruce Eckels says in his excellent "Thinking in Patterns" that
you can use things like the glob module,  but where does it come from,
since it's not in JPython/Jython, and I'm still making the assumption
that CPython and JPython do not interoperate?

I think the answer hasn't been made yet, which is why I'm still asking
questions.



----- Original Message ----- 
From: John Mudd <joh...@ya...>
To: Uncle Roastie <ro...@ro...>
Sent: Sunday, April 22, 2001 12:08 PM
Subject: Re: [Jython-users] Jython/Thinking in Patterns Question


> I seem to be able to access glob.  You can't?  Maybe I installed the
> python 1.5.2 libs.
> 
> $ jython
> Jython 2.1a1 on java1.2.2-RC2 (JIT: javacomp)
> Type "copyright", "credits" or "license" for more information.
> >>> import glob
> >>> dir(glob)
> ['__all__', '__doc__', '__file__', '__name__', 'fnmatch', 'glob',
> 'glob1', 'has_magic', 'magic_check', 'os', 're']
> >>> 
> 
> --- Uncle Roastie <ro...@ro...> wrote:
> > Bruce,
> > 
> > "Thinking in Patterns", chapter 9 on the Jython interpreter,
> > has been invaluable to me at work.
> > 
> > Question:  On pages 9.21 and 9.23 you show how
> > to use "glob()" in Jython, and then you add that it
> > is not part of the standard Jython package.
> > 
> > So, where can we find this beast?
> > And any other similar furry creatures that might exist.
> > 
> > Thanks,
> > 
> > Ron
> > 
> > ron...@ne... (W)
> > ro...@ro...      (H)
> >  
> > 
> 
> 
> __________________________________________________
> Do You Yahoo!?
> Yahoo! Auctions - buy the things you want at great prices
> http://auctions.yahoo.com/
> 

RE: [Jython-users] Jython/Thinking in Patterns Question

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

Ron,

glob() is available in the glob module which comes with the standard CPython
distribution.  If you have CPython available, just add the \Lib directory to
your python.path registry value.

I don't know if it's possible to get just the CPython libraries or not, but
it doesn't hurt to have both Python implementations available.

brian
  -----Original Message-----
  From: jyt...@li...
[mailto:jyt...@li...]On Behalf Of Uncle Roastie
  Sent: Saturday, April 21, 2001 11:12 PM
  To: br...@ec...
  Cc: jyt...@li...
  Subject: [Jython-users] Jython/Thinking in Patterns Question


  Bruce,

  "Thinking in Patterns", chapter 9 on the Jython interpreter,
  has been invaluable to me at work.

  Question:  On pages 9.21 and 9.23 you show how
  to use "glob()" in Jython, and then you add that it
  is not part of the standard Jython package.

  So, where can we find this beast?
  And any other similar furry creatures that might exist.

  Thanks,

  Ron

  ron...@ne... (W)
  ro...@ro...      (H)

[Jython-users] Jython/Thinking in Patterns Question

[Uncle R. <ro...@ro...>]

Bruce,

"Thinking in Patterns", chapter 9 on the Jython interpreter,
has been invaluable to me at work.

Question:  On pages 9.21 and 9.23 you show how
to use "glob()" in Jython, and then you add that it
is not part of the standard Jython package.

So, where can we find this beast?
And any other similar furry creatures that might exist.

Thanks,

Ron

ron...@ne... (W)
ro...@ro...      (H)
=20

RE: [Jython-users] Running auto-discovered methods

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

Scott,

Here's an example of what I think you are looking for (it works equally well on a [Java|Python] [class|instance]:

>>> class Test:
...  def go(self):
...   print "invoked go"
...  def went(self):
...   print "invoked went"
...
>>> t = Test()
>>> dir(t.__class__)
['__doc__', '__module__', 'go', 'went']
>>> for a in dir(t.__class__):
...  if a[0:2] <> "__":
...   getattr(t, a)()
...
invoked go
invoked went
>>>

Notice the line:

 getattr(t, a)()

The built-in 'getattr' retuns a method bound on the instance t, similar to a Method object in Java.  In Java, to execute the Method,
you would call:

 m.invoke(instance, params)

in Python you use the callable nature of objects and invoke it by:

 m(params)

since the method is already bound to the instance you don't need to pass it as a param as you do in Java since in Java the Method is
always bound to the class, not an instance.

For a more indepth look at when the method is bound to an instance and when to a class:

>>> getattr(Test, "go")
<unbound method Test.go>
>>> getattr(t, "go")
<method Test.go of Test instance at 3335245>
>>> getattr(Test, "go")(t)
invoked go
>>> getattr(t, "go")()
invoked go
>>>

Notice that when I get the method from the class, I need to pass an instance to invoke it, fulfilling the contract for sending a
'self' argument.

Also note that neither go() or went() required arguments in my example.  If you really want to blindly invoke methods you'll need to
figure out if they require arguments.  In general, the invoker knows the arguments required, such as the callback in os.path.walk().

You might want to check out this as well:

http://www.diveintopython.org/apihelper_getattr.html

hope this helps,

brian

> -----Original Message-----
> From: jyt...@li...
> [mailto:jyt...@li...]On Behalf Of Scott
> Knight
> Sent: Saturday, April 21, 2001 7:52 AM
> To: jython
> Subject: [Jython-users] Running auto-discovered methods
>
>
> A few days ago, Neil Benn queried "Self Describing Scripts in Jython"
> and appears to be wanting to do something similar to what I need:
> something analogous to Java's Reflection.  I can easily get a list of
> the method names in a class.  I can't figure out how to invoke the
> method given it's name in string form.  What I am really after is to
> cycle through all of the method names in the list and run them all,
> rather than type up a method that calls each of a couple hundred methods
> statically.
> --
> Scott Knight  mailto:sc...@sc...
> http://www.scottknight.com/
>
> _______________________________________________
> Jython-users mailing list
> Jyt...@li...
> http://lists.sourceforge.net/lists/listinfo/jython-users

[Jython-users] Running auto-discovered methods

[Scott K. <sc...@sc...>]

A few days ago, Neil Benn queried "Self Describing Scripts in Jython"
and appears to be wanting to do something similar to what I need:
something analogous to Java's Reflection.  I can easily get a list of
the method names in a class.  I can't figure out how to invoke the
method given it's name in string form.  What I am really after is to
cycle through all of the method names in the list and run them all,
rather than type up a method that calls each of a couple hundred methods
statically.
-- 
Scott Knight  mailto:sc...@sc...
http://www.scottknight.com/

Re: [Jython-users] Query

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

Adam,
you wrote:
>Hello,
>  I'm new to jython, and I have a rather ornate
>question about its capabilities, that I have not been
>able to determine the answer to by reading docs. I am
>looking to supplement my program with a
>very-high-level language to aid development in a
>certain region. Ideally, the language would be able to
>satisfy the following characteristics
>
>1) Extend java classes (note that these classes will
>be leaves in my inheritence tree; java does not need
>to be able to extend my jython classes)

Make sure your java classes are on the class path when
invoking Jython. Then use the following Jython code:

import yourpackage

someobj = yourpackage.yourclass()

class subclass(yourpackage.yourclass):
    pass

etc.

>2) Run in interpretted mode, reading from a text file
>(that is, without compilation)
>
>3) Have the same class compile 'dynamically' down to
>java bytecode (note that this can take several
>seconds, it must merely be possible)

You get both in one go. When a jython module is loaded
an internal java class is (quite quickly) built to represent the module.
This class is also saved for further use.
The Jython function execfile() does all of this, you can also
do it directly from your own Java code.

>4) Reload compiled classes if they are redefined

You can drop modules from sys.modules and reimport them.
This might leave the old java classes in memory, though.
For serious stuff have a look at:

http://jython.sourceforge.net/docs/jreload.html

You'll need Java 1.2 for best reloading.
In any case you will have to detect the need for
reloading yourself (the linecache module is a nice
example).

>How much of this is possible with Jython as it
>currently stands? How much of this is possible within
>the Jython framework, in an ideal world (that is, if I
>was to look at implementing it myself)? Are there
>other languages I should be looking at?

Apart from reloading: 100%.
Reloading takes some involvement, but you probably
can get a satisfactory result.
Other languages: there are other scripting languages
in Java, but I have no experience with them.
In case you need references let me know.

>I thank you in advance,

My pleasure.

Ype Kingma

[Jython-users] Query

[Adam B. <sir...@ya...>]

Hello,
  I'm new to jython, and I have a rather ornate
question about its capabilities, that I have not been
able to determine the answer to by reading docs. I am
looking to supplement my program with a
very-high-level language to aid development in a
certain region. Ideally, the language would be able to
satisfy the following characteristics

1) Extend java classes (note that these classes will
be leaves in my inheritence tree; java does not need
to be able to extend my jython classes)

2) Run in interpretted mode, reading from a text file
(that is, without compilation)

3) Have the same class compile 'dynamically' down to
java bytecode (note that this can take several
seconds, it must merely be possible)

4) Reload compiled classes if they are redefined

How much of this is possible with Jython as it
currently stands? How much of this is possible within
the Jython framework, in an ideal world (that is, if I
was to look at implementing it myself)? Are there
other languages I should be looking at?

I thank you in advance,

Adam Berger

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[Jython-users] Self Describing Scripts in Jython

[Neil B. <nei...@ca...>]

Hello,

	I tried using the inspect module provided with Python in Jython but it
didn't work (I guess cos it uses the C code in the Python engine?).  I'm
trying to get self describing scripts (in terms of their functions and
arguments) using Jython language to return these.

	I probably could look at the byte code generated with Jython from my Java
app. but this seems messy and would break cross scripting language
compatibility (i.e. other languages don't produce java bytecode! e.g.
VBScript).
	So, the question is - does anyone know of a Jython module which has the
same functionality (well - only the give me methods and arguments functions)
using Jython.  (I thought of using Java reflection inside Jython which may
be OK but I'd need more info on what makes up the java byte code from Jython
scripts - could be scary!!).

	Does anyone have any ideas or suggestions - any/all help greatly
appreciated.

Cheers,

Neil Benn
Automation Informatics Scientist
Cambridge Antibody Technology

[Jython-users] [bug report] liftoff installer failed using Sun JRE 1.1

[Brian Z. <bri...@ya...>]

With the error message:

try path C:\Download\
exception in called method net.sourceforge.liftoff.installer.Install2.main
java.lang.NullPointerException
        at java.util.Hashtable.put(Compiled Code)
        at net.sourceforge.liftoff.installer.Info.setProperty(Compiled Code)
        at
net.sourceforge.liftoff.installer.Info.loadInstallerProps(Info.java:3
17)
        at net.sourceforge.liftoff.installer.Install2.<init>(Compiled Code)
        at
net.sourceforge.liftoff.installer.Install2.main(Install2.java:130)
        at jython-21a1.main(Install.java:376)
java.lang.reflect.InvocationTargetException

I was testing using Sun JRE 1.1.8_005 and JRE 1.1.7B.

I also verified that the installer works ok with MS JView 5.00.3802 (I
believe equivalent to JRE 1.1.4) and Sun JRE 1.3.0_02.

Re: [Jython-users] "bad" jars

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

[me]

>If you don't need this scanning, you can manually tell jython which java
>packages you have:
> 
>  sys.add_package("my.javapackage.core")
>  sys.add_package("my.javapackage.util")

[D-Man]

>I assume this will work after the sys-package-manager says "ignoring
>corrupt jar file"?  Before I was getting "No module 'my' found" (using
>your package name above).

Yes. You can also get rid of the "skipping bad jar" warning by setting
the "python.verbose" property to "error" on the command line:

   jython -Dpython.verbose=error main.py

or in the registry file.

regards,
finn

Re: [Jython-users] "bad" jars

[D-Man <ds...@ri...>]

On Fri, Apr 13, 2001 at 10:06:57PM +0000, Finn Bock wrote:
| [D-Man]
| 
| Just to clear up possible confusion: Jython doesn't load anything from
| jars on CLASSPATH. Instead it uses the java mechanism for loading
| classes and resources from such jars. Jython only scans the jars to
| detect java packages (and support import *).

Ok.  I was refering to the "sys-package-manager" messages that appear
on startup.

| If you don't need this scanning, you can manually tell jython which java
| packages you have:
| 
|   sys.add_package("my.javapackage.core")
|   sys.add_package("my.javapackage.util")

I assume this will work after the sys-package-manager says "ignoring
corrupt jar file"?  Before I was getting "No module 'my' found" (using
your package name above).

| >Is there a way to turn off jython's processing and caching of the
| >jar's information so I can use this modified (err, hacked <wink>) jar?
| >If not, I can write some Java code to run through some tests.
| 
| Have you checked if the JVM will load classes from such a corrupt jar? I
| wouldn't be too surprised if some JVMs will ignore a corrupt jar.

I suppose some might.  I've been using it with JDK 1.1.8 on a Windows
box.  I also tested it a while ago on a Solaris 8 system.  I haven't
heard any complaints yet about it totally hosing the system with other
VMs.  Officially we only support JDK 1.1.8 because a third-party
library we use only officially supports JDK 1.1.8.  We do know that
the product works with JDK 1.2.2 because several customers have
reported using it.

| I can't think of a way to achieve your goal without resorting to a file.

Ok, thanks for the help.
-D

Re: [Jython-users] "bad" jars

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

[D-Man]

>I want to use jython to interactively test some Java work I did.
>Unfortunately for this situation, jython caches all jar information
>and skips any jar that is corrupt.  My Java work consists of storing
>some information (license key) in a jar in the CLASSPATH.  Of course,
>doing this (in the only way I could come up with) causes that
>particular file to be "corrupt" because it no longer matches the CRC
>checksum or the compression algorithm.  This is acceptable because
>this file is never loaded by the JVM, but read directly by my code.
>
>When I want to test it with Jython, jython doesn't load the jar
>because it is "bad".  As a result I don't get any of the classes that
>are defined in the jar.

Just to clear up possible confusion: Jython doesn't load anything from
jars on CLASSPATH. Instead it uses the java mechanism for loading
classes and resources from such jars. Jython only scans the jars to
detect java packages (and support import *).

If you don't need this scanning, you can manually tell jython which java
packages you have:

  sys.add_package("my.javapackage.core")
  sys.add_package("my.javapackage.util")

>Is there a way to turn off jython's processing and caching of the
>jar's information so I can use this modified (err, hacked <wink>) jar?
>If not, I can write some Java code to run through some tests.

Have you checked if the JVM will load classes from such a corrupt jar? I
wouldn't be too surprised if some JVMs will ignore a corrupt jar.

I can't think of a way to achieve your goal without resorting to a file.


regards,
finn