jython-users — Discussion of and questions about using Jython

Re: [Jython-users] Q: Package Manager in jpython/jython

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

Sorry for answering only now

> 
> I am running multiple processes using jython2.0 in NFS. These processes may
> have different python paths but use the same cache dir and access the same
> files there. Is there any danger these processes will clobber each other and
> produce unpredictable results, i.e. using a wrong package? What exactly
> would a Package Manager do in this case? Thanks.
> 
> Jesse Liu
> 
I would say, that it is better to use separate cache dir if your process access new jars sometime,
there is no concurrency control for cache accesses, OTOH if the set of accessed jar is someone fixed
then the cache (once setup) is used just in read-only mode and there should be no problem.

regards, Samuele Pedroni.

Re: [Jython-users] import of python (.py) but not from a file

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

My bad, 
> > 
> > There are three ways I can think of...
> > 
> > 1) subclass PackageManager 
> Note: This is also used for java pkgs/classes imports
                ^meant: ONLY

> 
> > 2) write your own import function
> > 3) (related to 2) query the database and then exec the string in the 
> > appropriate namespace
> 

Re: [Jython-users] import of python (.py) but not from a file

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

Hi.

> 
> 
> There are three ways I can think of...
> 
> 1) subclass PackageManager 
Note: This is also used for java pkgs/classes imports

> 2) write your own import function
> 3) (related to 2) query the database and then exec the string in the 
> appropriate namespace

regards, Samuele Pedroni

[Jython-users] Best way to invoke jython from C++ process

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

Hi.

In our project we have to invoke jython scripts from a C++ process.
This jython scripts are for unti test and then the C++ process has to verify the
result of the jython scripts.
So, the problem seems to be how making communication between C++ process and jvm
process (jython).
The only way to be done seems to test the result of the jvm process as unix
process; in other words, the script jython should terminate with the exit system
call equals to zero or one (exit(1) or exit (0) ) and the C++ process tests it.
Anyone knows any other possible solutions ?
Is it possible to invoke in some way a jython script from a python script and
testing back the result ?
I think there is no other solution than the first one depicted above, otherwise
.. any helps is appreciate.

Thank you in advance.

Paolo.

Re: [Jython-users] jythonc 2.1a3 bug

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

[Peter Brinkmann]

>I installed jython-2.1a3 in order to get the bug fix for the os package.
>The package os works fine now, but I've discovered a new problem, this
>time related to jythonc 2.1a3.
>
>[...]		1  ././pbj/jpy/GUIFactory.java:731: Superclass pbj.jpy.pbj.jpy.GUIFactory.QDialog of nested class pbj.jpy.GUIFactory. TDialog not found.
>			public static class TDialog extends pbj.jpy.pbj.jpy.GUIFactory.QDialog implements org.python.core.PyProxy, org.python.core.ClassDictInit {
>												^
>		Note: 4 files use or override a deprecated API.  Recompile with "-deprecation" for details.
>		1 error, 1 warning
>
>		ERROR DURING JAVA COMPILATION... EXITING
>
>The problem is the line 'TDialog extends pbj.jpy.pbj.jpy.GUIFactory.QDialog'.
>I haven't tried to reproduce the problem with a small amount of code.

Please try to make an example. And add a bug report about it.

>For the time being I've fixed it by simply reverting to jython-2.0.

Thats ok. The alpha and betas are mainly meant for testing.

regards,
finn

Re: [Jython-users] ProxyMaker not found?

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

[Peter Brinkmann]

>Here's the reason why I'm interested in the kind of code I posted.
>I would like to create a number of classes that share the same
>factory (after Gang of Four: "Design Patterns") for creating certain
>objects. Ordinarily, one would pass a factory as a parameter when
>constructing an object. In this case, however, I would like to
>_derive_ a class from another class that's provided by the factory,
>so passing the factory as a parameter won't work.
>
>The solution I have in mind works like this: Create an initially
>empty module, call it init. The module that determines the concrete
>factory imports init and assigns the factory to this module as
>a module-global variable, say init.factory.

At runtime?

>Then the modules that
>use this factory import init and work with init.factory (or derive
>classes from init.factory.someClass).

Remember that init.factory.someClass must be bound to one java class at
compile time to make static subclassing work.

>I'm not sure whether this is the best possible solution to the problem,
>but it is fairly simple and it works. The only drawback I see right now
>is that it requires compiler classes in jar files.

If init.factory.someClass can change between different runs, then you
need the compiler classes.

>> OTOH the example you showed isn't more complicated than jythonc should
>> be able to detect that init.cl is java class. Please add bug report
>> about it.
>
>I agree that it would be unreasonable to expect jythonc to track the class
>of any given variable. I do, however, think that a little more tracking
>would be helpful. I've managed to further condense my examples in order
>to illustrate the point.
>
>The following example works, even when compiled and packaged without
>compiler classes.
>---------------------- example1.py ---------------------------
>import java
>
>cl=java.lang.Object
>
>class spam(cl):
>	pass
>--------------------------------------------------------------

It also assumes that cl isn't changed later on. Normally the assumtion
holds.

>The next example does _not_ work without compiler classes.
>---------------------- example2.py --------------------------
>import java
>import init	# any module, can be empty
>
>init.cl=java.lang.Object
>
>class spam(init.cl):
>	pass
>--------------------------------------------------------------

>
>It appears that jythonc does not track classes across module boundaries,
>even though this kind of tracking shouldn't be too difficult in this case.

It is beginning to look like some other module could make changes to
init.cl, say bind it java.util.Date. If we improved the tracking, such a
rebinding would have no effect. The java.lang.Object would always be
used as superclass to spam.

>I think this behavior might qualify as a bug; after all, the two programs
>listed above are pretty much the same, so it seems reasonable to expect
>them to behave in the same way. Any thoughts?

I don't mind calling it a bug. Please add a bugreport with the all the
examples you have shown.

Just be sure that you know and understand the static nature of a jythonc
compiled program.

regards,
finn

[Jython-users] jythonc 2.1a3 bug

[Peter B. <bri...@ma...>]

Hi!

I installed jython-2.1a3 in order to get the bug fix for the os package.
The package os works fine now, but I've discovered a new problem, this
time related to jythonc 2.1a3.

Here's what I get when compiling a rather large project with jythonc 2.0:

		jythonc --package pbj.jpy --jar pbjmin.jar --deep --all \
				 --addpackages pbj,gnu --workdir . pbjp/pbjapp.py

		processing pbjapp
		[...]

		Creating .java files:
		[...]
		  GUIFactory module
			TDialog extends QDialog
			QDialog extends java.awt.Dialog
			FDialog extends java.awt.FileDialog

		[...]


Here's what I get when compiling the same project with jythonc 2.1a3:

		/usr/local/jython-2.1a3/jythonc --package pbj.jpy --jar pbjmin.jar \
				 --deep --all --addpackages pbj,gnu --workdir . pbjp/pbjapp.py

		processing pbjapp
		[...]

		  GUIFactory module
			TDialog extends pbj.jpy.pbj.jpy.GUIFactory.QDialog
			QDialog extends java.awt.Dialog
			FDialog extends java.awt.FileDialog

		[...]
		Compiling .java to .class...
		[...]

		1  ././pbj/jpy/GUIFactory.java:731: Superclass pbj.jpy.pbj.jpy.GUIFactory.QDialog of nested class pbj.jpy.GUIFactory. TDialog not found.
			public static class TDialog extends pbj.jpy.pbj.jpy.GUIFactory.QDialog implements org.python.core.PyProxy, org.python.core.ClassDictInit {
												^
		Note: 4 files use or override a deprecated API.  Recompile with "-deprecation" for details.
		1 error, 1 warning

		ERROR DURING JAVA COMPILATION... EXITING


The problem is the line 'TDialog extends pbj.jpy.pbj.jpy.GUIFactory.QDialog'.
I haven't tried to reproduce the problem with a small amount of code. For
the time being I've fixed it by simply reverting to jython-2.0.
Best,
	Peter

[Jython-users] case sensitivity of object names & packages?

[Tom W. <to...@ss...>]

I've run into a situation where I want to:

from visad.data.mcidas import PointData

and there is an object named "visad.Data" which is confusing the class loader
somewhere along the line (big stack trace follows...sorry).

I cannot change the names in this library, so I'm hoping someone has a
suggestion as to how I can work around this.  I've tried some permutations, but
nothing seems to work via Jython.  I'm running Windoz and Jython 2.0.

Sorry if this has been answered before, but a bit of searching did not turn up
anything...

Thanks...
 
tom

==============
D:\src\visad\python>jy profiler.py
Traceback (innermost last):
  File "profiler.py", line 4, in ?
java.lang.NoClassDefFoundError: visad/data (wrong name: visad/Data)
        at java.lang.ClassLoader.defineClass0(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:486)
        at
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:11
1)
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:248)
        at java.net.URLClassLoader.access$100(URLClassLoader.java:56)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:297)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:286)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:253)
        at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:313)
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Class.java:120)
        at
org.python.core.SyspathJavaLoader.loadClass(SyspathJavaLoader.java:57
)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:253)
        at org.python.core.Py.findClassEx(Py.java:607)
        at
org.python.core.SysPackageManager.findClass(SysPackageManager.java:91
)
        at org.python.core.PackageManager.findClass(PackageManager.java:19)
        at
org.python.core.SysPackageManager.findClass(SysPackageManager.java:83
)
        at org.python.core.PyJavaPackage.__findattr__(PyJavaPackage.java:128)
        at org.python.core.PyObject.impAttr(PyObject.java:633)
        at org.python.core.imp.dottedFind(imp.java:412)
        at org.python.core.imp.importName(imp.java:436)
        at org.python.core.imp.importName(imp.java:509)
        at org.python.core.ImportFunction.load(__builtin__.java:967)
        at org.python.core.ImportFunction.__call__(__builtin__.java:961)
        at org.python.core.PyObject.__call__(PyObject.java:250)
        at org.python.core.__builtin__.__import__(__builtin__.java:921)
        at org.python.core.imp.importAll(imp.java:592)
        at org.python.pycode._pyx0.f$0(profiler.py)
        at org.python.pycode._pyx0.call_function(profiler.py)
        at org.python.core.PyTableCode.call(PyTableCode.java:155)
        at org.python.core.Py.runCode(Py.java:1055)
        at org.python.core.__builtin__.execfile(__builtin__.java:288)
        at org.python.core.__builtin__.execfile(__builtin__.java:292)
        at
org.python.util.PythonInterpreter.execfile(PythonInterpreter.java:155
)
        at org.python.util.jython.main(jython.java:159)

java.lang.NoClassDefFoundError: java.lang.NoClassDefFoundError: visad/data
(wron
g name: visad/Data)

====================

-- 
Tom Whittaker (to...@ss...)
University of Wisconsin-Madison
Space Science and Engineering Center
Phone/VoiceMail: 608/262-2759
Fax: 608/262-5974

Re: [Jython-users] import of python (.py) but not from a file

[Glen S. <gl...@en...>]

On Thursday 09 August 2001 15:11, David Dunkle wrote:
> I would like to be able to import a Python module but
> not from a file. For example, I may want to store Python source
> in an RDBMS and import it without the file system being involved.
>
> From Java I would do this with by writing a classloader as part of
> my application. How can I do this with Jython?
>
> I realize that I could probably subclass PackageManager and roll
> my own. Is there a better way? Has anyone already solved this
> problem?
>
> thanks,
> David


There are three ways I can think of...

1) subclass PackageManager 
2) write your own import function
3) (related to 2) query the database and then exec the string in the 
appropriate namespace





--
Glen Starchman
The Enabled Technology Group
>+++++++++[<++++++++>-]<.>++++++
[<+++++>-]<-.+++++++..+++.

Re: [Jython-users] import of python (.py) but not from a file

[dman <ds...@ri...>]

On Thu, Aug 09, 2001 at 03:11:11PM -0700, David Dunkle wrote:
| I would like to be able to import a Python module but
| not from a file. For example, I may want to store Python source
| in an RDBMS and import it without the file system being involved.
| 
| From Java I would do this with by writing a classloader as part of
| my application. How can I do this with Jython? 
| 
| I realize that I could probably subclass PackageManager and roll
| my own. Is there a better way? Has anyone already solved this 
| problem?

Define a function that will implement the import operation.  


-----------------------------
Python 2.1 (#1, Apr 17 2001, 09:45:01)
[GCC 2.95.3-2 (cygwin special)] on cygwin_nt-4.01
Type "copyright", "credits" or "license" for more information.
>>> import __builtin__
>>> print __builtin__.__import__.__doc__
__import__(name, globals, locals, fromlist) -> module

Import a module.  The globals are only used to determine the context;
they are not modified.  The locals are currently unused.  The fromlist
should be a list of names to emulate ``from name import ...'', or an
empty list to emulate ``import name''.
When importing a module from a package, note that __import__('A.B',
...)
returns package A when fromlist is empty, but its submodule B when
fromlist is not empty.
>>>
-----------------------------


Suppose I wanted to add printing out the package/module name to the
import :

# get access to the builtin stuff
import __builtin__

# save a reference to the original implementation
orig_import = __builtin__.__import__

# define how I want to import 
def my_cust_import( name , globals , locals , fromlist ) :
    print "Importing '%s' now" % name
    return orig_import( name , globals , locals , fromlist )

# make python use my import instead
__builtin__.__import__ = my_cust_import


HTH,
-D

Re: [Jython-users] ProxyMaker not found?

[Peter B. <bri...@ma...>]

Finn:
> Jythonc attempt to track the flow of name bindings of classes at
> compilation time. Usually this tracking doesn't have to perfect to be
> usefull in real life and so far I haven't been a need like yours.

Here's the reason why I'm interested in the kind of code I posted.
I would like to create a number of classes that share the same
factory (after Gang of Four: "Design Patterns") for creating certain
objects. Ordinarily, one would pass a factory as a parameter when
constructing an object. In this case, however, I would like to
_derive_ a class from another class that's provided by the factory,
so passing the factory as a parameter won't work.

The solution I have in mind works like this: Create an initially
empty module, call it init. The module that determines the concrete
factory imports init and assigns the factory to this module as
a module-global variable, say init.factory. Then the modules that
use this factory import init and work with init.factory (or derive
classes from init.factory.someClass).

I'm not sure whether this is the best possible solution to the problem,
but it is fairly simple and it works. The only drawback I see right now
is that it requires compiler classes in jar files.


> OTOH the example you showed isn't more complicated than jythonc should
> be able to detect that init.cl is java class. Please add bug report
> about it.

I agree that it would be unreasonable to expect jythonc to track the class
of any given variable. I do, however, think that a little more tracking
would be helpful. I've managed to further condense my examples in order
to illustrate the point.

The following example works, even when compiled and packaged without
compiler classes.
---------------------- example1.py ---------------------------
import java

cl=java.lang.Object

class spam(cl):
	pass
--------------------------------------------------------------

The next example does _not_ work without compiler classes.
---------------------- example2.py --------------------------
import java
import init	# any module, can be empty

init.cl=java.lang.Object

class spam(init.cl):
	pass
--------------------------------------------------------------

It appears that jythonc does not track classes across module boundaries,
even though this kind of tracking shouldn't be too difficult in this case.
I think this behavior might qualify as a bug; after all, the two programs
listed above are pretty much the same, so it seems reasonable to expect
them to behave in the same way. Any thoughts?
Best,
	Peter

[Jython-users] import of python (.py) but not from a file

[David D. <dav...@ep...>]

I would like to be able to import a Python module but
not from a file. For example, I may want to store Python source
in an RDBMS and import it without the file system being involved.

From Java I would do this with by writing a classloader as part of
my application. How can I do this with Jython? 

I realize that I could probably subclass PackageManager and roll
my own. Is there a better way? Has anyone already solved this 
problem?

thanks,
David

RE: [Jython-users] problem with Xerces equals

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

If you are using the Xerces API this is easy to do in Jython.

Assuming you are using a DOMParser try this:
##I'm reading my xml from a file and using a CharArrayReader
>>> charArryRdr = CharArrayReader(charArry)
>>> from org.xml.sax import *
>>> inSource = InputSource(charArryRdr)
>>> parser
org.apache.xerces.parsers.DOMParser@43e3fb
>>> parser.parse(inSource)
>>> doc = parser.getDocument()
>>> doc
[#document: null]
>>> root = doc.getDocumentElement()
>>> root
[Portfolio_Builder: null]
>>> nodeLst = root.getElementsByTagName('Portfolio_Breakdown')
>>> nodeLst
org.apache.xerces.dom.DeepNodeListImpl@79e328
>>> nodeLst.getLength()
1
>>> node = nodeLst.item(0)
>>> node
[Portfolio_Breakdown: null]
>>> children = node.getChildNodes()
>>> children.getLength()
5
>>>
Once you get to the depth you want you can use getNextSibling() to give you
the next element at the same node level.

Hope this helps.
Mick

-----Original Message-----
From: Richard Clark
To: jyt...@li...
Sent: 8/9/01 12:18 PM
Subject: [Jython-users] problem with Xerces equals


I'm using the Xerces DOM parser. 
I'm trying to execute some code that only gets the first level of
children
from a tree:

parent
  |
  +---->child1
  |      |
  |      +----->child3 
  |
  +---->child2

I only want to get child1 and child2.

so what I do is:

for node in parent.childNodes:
	if node.parentNode == parent:
		#do stuff

in jython the '==' comparison always fails.  Under Python the same code
works alright.

Any ideas?

Thanks,
Rich

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Re: [Jython-users] Embedding question!

[Robert W. B. <rb...@di...>]

Hello Siva,

On Thu, 9 Aug 2001, Siva Subramanian Somu wrote:
> Hi,
> 	I know a zillion questions would have been asked about embedding jython in
> java,
> but I need to know how to do this. The problem is as follows
>
> I have a java application which will create some number of jython
> interpreters and each one
> of the created interpreters will be executing a same script over and over
> again. So I don't
> want the interpreter to waste time parsing the script again and again. So I
> want to know
> is there someway for me to avoid parsing. Is there someway I could save the
> parsed code
> in binary form in memory and get Jython to use that? Any help regarding this
> question
> would be greatly appreciated.
>
> thanks,
> Siva

Option 1- write it so that you can run the script once and only apply a
callable object each subsequent need.  Here's Pseudo-code:

interp.execfile("myscriptfile");
for (int i=0; i < 1000; i++) {
    interp.exec("function_in_myscriptfile()");
}

This execs the file once, and subsequently only invokes a callable object
defined in the script. Care with module global vars is required.

Option 2- compile the script once and use the compiled bytecode for each
subsequent interp.exec().  To do this, use the built-in compile function
shown in the following pseudocode:

//this would really be file contents instead of a PyString
PyString mycode = new PyString("print 'Hello World'");
PyCode code = __builtin__.compile(mycode, "<>", "exec");
for (int i=0; i<1000; i++) {
    interp.exec(code);
}

Executing the code object is lower overhead than the string.


Let me know if larger examples would be helpful.


Cheers,
Robert

Re: [Jython-users] Trouble with 'os' package

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

[Fred Sells]

>I'm having similar problem with importing my own package.
>
>see thread on jythonc debug help
>
>no solution yet.

Do you have a stacktrace? I though the problem was related the empty
dir(ezjava). If it isn't related, I need more info and perhaps an
example that fails.

regards,
finn

Re: [Jython-users] Trouble with 'os' package

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

[Peter Brinkmann]

>I've got some jython code that works fine when run with jython but
>breaks down when compiled and run with java. Here's the message I'm
>seeing.
>
>> Java Traceback:
>> [...]
>> Traceback (innermost last):
>>   File "/home/brinkman/prog/java/train/pbjp/pbjgraph.py", line 0, in main
>>   File "/home/brinkman/prog/java/gumbie/MenuMaker.py", line 0, in main
>> java.lang.ExceptionInInitializerError: java.lang.NullPointerException

It is a bug in the os module when sys.prefix is null. As a workaround
you can manually assign a dummy value to sys.prefix before importing
"os".

import sys
sys.prefix="."
import os

The bug is fixed in jython-2.1a3.

regards,
finn

Re: [Jython-users] ProxyMaker not found?

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

[Peter Brinkmann]

>	Thanks for your quick reply! You're right, --all does solve the
>problem I mentioned. I'm not totally happy with this solution, though,
>because I believe that the code I posted should work without the compiler
>classes and that the insistence on the presence of ProxyMaker is a bug
>(feature?) of jython.

Jythonc attempt to track the flow of name bindings of classes at
compilation time. Usually this tracking doesn't have to perfect to be
usefull in real life and so far I haven't been a need like yours.

Clearly there is an limit on how effective the tracking can be. If
init.py contain branching around the binding to cl, there is no way
jythonc can complete the tracking and detect that init.cl is a java
class.

OTOH the example you showed isn't more complicated than jythonc should
be able to detect that init.cl is java class. Please add bug report
about it.

regards,
finn

[Jython-users] Embedding question!

[Siva S. S. <ss...@lu...>]

Hi,
	I know a zillion questions would have been asked about embedding jython in
java,
but I need to know how to do this. The problem is as follows

I have a java application which will create some number of jython
interpreters and each one
of the created interpreters will be executing a same script over and over
again. So I don't
want the interpreter to waste time parsing the script again and again. So I
want to know
is there someway for me to avoid parsing. Is there someway I could save the
parsed code
in binary form in memory and get Jython to use that? Any help regarding this
question
would be greatly appreciated.

thanks,
Siva

[Jython-users] problem with Xerces equals

[Richard C. <RC...@in...>]

I'm using the Xerces DOM parser. 
I'm trying to execute some code that only gets the first level of children
from a tree:

parent
  |
  +---->child1
  |      |
  |      +----->child3 
  |
  +---->child2

I only want to get child1 and child2.

so what I do is:

for node in parent.childNodes:
	if node.parentNode == parent:
		#do stuff

in jython the '==' comparison always fails.  Under Python the same code
works alright.

Any ideas?

Thanks,
Rich

Re: [Jython-users] ProxyMaker not found?

[Peter B. <bri...@ma...>]

Hello Robert,
	Thanks for your quick reply! You're right, --all does solve the
problem I mentioned. I'm not totally happy with this solution, though,
because I believe that the code I posted should work without the compiler
classes and that the insistence on the presence of ProxyMaker is a bug
(feature?) of jython. In particular, when compiled with --all, the
resulting jar file can't be used for applets under netscape or mozilla
because of security issues.
Thanks again,
	Peter


> I've got another problem with some code that works fine when interpreted
> with jython but breaks down when compiled with jythonc.
> 
> I've narrowed the problem down to the following situation. We need two
> modules, say init.py and main.py.
> 
> ----------------------------------------------------------------------
> init.py:
> 
> import java
> 
> cl=java.lang.Object
> 
> ----------------------------------------------------------------------
> main.py
> 
> import init
>  
> class eggs(init.cl):
>         pass
> 
> print eggs()
> 
> ----------------------------------------------------------------------
>         
> The idea is to derive a class from another class that's determined in
> a different module. [...]
> 

Re: [Jython-users] ProxyMaker not found?

[Robert W. B. <rb...@di...>]

Hello Peter,

On Wed, 8 Aug 2001, Peter Brinkmann wrote:
> Hi!
> I've got another problem with some code that works fine when interpreted
> with jython but breaks down when compiled with jythonc.
<snip>
>
> However, when I compile it with
>
> 	jythonc --core --jar test.jar main.py
<snip>
> > java.lang.NoClassDefFoundError: java.lang.NoClassDefFoundError: org/python/compiler/ProxyMaker

Use --all to get the compiler and parser packages.  --core is everything
but these two.

    try:  jythonc --all --jar test.jar main.py

Re: [Jython-users] com.python.compiler.JavaMaker -NoClassDefFoundError

[Robert W. B. <rb...@di...>]

Hi Brian,

On Wed, 8 Aug 2001, Brian Parker wrote:
> I'm compiling to class files like this:
> jythonc --core --deep --jar my.jar *.py
>
> If I look in the jar, sure enough, the whole compiler "package" is not
> there?  Any idea what I might be doing wrong? (The code runs fine
> through "jython".)

you need --all to get the compiler and parser. Try:

jythonc --all --jar my.jar *.py

(--all implies --deep).

-Robert

[Jython-users] Jython/Python Question

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

I checked out the FAQ and the Jython vs. CPython docs and wasn't able to
find an answer to the following.  I have this code:
def test():
    print noname

try:
    print "line 5"
    print "line 6"
    test()
    print "line 8"
    print "line 9"
except ValueError:
    print "shouldn't happen."

When I run it under python I get the following stack trace:
line 5
line 6
Traceback (innermost last):
  File "test.py", line 7, in ?
    test()
  File "test.py", line 2, in test
    print noname
NameError: noname

Under Jython I get:
line 5
line 6
Traceback (innermost last):
  File "test.py", line 10, in ?
  File "test.py", line 2, in test
NameError: noname

I lose some granularity in Jython.  If I were to call the extracted method
(test in this case) several times within the try block I can't tell on
which line the failing call resulted from.  It always reports from the
except line.  Why is this?  Is it the expected behavior?

cheers
chuck

[Jython-users] com.python.compiler.JavaMaker -NoClassDefFoundError

[Brian P. <bp...@wi...>]

I'm compiling to class files like this:
jythonc --core --deep --jar my.jar *.py

If I look in the jar, sure enough, the whole compiler "package" is not
there?  Any idea what I might be doing wrong? (The code runs fine
through "jython".)

Java Traceback:

        at org.python.core.Py.JavaError(Py.java)
        at org.python.core.PyTableCode.call(PyTableCode.java)
        at org.python.core.PyCode.call(PyCode.java)
        at org.python.core.imp.createFromCode(imp.java)
        at org.python.core.Py.runMain(Py.java)
        at gco.main(gco.java:673)
Traceback (innermost last):
  File "C:\snapshots\btp_tools_rmdev\tools\iSource\src\gco.py", line 0,
in main
java.lang.NoClassDefFoundError: org/python/compiler/JavaMaker
        at org.python.core.MakeProxies.makeProxy(MakeProxies.java)
        at org.python.core.PyClass.init(PyClass.java)
        at org.python.core.PyClass.<init>(PyClass.java)
        at org.python.core.Py.makeClass(Py.java)
        at org.python.core.Py.makeClass(Py.java)
        at gco$_PyInner.main$8(gco.java:555)
        at gco$_PyInner.call_function(gco.java:236)
        at org.python.core.PyTableCode.call(PyTableCode.java)
        at org.python.core.PyCode.call(PyCode.java)
        at org.python.core.imp.createFromCode(imp.java)
        at org.python.core.Py.runMain(Py.java)
        at gco.main(gco.java:673)

java.lang.NoClassDefFoundError: java.lang.NoClassDefFoundError:
org/python/compiler/JavaMaker


Thanks!

[Jython-users] ProxyMaker not found?

[Peter B. <bri...@ma...>]

Hi!
I've got another problem with some code that works fine when interpreted
with jython but breaks down when compiled with jythonc.

I've narrowed the problem down to the following situation. We need two
modules, say init.py and main.py.

----------------------------------------------------------------------
init.py:

import java

cl=java.lang.Object

----------------------------------------------------------------------
main.py

import init

class eggs(init.cl):
	pass

print eggs()

----------------------------------------------------------------------

The idea is to derive a class from another class that's determined in
a different module. The jython run gives the desired result:

	[brinkman@c1176023-a test]$ jython main.py
	<__main__.eggs instance at -1244487580>

However, when I compile it with

	jythonc --core --jar test.jar main.py

and run it with

	java -jar test.jar


I get the following stack trace:

> Java Traceback:
> 
> 	at org.python.core.Py.JavaError(Py.java, Compiled Code)
> 	at org.python.core.PyTableCode.call(PyTableCode.java, Compiled Code)
> 	at org.python.core.imp.createFromCode(imp.java, Compiled Code)
> 	at org.python.core.Py.runMain(Py.java, Compiled Code)
> 	at main.main(main.java, Compiled Code)
> Traceback (innermost last):
>   File "/home/brinkman/prog/java/gumbie/test/main.py", line 0, in main
> java.lang.NoClassDefFoundError: org/python/compiler/ProxyMaker
> 	at org.python.core.PyClass.init(PyClass.java, Compiled Code)
> 	at org.python.core.Py.makeClass(Py.java, Compiled Code)
> 	at org.python.core.Py.makeClass(Py.java, Compiled Code)
> 	at main$_PyInner.main$2(main.java, Compiled Code)
> 	at main$_PyInner.call_function(main.java, Compiled Code)
> 	at org.python.core.PyTableCode.call(PyTableCode.java, Compiled Code)
> 	at org.python.core.imp.createFromCode(imp.java, Compiled Code)
> 	at org.python.core.Py.runMain(Py.java, Compiled Code)
> 	at main.main(main.java, Compiled Code)
> 
> java.lang.NoClassDefFoundError: java.lang.NoClassDefFoundError: org/python/compiler/ProxyMaker
> 

It appears that the problem only occurs when init.cl is a java class, such
as java.lang.Object or java.awt.Frame or so. Python classes seem to work
fine, both interpreted and compiled.
I would appreciate any ideas regarding this problem.
Thanks,
	Peter