jython-users — Discussion of and questions about using Jython

[Jython-users] RE: Issue with None and Serialization

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

Chuck,

Why can't you assume cPickle is available?  It's standard in the Jython
dist as a Java-implemented module.  I have modified your example a bit
to use it and it seems to behave properly.  Add the following two
methods:

--- code ---

import cPickle

def load_with_pickle(path):
	fp = open(path, "rb")
	try:
		data = cPickle.load(fp)
	finally:
		fp.close()
	return data

def save_with_pickle(obj, path):
	fp = open(path, "wb")
	try:
		cPickle.dump(obj, fp)
	finally:
		fp.close()

 ... 

print "Testing initial object..."
a = Test()
a.test()
save_with_pickle(a, "test.out")
b = load_with_pickle("test.out")
print "Testing deserialized object..."
b.test()

--- results ---

$ jython cc.py
Testing initial object...
attr is None: 1
attr type is: org.python.core.PyNone
attr == None: 1
Testing deserialized object...
attr is None: 1
attr type is: org.python.core.PyNone
attr == None: 1

Nonetheless, I see the same problem you do with the code snippet.

brian

> -----Original Message-----
> From: ch...@er... [mailto:ch...@er...] On 
> Behalf Of chuck clark
> Sent: Tuesday, March 12, 2002 7:32 PM
> To: jyt...@li...
> Cc: bu...@cu...
> Subject: Issue with None and Serialization
> 
> 
> I'm using Jython for my project and today we tried adding the
> functionality where you can save out a Config object and then when you
> restart you can load a Config if you need it.  I'm using the java.io
> libraries to do this because I can't assume pickle or any of the other
> python libraries are on the machine.
> 
> However I ran into an issue where after reading the 
> serialized object in
> some statements which checked to see if an attribute on the object is
> None were failing.  I've recreated the problem in the code 
> snippet below
> as succinctly as I can.  Does anyone have any ideas on what I'm doing
> wrong?  I have a feeling it must be something really simple or could
> this be a bug in Jython?
> 
> TIA
> chuck
> 
> -------code-------
> from java.io import *
> from org.python.util import *
> 
> class Test(Serializable):
>     def __init__(self):
>         self.attr = None
>     def test(self):
>         print "attr is None:", self.attr is None
>         print "attr type is:", type(self.attr)
>         print "attr == None:", self.attr == None
> 
> def load(path):
>     file = File(path)
>     fileIn = FileInputStream(file)
>     pyIn = PythonObjectInputStream(fileIn)
>     pyObj = pyIn.readObject()
>     pyIn.close()
>     return pyObj
> 
> def save(obj, path):
>     fileOut = FileOutputStream(path)
>     objOut = ObjectOutputStream(fileOut)
>     objOut.writeObject(obj)
>     objOut.flush()
>     objOut.close()
> 
> print "Testing initial object..."
> a = Test()
> a.test()
> save(a, "test.out")
> b = load("test.out")
> print "Testing deserialized object..."
> b.test()
> 
> -----results----
> Testing initial object...
> attr is None: 1
> attr type is: org.python.core.PyNone
> attr == None: 1
> Testing deserialized object...
> attr is None: 0
> attr type is: org.python.core.PyNone
> attr == None: 0
> 
> I would expect that if the attribute is of Type PyNone then it should
> return 1 to
> attr is None
> and
> attr == None
> 
> I thought the problem might be that between 
> serializing/deserializing I
> might somehow be getting a different instance of PyNone but this isn't
> the case as evidenced below when I inspect the objects in the
> interpreter after running th code above
> >>> type(a.attr)
> <jclass org.python.core.PyNone at 334527779>
> >>> type(b.attr)
> <jclass org.python.core.PyNone at 334527779>
> 

[Jython-users] Issue with None and Serialization

[chuck c. <cc...@zi...>]

I'm using Jython for my project and today we tried adding the
functionality where you can save out a Config object and then when you
restart you can load a Config if you need it.  I'm using the java.io
libraries to do this because I can't assume pickle or any of the other
python libraries are on the machine.

However I ran into an issue where after reading the serialized object in
some statements which checked to see if an attribute on the object is
None were failing.  I've recreated the problem in the code snippet below
as succinctly as I can.  Does anyone have any ideas on what I'm doing
wrong?  I have a feeling it must be something really simple or could
this be a bug in Jython?

TIA
chuck

-------code-------
from java.io import *
from org.python.util import *

class Test(Serializable):
    def __init__(self):
        self.attr = None
    def test(self):
        print "attr is None:", self.attr is None
        print "attr type is:", type(self.attr)
        print "attr == None:", self.attr == None

def load(path):
    file = File(path)
    fileIn = FileInputStream(file)
    pyIn = PythonObjectInputStream(fileIn)
    pyObj = pyIn.readObject()
    pyIn.close()
    return pyObj

def save(obj, path):
    fileOut = FileOutputStream(path)
    objOut = ObjectOutputStream(fileOut)
    objOut.writeObject(obj)
    objOut.flush()
    objOut.close()

print "Testing initial object..."
a = Test()
a.test()
save(a, "test.out")
b = load("test.out")
print "Testing deserialized object..."
b.test()

-----results----
Testing initial object...
attr is None: 1
attr type is: org.python.core.PyNone
attr == None: 1
Testing deserialized object...
attr is None: 0
attr type is: org.python.core.PyNone
attr == None: 0

I would expect that if the attribute is of Type PyNone then it should
return 1 to
attr is None
and
attr == None

I thought the problem might be that between serializing/deserializing I
might somehow be getting a different instance of PyNone but this isn't
the case as evidenced below when I inspect the objects in the
interpreter after running th code above
>>> type(a.attr)
<jclass org.python.core.PyNone at 334527779>
>>> type(b.attr)
<jclass org.python.core.PyNone at 334527779>

[Jython-users] can't import *

[Edward P. <epo...@te...>]

Hello,

I just ported some python to java for various reasons. I have a package
hierarchy like
A
  B
    c.class, d.class

if I:
from A.B import *
there is nothing in the global namespace. However if I:
from A.B import c,d
then all c, d are in the globals()

What am I leaving out?
I tried:
Setting the python_path= root of A
Setting the class path to root of A
Adding __all__=[c,d] etc to the __init__.py folders (do I even need them,
there are only .java and .class files in the hierarchy.

Thanks
-Ed

Re: [Jython-users] string.replace( java.lang.String )

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

From: Oti <oh...@ya...>
> Hello,
> 
> I just stumbled over the following behaviour of string.replace().
> Is it true I cannot pass a java.lang.String as first argument:
> 
> [appl|pwe] > jython
> Jython 2.1 on java1.3.0 (JIT: null)
> Type "copyright", "credits" or "license" for more information.
> >>> import string
> >>> from java.lang import String
> >>> old = String( "old" )
> >>> string.replace( old, "l", "d" )
> Traceback (innermost last):
>   File "<console>", line 1, in ?
>   File "e:\jython21\Lib\string.py", line 409, in replace
> TypeError: replace(): expected 2 args; got 3
> >>> string.replace( old.intern(), "l", "d" )
> 'odd'
> 
> 

Yes, the odd behavior is expected.

You should consider that string.py is coded
assuming Python string input, and simply
using the Python string object methods.

so string.replace(s,old,new,maxsplit)

simply calls s.replace(old,new,maxsplit)

now perchance Java strings have a replace method
which takes only 2 arguments.

The other thing to consider 
is that Java constructors
called from Jython do not convert the result, its 
Java instance nature is preserved.
OTOH normal Java methods have their
results always converted following the usual
rules (eg. java.lang.String -> string):

>>> from java.lang import String
>>> s=String("java")
>>> s.__class__
<jclass java.lang.String at 8070355>
>>> type(s)
<jclass org.python.core.PyJavaInstance at 6040101>
>>> s2=s.toString()
>>> type(s) == type('')
0
>>> type(s2) == type('')
1

The following also fails:
>>> s+'__'
Traceback (innermost last):
  File "<console>", line 1, in ?
TypeError: __add__ nor __radd__ defined for these operands

I don't know if we should change all this.

regards.






 

[Jython-users] string.replace( java.lang.String )

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

Hello,

I just stumbled over the following behaviour of string.replace().
Is it true I cannot pass a java.lang.String as first argument:

[appl|pwe] > jython
Jython 2.1 on java1.3.0 (JIT: null)
Type "copyright", "credits" or "license" for more information.
>>> import string
>>> from java.lang import String
>>> old = String( "old" )
>>> string.replace( old, "l", "d" )
Traceback (innermost last):
  File "<console>", line 1, in ?
  File "e:\jython21\Lib\string.py", line 409, in replace
TypeError: replace(): expected 2 args; got 3
>>> string.replace( old.intern(), "l", "d" )
'odd'


Best wishes, and thanks,
Oti.


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[Jython-users] Re: Swing examples

[Gerald G. <gu...@fn...>]

Hi,
   This is a few years old, but it shows how to do some swing examples. 
    http://home.fnal.gov/~gug/docs/jpython.ps

Fermipython:
------------
FermiPython is a collection of scripts, modules and documents useful for
demonstrating the use of python and jpython. The aim is to
help provide information and demonstrate techniques to help a new user
of these scripted languages get started programming. As of
version 2_0, Fermipython now includes examples of how to use XML in
JPython applications. 

The product can be downloaded from:  
 ftp://ftp.fnal.gov/pub/fermipython/v2_0

and is released under the Fermi Software Tools Program:
 http://www.fnal.gov/fermitools/



> Message: 6
> Date: Sat, 09 Mar 2002 13:45:32 -0500
> To: R Datta <rd...@cr...>,jyt...@li...
> From: Noel Rappin <no...@ya...>
> Subject: Re: [Jython-users] Swing examples
> 
> At 12:08 AM 3/9/02, you wrote:
> 
> >I am looking for some Jython/ Swing sample code to code an utility. Any
> >links/ suggestions ?
> 
> Here's another shameless plug...  If you can wait a couple of weeks,
> _Jython Essentials_ has a full chapter with a number of Jython/Swing
> examples, and a lot of material on using Java Libraries in general.
> 
> Hope this helps.
> 
> Thanks,
> 
> Noel
> 
> _________________________________________________________
> Do You Yahoo!?
> Get your free @yahoo.com address at http://mail.yahoo.com
> 

-- 
-Jerry->
gu...@fn...
Pepe's Theory of everything: "Under the right circumstances, things
happen."

Re: [Jython-users] Swing examples

[BillWorker 2. <bil...@in...>]

From: Ype Kingma <yk...@xs...>
Subject: Re: [Jython-users] Swing examples


> Ahish,
>
> >This is more of what I learnt while working with Jython and Swings!
> >
> >First, if you want to use Swings and its MVC architecture, you have to
> >remember Swing is designed to work it Java objects. For example, when
> >working with JList, I wanted to implement my own ListModel so I extended
the
> >AbstractListModel and went about writing my implementations of
> >getElementAt() and getSize(). It took me one whole day of fooling around
to
> >realize that the object returned by getElementAt() should be an instance
> >java.lang.Object.
>
> I suppose the compiler did not allow you to override the return value
> of getElementAt() to a java basic type like int or char?
> In case you override in jython code, jython will try and convert the
returned
> python object to an appropriate java object, which works surprisingly
> well.
What do you mean by override jython code? Sure, an easy way to convert
python object to java object is to inherit from java.lang.Object. or other
similar class. This is what I wanted to mention. Since, I started out with
Java and when we don't mention explicitly the base class it is automatically
made java.lang.Object. This is one thing we forget while working in Jython,
so I just wanted to have this thing mentioned in FAQ. It took me a day to
realise that Python objects do not inherit from java.lang.Object unless
explicitly mentioned. This would be a nice reminder to any Java programmers!
Of course, the other option is to make sure the whatever we return from
getElementAt() is wrapped by a Java object.

> >If you remember this and have the looks at the bean section of the docs,
> >then any Swing books is good.
> >
> >Somehow, you just don't remember that. The examples all use strings and
that
> >is automatically handled.
> >
> >Guess someone should add that section to the FAQ!
>
> I'm afraid I don't understand your problem well enough.
>
> >Oh, about the shameless plug for Jython Essentials, guess I will wait
till
> >it becomes available in my part of the world (Kathmandu, Nepal). If it
ever
> >comes :-( Since, I don't have International credit cards I can't do
online
> >shopping and I don't think I would really like to go through all the
hassel
> >at banks, getting permissions for making dollar payments .... In short,
> >visits to multiple organisations!
>
> You only need the Swing API docs, the Swing examples from Sun,
> and a few jython examples on using Swing to get going. All of
> this is downloadable, no paper needed.

Yup, I don't think I would by a Jython book to learn Swings. That I have all
the docs I need. I would by Jython book to see how Python works with Java!
Or rather how to write more Pythonlike (Pythonic??) code!

> Have fun,
That's exactly what I am doing!

> Ype
>
> P.S. You replied in private, which is ok to me, but it might not
> have been your intention. (My mail program does not by default
> reply to the list, but to the original sender, so I always have
> to cut and past the list address to return to the list.)
>
I just realised neither does mine!

[Jython-users] ³ëÆ®ºÏ/È­¸é100ÀÎÄ¡/·¹ÀÌÁ®<±Þ¸Å> È«,º¸ ¿ë

[ÃÖÁøÈñ <le...@ch...>]

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 </x:ExcelWorkbook>
</xml><![endif]-->
</head>
<body link=blue vlink=purple>
<table border =0 cellpadding=0 cellspacing=0 width=648 style="TABLE-LAYOUT:
 fixed; WIDTH: 486pt; BORDER-COLLAPSE: collapse" x:str>
  <COLGROUP>
 <col width=568 style="WIDTH: 426pt; mso-width-source: userset; mso-width-alt: 16156" 
 >
 <col width=80 style="WIDTH: 60pt">
 <tr class=xl26 height=34 style="HEIGHT: 25.5pt">
  <td height=34 class=xl25 colspan=2 width=648 style="WIDTH:
  486pt; HEIGHT: 25.5pt; mso-ignore: colspan" 
   >화면<font class=font6> </font><font class=font8>100인치</font><font
  class=font7>/</font><font class=font8>200인치</font><font class=font6> </font><font
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  <td height=30 class=xl28 style="HEIGHT: 22.5pt">노트북 <font class=font10>및 </font><font
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  <td class=xl29>　</td>
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 <tr class=xl27 height=18 style="HEIGHT: 13.5pt">
  <td height=18 colspan=2 class=xl27 style="HEIGHT: 13.5pt; mso-ignore: colspan">　</td>
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 <tr class=xl30 height=30 style="HEIGHT: 22.5pt">
  <td height=30 class=xl30 style="HEIGHT: 22.5pt">자세한 사항은 <font class=font11>아래</font><font
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 <tr class=xl32 height=34 style="HEIGHT: 25.5pt">
  <td height=34 class=xl31 style="HEIGHT: 25.5pt"><a
  
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 </tr>
 <tr class=xl24 height=27 style="HEIGHT: 20.25pt">
  <td height=27 class=xl24 style="HEIGHT: 20.25pt">본 메일은 1회성 메일이며 두번다시 발송되지
  않습니다.</td>
  <td class=xl24></td>
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 <tr height=36 style="HEIGHT: 27pt; mso-xlrowspan: 2">
  <td height=36 colspan=2 style="HEIGHT: 27pt; mso-ignore: colspan">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<center><a href='http://210.205.204.201:9080/refuse/refuse?cmd=view&group=33&name=&mail=jyt...@li...'><img src='http://210.205.204.201:9080/refuse/mail-refuse.gif' border=0)></center>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td>
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  <td height=18 style="HEIGHT: 13.5pt">  </td>
  <td></td>
 </tr><![if supportMisalignedColumns]>
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  <td width=568 style='width:426pt'></td>
  <td width=80 style='width:60pt'></td>
 </tr>
 <![endif]>
</table>
</body>
</html>

Re: [Jython-users] Object[][] params

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

From: rpcee <rp...@op...>
> As a point of interest, if I'd used the thread context class loader
(findClass
> method?) would that have been better?

In general no, but YMMV.
Btw findClass is protected and does not deal with the creation
of array classes, probably findLoadedClass does but that is private.

You could have used loadClass (which uses the previous two)
of the right classloader, or better
Class.forName with the optional  classloader parm that can deal
with a  null classloader (meaning the bootstrap one) (the method is only Java
>= 1.2).

In general as long as possible avoiding to deal with classloaders
is the easier choice. Otherwise I would use Class.getClassLoader
everytime is possible and then Class.forName with the opt
classloader parm.

regards.

RE: [Jython-users] Object[][] params

[rpcee <rp...@op...>]

>We should maybe add an optional parameter to array:
>
>such that  array(...,class,n) is a n+1 dimensional class array .

OK, but would it not be more intuitive to specify the actual dimension with a 
default value of 1?
As a point of interest, if I'd used the thread context class loader (findClass 
method?) would that have been better?

cheers, Rich

Re: [Jython-users] Object[][] params

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

> many thanks. I also solved it with 
> java.lang.Class.forName("[Ljava.lang.Object;")
> but i prefer your version.
> 

The getClass technique has also the
advantage to work even in the case
the class classloader is not one of the usual
suspects <wink>.
forName approach then would become
more trickier.

We should maybe add an optional parameter to array:

such that  array(...,class,n) is a n+1 dimensional class array .

So in you case you would write:

array(...,java.lang.Object,1)

regards.

Re: [Jython-users] Incompatibility of Python in the JVM

[Noel R. <no...@ya...>]

At 11:31 AM 3/9/02, Joshua Fox wrote:
>Thanks,
>
>I see that Jython does in fact allow mult. inh., but not for inheritance 
>from java.
>
>I am wondering if there are any points where the JVM limits the full 
>flexible use of Python -- perhaps there are none. Microsoft claims that 
>the .NET Common Language Runtime is designed to be cross-language 
>compatible, but Jython seems to be good evidence that the JVM has that 
>kind of flexibility.

A few places, but not many.  Although it depends on your definition of JVM 
being the limiting factor -- the fact that the JVM can't run CPython module 
written in C removes a lot of useful libraries.  There is some 
functionality of file objects, and the sys, and os modules in particular 
that is just not offered by the JVM.

There are other CPython/Jython differences, of course, but those are the 
main ones stemming from limitations of the JVM itself, rather than 
differing design decisions.

Hope this helps,

Noel


_________________________________________________________
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Get your free @yahoo.com address at http://mail.yahoo.com

Re: [Jython-users] Swing examples

[Noel R. <no...@ya...>]

At 12:08 AM 3/9/02, you wrote:


>I am looking for some Jython/ Swing sample code to code an utility. Any 
>links/ suggestions ?

Here's another shameless plug...  If you can wait a couple of weeks, 
_Jython Essentials_ has a full chapter with a number of Jython/Swing 
examples, and a lot of material on using Java Libraries in general.

Hope this helps.

Thanks,

Noel


_________________________________________________________
Do You Yahoo!?
Get your free @yahoo.com address at http://mail.yahoo.com

Re: [Jython-users] Incompatibility of Python in the JVM

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

Thanks,

I see that Jython does in fact allow mult. inh., but not for inheritance 
from java.

I am wondering if there are any points where the JVM limits the full 
flexible use of Python -- perhaps there are none. Microsoft claims that the 
.NET Common Language Runtime is designed to be cross-language compatible, 
but Jython seems to be good evidence that the JVM has that kind of flexibility.

At 08:01 AM 3/8/2002 -0700, you wrote:


>Joshua Fox wrote:
>
>>a ban on Python multiple inheritance
>
>
>You can use MI if you don't inherit from multiple
>Java classes.  All these uses of MI work correctly:
>
> >>> class A:
>...   def a(self): print 'a'
>...
> >>> class B:
>...   def b(self): print 'b'
>...
> >>> class C(A,B):
>...   pass
>...
> >>> c=C()
> >>> c.a()
>a
> >>> c.b()
>b
> >>> import java
> >>> class D(A,java.lang.Object):
>...   pass
>...
> >>> d=D()
> >>> d.a()
>a
> >>> d.toString()
>'org.python.proxies.__main__$D$0@23b9c1'
> >>> class E(java.lang.Object,java.io.Serializable):
>...   pass
>...
> >>> e=E()
>
>This doesn't:
>
> >>> class F(java.lang.Number,java.util.Date):
>...   pass
>...
>Traceback (innermost last):
>   File "<console>", line 1, in ?
>TypeError: no multiple inheritance for Java classes: java.util.Date and 
>java.lan
>g.Number
>

[Jython-users] ´ç½ÅÀ» À§ÇÑ ±ÍÇÑ Á¤º¸

[wings<bp...@or...>]

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<META http-equiv=Content-Type content="text/html; charset=unicode">
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Re: [Jython-users] Swing examples

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

Raj,

>I am looking for some Jython/ Swing sample code to code an utility. Any links/ suggestions ?

Have a look in the demos/swing (iirc) directory in your jython installation.
There is an example using JTree's and a python console with nicely coloured
text output.

Have fun,
Ype

-- 

[Jython-users] Swing examples

[R D. <rd...@cr...>]

I am looking for some Jython/ Swing sample code to code an utility. Any 
links/ suggestions ?

Thanks
Raj 

RE: [Jython-users] Object[][] params

[rpcee <rp...@op...>]

many thanks. I also solved it with 
java.lang.Class.forName("[Ljava.lang.Object;")
but i prefer your version.

[Jython-users] ±¤°í ¿ÀÇÂÀ̺¥Æ® Ä®¶óÇÚµåÆù¹«·á+2°¡Áö¼±¹°

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Re: [Jython-users] Incompatibility of Python in the JVM

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

Joshua Fox wrote:
> 
> I am looking for a convenient summary of ways in which Python is
> incompatible with the JVM, whether interpreting in Jython or compiling with
> jythonc.

I'm not entirely sure what you mean. Obviously, if you can run something
in Jython it isn't "incompatible with the JVM"...
 
If you mean, "How do CPython and Jython differ", see:
http://www.jython.org/docs/differences.html

> I have identified a few such from the documentation, including a ban on
> Python multiple inheritance, but where can I find a summary?

You can do Python multiple inheritance in Jython, you just can't do multiple 
inheritance of subclasses of Java classes. (For a variety
of reasons that I don't completely agree with.  :-)  /  :-(  ).  Similar behavior
exists with CPython extension classes.

kb

[Jython-users] Incompatibility of Python in the JVM

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

I am looking for a convenient summary of ways in which Python is 
incompatible with the JVM, whether interpreting in Jython or compiling with 
jythonc.

I have identified a few such from the documentation, including a ban on 
Python multiple inheritance, but where can I find a summary? 

[Jython-users] (no subject)

[BillWorker 2. <bil...@in...>]

I must confess, I love jython as it makes me at least twice as productive as
I were with Java along. This has made me wonder if writing my JavaBeans and
other middle-tier code in Jython instead of Java is a good idea when I am
developing a web application. I know it works, I was just wondering if
anyone has done it before.

My friends who know are doing JSP can build the interface and I could do the
rest with Jython. Has anyone done this before?

ashish

Re: [Jython-users] A few hundred interpreters

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

Edward,

You wrote:
>Hello,
>
>I only have a handful of interpreters in my current app, but I was looking
>at the PythonInterpreter source code, and I see that it is a lightweight
>object.
>I have an implementation that might be easier in separate interpreters,
>except that I would need a few hundred! Is this a bad idea? I am more
>curious than anything, since I will probably leave things as they are.

It will work, but you might need to be careful with sys.modules.
Almost a month ago there was some discussion on isolating PythonInterpreters
and later on import being thread safe or not.
Have a look at the archives of jython-dev. The opening message of
11 Feb 2002 had the title:
"[Jython-dev] Static usage in jython - can we have less of it?"

And on 12 Feb: "[Jython-dev] Thread safeness"

Have fun,
Ype

-- 

[Jython-users] A few hundred interpreters

[Edward P. <epo...@te...>]

Hello,

I only have a handful of interpreters in my current app, but I was looking
at the PythonInterpreter source code, and I see that it is a lightweight
object.
I have an implementation that might be easier in separate interpreters,
except that I would need a few hundred! Is this a bad idea? I am more
curious than anything, since I will probably leave things as they are.

Thanks
-Ed

Re: [Jython-users] jreload import problem

[<Mat...@i2...>]

There is a bug in jreload where it doesn't load the entire class file, 
thereby resulting in an invalid class/ClassFormatError.  I have submitted 
a patch which fixes this, and you can get it by browsing the bug database 
for jython on sourceforge - 
http://sourceforge.net/tracker/index.php?func=detail&aid=511493&group_id=12867&atid=112867

Matt





"Updike, Clark" <Cla...@jh...>
Sent by: jyt...@li...
03/07/02 10:36 AM

 
        To:     "'jyt...@li...'" 
<jyt...@li...>
        cc: 
        Subject:        [Jython-users] jreload import problem


I'm trying to load a JDBC driver programatically with jreload (without
putting it on the jvm's classpath when starting jython).  When I try to
import the driver class I get a ClassFormatError, possibly suggesting the
thing I'm actually importing isn't really a class:

>>>              import sys, jreload
>>>              from com.ziclix.python.sql import zxJDBC
>>>              ls = 
jreload.makeLoadSet('oracleLS',['pathToJar/classes12.jar'])
>>>              from oracleLS.oracle.jdbc.driver import OracleDriver
Traceback (most recent call last):
java.lang.ClassFormatError: java.lang.ClassFormatError:
oracle/jdbc/driver/OracleDriver (Illegal UTF8 string in constant pool)

But, if I do the following:

>>>              from oracleLS.oracle.jdbc import driver
>>>              dir(driver)

It shows me that the class is in the driver package:

['ArrayDataResultSet', 'ArrayLocatorResultSet', 'BaseResultSet',
   <snip>
'OracleDriver', 'OracleInputStream', 'OracleLog', 
   <snip>
'UpdatableResultSet', '__name__']

I have inspected this jar file and there truly is a OracleDriver.class in
the oracle.jdbc.driver package.

Any ideas what I'm doing wrong?

TIA,
Clark

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