jython-users — Discussion of and questions about using Jython

Re: [Jython-users] Multiple constructor signatures

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

[John Goerzen ]

>...
>
>I have a case in Java where a constructor can take either a
>BigDecimal, an int, or a String as an argument.  I need to clone this
>constructor in Python.  In this case, it seems I do need multiple
>@sigs, right?  I suppose if it weren't for the int option, I could
>just say java.lang.Object, but that's kinda ugly anyway.

Could you show a runnable example of what you are trying to do?

regards,
finn

Re: [Jython-users] Multiple return types

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

On Fri, 07 Sep 2001 16:21:16 +0200, you wrote:

>Hi there!
>
>I'm facing a problem: I have a class (XMLDocument) which extends and
>implements javax.swing.text.Document. I have another class (XMLElement)
>which extends org.jdom.Element and implements javax.swing.text.Element.
>
>Well, in the XMLElement class I've got a getDocument() method that
>returns in one case a javax.swing.text.Document and in the other case a
>javax.swing.text.Document. Basically returning an XMLDocument should do
>the trick as it can be casted to both types.
>
>The problem is that jython uses intermediary Java code which chokes on
>this problem. Does anybody see any solution ?

No.

Maybe you can find a design which does not require that XMLElement is
both a text and a jdom Element. Perhaps the __tojava__ method is usefull
as it allow any python object to be coerced into any other java object
when passed as an argument to a java method.

regards,
finn

Re: [Jython-users] Linux Install bug

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

[Sells, Fred]

>running as root worked;
>from javax.swing import * worked as root, failed as my user.
>
>I did a "chmod a+x *.jar" to the files in the jdk1.3.1/lib path and it
>worked.  I had previously done the same to jre/lib and that was not the
>answer.

Do you remember what the access rights was before you changes them? Just
curious as to why java could run but jython couldn't the jars. Maybe we
could improve the error message or at least add a faq entry.

regards,
finn

Re: [Jython-users] jast.Block in jythonc?

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

[Tim]

>Hi
>
>I've been experiencing Jython 2.0 - jythonc failing on Win NT without giving
>any indication that all is not well. 
>
>c:>jythonc xyz.py
>
>eventually executes Compiler.compile(..), in which the line:
>
>	code=jast.Block(pi.executeString(data))
>
>causes the program to exit.
>
>I note in Tools\jythonc, jast is a directory ...

It is more than just a directory, it is also a package. A Package is a
directory with a __init__.py file in it. When importing the package, the
__init__.py file is executed. The jast/__init__.py file contains the
line: 

  from Statement import *

and the Statement.py file do contain a Block class. So this is not the
reason why jythonc is failing.

You didn't tell which jvm you are using, but I bet it is MS jview. A bug
somewhere (I put the blame on microsoft) prevent jview from running
jythonc.

I suggest that you install and use a JVM from javasoft instead. If you
are trying to create browser applets you should use a JDK1.1, otherwise
pick the JDK1.3.

regards,
finn

[Jython-users] jast.Block in jythonc?

[Tim C. <ti...@2w...>]

Hi

I've been experiencing Jython 2.0 - jythonc failing on Win NT without giving
any indication that all is not well. 

c:>jythonc xyz.py

eventually executes Compiler.compile(..), in which the line:

	code=jast.Block(pi.executeString(data))

causes the program to exit.

I note in Tools\jythonc, jast is a directory which contains the directories
Statement, Output and Modifier; there isn't one called Block, which
according to this code I would have expected. As a result the program just
exits (without warning). Anyone else have this directory?

Thanks

Tim

RE: [Jython-users] Linux Install bug

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

running as root worked;
from javax.swing import * worked as root, failed as my user.

I did a "chmod a+x *.jar" to the files in the jdk1.3.1/lib path and it
worked.  I had previously done the same to jre/lib and that was not the
answer.

thanks for all your help,  I new it was easy I just missed the obvious.

-----Original Message-----
From: John Goerzen [mailto:jgo...@co...]
Sent: Friday, September 07, 2001 3:17 PM
To: Sells, Fred
Cc: 'jyt...@li...'
Subject: Re: [Jython-users] Linux Install bug


"Sells, Fred" <fr...@ad...> writes:

> It runs ok and sees modules like sys; however I get the following error:
> -------------------------------------------------
>>>>import java


I think that the problem is that you have to import a specific module,
ie:

import java.lang
import com.sun.some.outlandishly.long.name.with.studlyCaps

-- 
John Goerzen <jgo...@co...>    GPG: 0x8A1D9A1F    www.complete.org

Re: [Jython-users] Linux Install bug

[John G. <jgo...@co...>]

"Sells, Fred" <fr...@ad...> writes:

> It runs ok and sees modules like sys; however I get the following error:
> -------------------------------------------------
>>>>import java


I think that the problem is that you have to import a specific module,
ie:

import java.lang
import com.sun.some.outlandishly.long.name.with.studlyCaps

-- 
John Goerzen <jgo...@co...>    GPG: 0x8A1D9A1F    www.complete.org

Re: [Jython-users] Install programtically?

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

Carlos Quiroz wrote:
> 
> On Friday 07 September 2001 09:02, Finn Bock wrote:
> > [Carlos Quiroz]
> 
> Hi
> 
> Now everything is almost working but....
> 
> The installer has several System.exit(o) calls, that kill my embedded
> application :-(

Well, one thing you can do is install a security manager that will ignore the System.exit() calls (see below).  You can get lots fancier, and check the context of the call, etc., but this should prevent the exit from occurring.  Unfortunately, it will throw a SecurityException in the thread that calls System.exit().  This is reasonable (you don't want the installer thread processing any code after it tried to call exit, do you?), but it means the code that calls the installer will have to handle the exception, and that if something between your code and the call to System.exit() hides the exception, you don't know what will happen.

I know some servlet containers, etc., make System.exit() a no-op, but I'm not sure how they manage that, and not sure you'd like that anyway:

	if beSafe:
		System.exit(1)
	doSomethingDangerous()

:-)

kb

---
from java.security import *
from java.lang import *

class SM( SecurityManager ):
    def __init__( self, delegate ):
        self.allowExit = 0
        self.delegate = delegate
    def checkExit( self, status ):
        if self.allowExit:
            SecurityManager.checkExit( self, status )
        else:
            raise SecurityException( "Not allowed to exit at this time" )

    def checkPermission( self, perm, context=None ):
        if self.delegate: #allow anything if we don't have a delegate
            if context:
                self.delegate.checkPermission( self, perm )
            else:
                self.delegate.checkPermission( self, perm, context )            

sec = System.getSecurityManager()
sm = SM( sec )
System.setSecurityManager( sm )
try:
    System.exit(0)
except:
    print "not allowed to exit"
print "Did not exit"

System.setSecurityManager( sec ) # replace original security manager, or could just set allowExit
print "Trying to exit again"
System.exit(0)
print "You won't see this"

---

[Jython-users] Linux Install bug

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

I'm installing jython21a3 on Linux.

It runs ok and sees modules like sys; however I get the following error:
-------------------------------------------------
>>>import java

Traceback (innermost last):
  File "<console>", line 1, in ?
ImportError: no module named java
>>> ------------------------------------------------

sys.path = ['', '.', '/usr/local/jython/Lib']
$CLASSPATH=/usr/java/jdk1.3.1/jre/lib/rt.jar

Can I get a clue here??????

tx

[Jython-users] jpythonc help

[<drt...@ya...>]

A little help would be appreciated. :-)

Using the demo example, I get

c>jythonc TempConverter.py
processing TempConverter
c>

and produces no more output, nor creates any files
(using, for example, the --bean option). 

I'm on NT, have javac from Sun on the system, (which
works on the command line, and is referenced in the
registry file); Jython will runs normally. What do I
need to set/check? The program isn't actually failing,
just terminating!?!

I can't find any references in teh FAQ and usegroup.
Any insight you can provide would be greatly
appreciated.

Thanks

Tim


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[Jython-users] Multiple return types

[Sebastien P. <Seb...@is...>]

Hi there!

I'm facing a problem: I have a class (XMLDocument) which extends and
implements javax.swing.text.Document. I have another class (XMLElement)
which extends org.jdom.Element and implements javax.swing.text.Element.

Well, in the XMLElement class I've got a getDocument() method that
returns in one case a javax.swing.text.Document and in the other case a
javax.swing.text.Document. Basically returning an XMLDocument should do
the trick as it can be casted to both types.

The problem is that jython uses intermediary Java code which chokes on
this problem. Does anybody see any solution ?

Cheers,
  -- Sebastien.

Re: [Jython-users] Install programtically?

[Carlos Q. <car...@rt...>]

On Friday 07 September 2001 09:02, Finn Bock wrote:
> [Carlos Quiroz]

Hi

Now everything is almost working but....

The installer has several System.exit(o) calls, that kill my embedded 
application :-(

Any ideas?

Re: [Jython-users] Simple

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

On Fri, Sep 07, 2001 at 12:10:48PM +0100, Tim Couper wrote:
 
| This kinda makes sense for unix. What does this mean
| in Windows (I can't have a file or directory
| containing a dot)?

Actually, you can create a dotfile on windows, just not with certain
MS tools.  (For example, save the file from notepad or gvim or use
cygwin's bash shell)

-D

[Jython-users] Fwd: Simple (so simple I did it myself)

[<drt...@ya...>]

Sorry to trouble you all; "READ THE FAQ!!" is the
response I would expect (I had read it already but
missed it - duh!)

Tim


 --- Tim Couper <drt...@ya...> wrote: >
Date: Fri, 7 Sep 2001 12:10:48 +0100 (BST)
> From: Tim Couper <drt...@ya...>
> Reply-to: ti...@2w...
> Subject: Simple 
> To: jyt...@li...
> 
> Hi I'm new to Jython, experienced in Python, and am
> pioneering the latter's introduction to a large
> multinational with a large dregree of success. I now
> want to start on the Java guys ....
> 
> Which leads me to the installation problem I have,
> the
> answer to which is I suspect trivial to a Jython
> expert. I'm using WinNT, and can run all the applet
> demos, etc in a browser on my machine. However, in
> trying to create a bean, or run Jython
> interactively,
> the response to 
> 
> >>>import java
> 
> leads to the response 
> 
> ImportError: no module named java.
> 
> Right, I say, lets put it on the equivalent of the
> pythonpath. Ah the docs helpfully say we need a
> Jython
> Registry .. in a file called "user.home"+'"/.jython"
> 
> This kinda makes sense for unix. What does this mean
> in Windows (I can't have a file or directory
> containing a dot)?
> 
> Secondly, given that I can get jython to read a
> registry file, what am I asking it to look for?
> java.py? java.jar?
> 
> Any help you can provide would be most beneficial
> all
> round
> 
> Thanks
> 
> Tim 
> 
>
____________________________________________________________
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> Get your free @yahoo.co.uk address at
> http://mail.yahoo.co.uk
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> http://mail.yahoo.ie
>  

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[Jython-users] Simple

[<drt...@ya...>]

Hi I'm new to Jython, experienced in Python, and am
pioneering the latter's introduction to a large
multinational with a large dregree of success. I now
want to start on the Java guys ....

Which leads me to the installation problem I have, the
answer to which is I suspect trivial to a Jython
expert. I'm using WinNT, and can run all the applet
demos, etc in a browser on my machine. However, in
trying to create a bean, or run Jython interactively,
the response to 

>>>import java

leads to the response 

ImportError: no module named java.

Right, I say, lets put it on the equivalent of the
pythonpath. Ah the docs helpfully say we need a Jython
Registry .. in a file called "user.home"+'"/.jython"

This kinda makes sense for unix. What does this mean
in Windows (I can't have a file or directory
containing a dot)?

Secondly, given that I can get jython to read a
registry file, what am I asking it to look for?
java.py? java.jar?

Any help you can provide would be most beneficial all
round

Thanks

Tim 

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Re: [Jython-users] Install programtically?

[Carlos Q. <car...@rt...>]

On Friday 07 September 2001 09:02, Finn Bock wrote:

> Due to an unfortunate name of the class. I simply didn't consider this
> situation when I picked that name.
>
> >How can I proceed?
>
> First you have to understand that jython-21a3.class is both a class file
> and a .jar file and for this purpose you have to see it only as a jar
> file.
>
> You start by adding jython-21a3.class to your CLASSPATH or through your
> own class loader.

I noticed that you could also change the extension to .jar and it will work 
just fine. Maybe it would be easier for everybody to use it as a jar and have 
a MANIFEST file there

> > http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/liftoff/liftoff/src/instal
> >ler/net/sourceforge/liftoff/installer/Install2.java?rev=HEAD&content-type=
> >text/vnd.viewcvs-markup

It would be very nice to have a repository from where you could download the 
latest jython or Lib files and install them locally. Just an idea

Regards

Re: [Jython-users] Install programtically?

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

[Carlos Quiroz]

>Hi folks
>
>I'd like to add the option to install jython in my jEdit plug in, which 
>embeds jython into the editor. Although I can easily add jython.jar I would 
>like to also includes the Lib dir. On the other hand users that already have 
>jython may want no to install it by default, so an optional action is 
>required. I'd like to be able to start the installer from inside the Java 
>Program
>
>Is that possible?
>I've tried to do this
>
>jython-21a3.main(args)
>
>But this is not possible to compile.

Due to an unfortunate name of the class. I simply didn't consider this
situation when I picked that name.

>How can I proceed?

First you have to understand that jython-21a3.class is both a class file
and a .jar file and for this purpose you have to see it only as a jar
file.

You start by adding jython-21a3.class to your CLASSPATH or through your
own class loader.

 classpath=d:\java\jdk1.4\jre\lib\rt.jar;jython-21a3.class

The you can start the installer with:

    public static void main(String[] args) {
        new net.sourceforge.liftoff.installer.Install2(args);
    }

I'll refer you to the liftoff sources for the details of programmaticly
choosing a destination dir and which bundles to install:

> http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/liftoff/liftoff/src/installer/net/sourceforge/liftoff/installer/Install2.java?rev=HEAD&content-type=text/vnd.viewcvs-markup

regards,
finn

[Jython-users] Install programtically?

[Carlos Q. <car...@we...>]

Hi folks

I'd like to add the option to install jython in my jEdit plug in, which 
embeds jython into the editor. Although I can easily add jython.jar I would 
like to also includes the Lib dir. On the other hand users that already have 
jython may want no to install it by default, so an optional action is 
required. I'd like to be able to start the installer from inside the Java 
Program

Is that possible?
I've tried to do this

jython-21a3.main(args)

But this is not possible to compile. How can I proceed?

Regards

Re: [Jython-users] beginner question

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

Hi Frank,

On Thu, 6 Sep 2001, Frank Immich wrote:
> Thanks...it's working now.
> But I still have some questions.
> I run jythonc hw.py ... the result is stored in jpywork. O.K.?

Correct, but you can change that with jythonc's -w

> to start hw.class I need all the other files:hw$_PyInner.class,
> hw$HelloWorld.class, hw.class...Right ?

Correct.

> command: ..\jpywork>java -cp ".;..\jython.jar" hw
> So I can not run a hw.py-->hw.class via jythonc file without the jython.jar
> and all the other stuff ??

The files in jython.jar (and other stuff) are required. They don't have to
be in jython.jar however. see below.

> Is there a way to run hw.class on a "empty"
> machine ?

Assuming 'emtpy' means no Jython, but yes Java...
Yes. jythonc's --deep, --core, --all and --jar options let you stuff all
required classes in a jar file, so deployment requires sending just one
jar.  see http://www.jython.org/docs/jythonc.html.

> BTW is there a (reliable) list of py modules which work with jython ?

Not really a formal list unless you consider those that are included with
the Jython distribution.  The guideline has been that if it comes with
Jython, someone has tried it; If it doesn't, try it and maybe post your
findings here (assuming that doesn't rely on C extensions).

-rb

> At 07:29 PM 9/5/2001 +0000, Finn Bock wrote:
> >[Frank Immich]
> >
> >>Hello,
> >>Pretty new to Jython, and already faced with a problem.
> >>Anyway, looking over the demo programs that  come with, and I can't get
> the
> >>example helloworld, or any other,
> >>to work.  The output trace is attached.
> >>All I found in the archive was a hint, that the classpath has to be set,
> but
> >>it seems to be O.K.
> >>Any suggestions welcomed...
> >>
> >>...
> >>1  java.io.IOException: CreateProcess:
> >>C:\Programme\JavaSoft\JRE\1.3.1\bin\javac -classpath ....
> >
> >It looks like jython was installed with the JRE and there is no javac
> >compiler in the JRE. You must re-install jython and make sure that you
> >are starting the java command from the full JDK.
>
>
> If you look in the directory from the error above, you'll find
> there's no javac.exe there!  On my system, javac is found in
> c:\jdk1.3.1\bin.
>
>
> Perhaps you can get away with editing the jython.bat script
> to point to the jdk... but probably the cleanest approach is as
> Finn says, reinstall, giving the full path to java IN the jdk
> directory as you run the installer, else it will pick up either
> the one in the jre tree, or worse, the MS native java...
>
>
>
> Mats
>
>

Re: [Jython-users] beginner question

[Frank I. <fra...@gm...>]

Thanks...it's working now. 
But I still have some questions.
I run jythonc hw.py ... the result is stored in jpywork. O.K.? 
to start hw.class I need all the other files:hw$_PyInner.class,
hw$HelloWorld.class, hw.class...Right ?
command: ..\jpywork>java -cp ".;..\jython.jar" hw
So I can not run a hw.py-->hw.class via jythonc file without the jython.jar
and all the other stuff ?? Is there a way to run hw.class on a "empty"
machine ? 
BTW is there a (reliable) list of py modules which work with jython ? 
Thanks again...and sorry for my ignorance
Ciao Frank





At 07:29 PM 9/5/2001 +0000, Finn Bock wrote:
>[Frank Immich]
>
>>Hello,
>>Pretty new to Jython, and already faced with a problem.
>>Anyway, looking over the demo programs that  come with, and I can't get
the
>>example helloworld, or any other,
>>to work.  The output trace is attached.
>>All I found in the archive was a hint, that the classpath has to be set,
but
>>it seems to be O.K.
>>Any suggestions welcomed...
>>
>>...
>>1  java.io.IOException: CreateProcess:
>>C:\Programme\JavaSoft\JRE\1.3.1\bin\javac -classpath ....
>
>It looks like jython was installed with the JRE and there is no javac
>compiler in the JRE. You must re-install jython and make sure that you
>are starting the java command from the full JDK.


If you look in the directory from the error above, you'll find
there's no javac.exe there!  On my system, javac is found in
c:\jdk1.3.1\bin.


Perhaps you can get away with editing the jython.bat script
to point to the jdk... but probably the cleanest approach is as
Finn says, reinstall, giving the full path to java IN the jdk
directory as you run the installer, else it will pick up either
the one in the jre tree, or worse, the MS native java...



Mats

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Re: [Jython-users] beginner question

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

At 07:29 PM 9/5/2001 +0000, Finn Bock wrote:
 >[Frank Immich]
 >
 >>Hello,
 >>Pretty new to Jython, and already faced with a problem.
 >>Anyway, looking over the demo programs that  come with, and I can't get the
 >>example helloworld, or any other,
 >>to work.  The output trace is attached.
 >>All I found in the archive was a hint, that the classpath has to be set, but
 >>it seems to be O.K.
 >>Any suggestions welcomed...
 >>
 >>...
 >>1  java.io.IOException: CreateProcess:
 >>C:\Programme\JavaSoft\JRE\1.3.1\bin\javac -classpath ....
 >
 >It looks like jython was installed with the JRE and there is no javac
 >compiler in the JRE. You must re-install jython and make sure that you
 >are starting the java command from the full JDK.

If you look in the directory from the error above, you'll find
there's no javac.exe there!  On my system, javac is found in
c:\jdk1.3.1\bin.

Perhaps you can get away with editing the jython.bat script
to point to the jdk... but probably the cleanest approach is as
Finn says, reinstall, giving the full path to java IN the jdk
directory as you run the installer, else it will pick up either
the one in the jre tree, or worse, the MS native java...


Mats

re: [jython-users] is urllib compatible with jython?

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

[Scott Hathaway]
> >Thanks for the tip.  That got rid of the codecs message.  Now, I get
> > a java security error.  Things work ok from jython, but when in an
> > applet, I get the error.

[finn]
> An applet can only connect to the site it was downloaded from.


Another bugger is that an applet normally can't read/write to to the host
machine. So, urllib.retrieve() == a security exception because it
writes a file.  This means you need the java plugin, keytool,
jarsigner, and policytool to get this to work.

-robert

Re: [Jython-users] is urllib compatible with jython?

[Scott H. <sl...@ho...>]

Cool.  In my testing, I am using two different servers, but during
deployment, it will be the same server.

Thanks for the help.

Scott

----- Original Message -----
From: "Finn Bock" <bc...@wo...>
To: <jyt...@li...>
Sent: Wednesday, September 05, 2001 2:35 PM
Subject: Re: [Jython-users] is urllib compatible with jython?


> [Scott Hathaway]
>
> >Thanks for the tip.  That got rid of the codecs message.  Now, I get a
java
> >security error.  Things work ok from jython, but when in an applet, I get
> >the error.
>
> An applet can only connect to the site it was downloaded from.
>
> regards,
> finn
>
> _______________________________________________
> Jython-users mailing list
> Jyt...@li...
> https://lists.sourceforge.net/lists/listinfo/jython-users

Re: [Jython-users] Static methods?

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

>bc...@wo... (Finn Bock) writes:
>
>> I suppose it depends on the viewpoint. I have never seen jythonc as a
>> java code generator. To me, it is a jython compiler and its main purpose
>> is to analyze and freeze a collection of jython code so that there is no
>> need for dynamic creation of bytecode.

[John Goerzen]

>I don't see it as a Java code generator, but it *is* quite useful to
>be able to call Python methods from Java and to make Python methods
>appear to be Java methods.  (Why else would there be @sig support?)

I blame Jim Hugunin for that weird feature <wink>.

Ofcourse I will not remove the feature, but I don't think that I will
expand on it either. Patches are always welcome, but be warning that
jythonc is a unstable minefield ready to explode even at the slightest
modification.

regards,
finn

Re: [Jython-users] jython, recursion and XML

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

[Ted Berg]

>I'm trying to build a simple XML editor targetted at a specific use.  I am 
>displaying the xml node names as elements in a JTree and have implemented a 
>TreeModel to accomplish this.
>
>The nodes in the tree model extract relevant info from a JDOM Element object 
>passed to their fromXML method after creation.  This method populates the 
>callee node's child list and calls each child's fromXML method.
>
>From the print out generated by the fromXML method, it appears that 
>everything is working, but when the process is complete another print shows 
>that something has gone dramatically wrong.
>
>print generated during population:
>
> [Element: <nodehandler/>]
>  [Element: <group_atts/>]
>  [Element: <nodehandler/>]
>   [Element: <file/>]
>  [Element: <nodehandler/>]
>   [Element: <file/>]
>  [Element: <nodehandler/>]
>   [Element: <file/>]
>
>print of tree root element's 'children' list after population of the 
>TreeModel:
>
>[group_atts, file, nodehandler, file, nodehandler, file, nodehandler]
>
>Relevant code snippet from InstallSetTreeModel:
>
>  def fromXML( self, node, space='' ):
>    print space,node
>    self.name = node.name
>    for n in node.children:
>      f = InstallSetTreeModel( self )
>      f.fromXML( n, space+' ')
>      self.children.append( f )
>
>Obviously *something* isn't right. 

It seems right to me. Did you expect it to write

>[nodehandler, group_atts, nodehandler, file, nodehandler, file, nodehandler, file]

instead? Then try to add nodes to the the list at the position where you
have your print statement.

>The code is part of a project that will allow java/jython applications to 
>download updates from a website.  The whole shebang will be publicly 
>available when i'm done too, if that's any sort of carrot. :)
>
>I can post the whole file if it would help, I just wanted to avoid spamming 
>the list right off.

Posting an url to the source is the way to go.

regards,
finn