jython-users — Discussion of and questions about using Jython

Re: [Jython-users] GUI for Jython

[Donatas S. <do...@no...>]

You can use any GUI available for java: awt or swing.

On Thursday 15 March 2001 11:00, Georg Umgiesser wrote:
> Hallo,
>
> I like the idea of using Jython in parallel with Python. However,
> I did not find any message in the Jython homepage on GUI's.
> What GUI's are supported? Is Tkinter supported?
>
> Thanks,
>
> 	Georg

-- 
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Phone: +370 7  32 40 32 Fax: +370 7 320670 
e-mail: do...@no...
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[Jython-users] GUI for Jython

[Georg U. <ge...@is...>]

Hallo,

I like the idea of using Jython in parallel with Python. However,
I did not find any message in the Jython homepage on GUI's.
What GUI's are supported? Is Tkinter supported?

Thanks,

	Georg

-- 

                                                             __
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----------------------------------------------------------m( 00 )m---
Georg Umgiesser         | e-mail :              ge...@is...
Oceanography, ISDGM-CNR | web    : http://www.isdgm.ve.cnr.it/~georg/
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Re: [Jython-users] exceptions and inheritance

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

[Richard Gruet]

>Hi,
>
>If I define a Java 2 exceptions classes with one being a subclass of the
>other:
>
>public class BaseException extends Exception
>{ ... }
>
>public class DerivedException extends BaseException
>{ ... }
>
>And if the DerivedException is raised in a Java program, I can catch it
>in Jython as a DerivedException but *not* as a BaseException, i.e the
>following code:
>
>try:
>    # call the java prog that raises a DerivedException
>except DerivedException, e:
>    print "Got a DerivedException :", e
>
>... will display "Got a DerivedException : ...." (which is OK)
>
>whereas the code:
>
>try:
>    # call the java prog that raises a DerivedException
>except BaseException, e:
>    print "Got a BaseException :", e
>else:
>    import sys
>     exc_type, exc_value, exc_traceback = sys.exc_info()
>     print 'uncaught exception', exc_type, exc_value, exc_traceback
>
>...will display "uncaught exception ..." instead of "Got a
>BaseException..."
>
>This looks abnormal to me!
>Am I missing something or is it a bug ? Thanks for any clue.

The code belows works for me. Could you create a small standalone
example of the problem?

regards,
finn

------------ BaseException.java ------------
public class BaseException extends Exception {  }

------------ DerivedException.java ------------
public class DerivedException extends BaseException {  }

------------ j.java ------------
public class j {
    public static void foo() throws BaseException {
         throw new BaseException();
    }

    public static void bar() throws BaseException {
         throw new DerivedException();
    }

    public static void baz() throws DerivedException {
         throw new DerivedException();
    }
}


------------ tst.py ------------
import j, BaseException, DerivedException

try:
    raise DerivedException()
except DerivedException, e:
    print "Got a DerivedException :", e


try:
    raise DerivedException()
except BaseException, e:
    print "Got a BaseException :", e
else:
    import sys
    exc_type, exc_value, exc_traceback = sys.exc_info()
    print 'uncaught exception', exc_type, exc_value, exc_traceback

try:
    j.bar()
except DerivedException, e:
    print "Got a DerivedException :", e

try:
    j.bar()
except BaseException, e:
    print "Got a BaseException :", e

try:
    j.foo()
except BaseException, e:
    print "Got a BaseException :", e
else:
    import sys
    exc_type, exc_value, exc_traceback = sys.exc_info()
    print 'uncaught exception', exc_type, exc_value, exc_traceback

try:
    j.baz()
except BaseException, e:
    print "Got a BaseException :", e

Re: [Jython-users] jythonc, --all option, no jython.jar?

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

[John Mudd]

>I tried jythonc as follows with the --all option so that I can run w/o
>the jython jar file present.  I was able to get this to work for one
>application but not this one.

It isn't the jython.jar itself, but the python.home property which is
causing the difference. In Jython-2.0 a bug exists in os.java that
demand that sys.prefix have a non-null value. When jython.jar exist in
the classpath, the python.home and sys.prefix is initialized to the
directory of the jython.jar file.

As a workaround you can assign a value to sys.prefix before importing
the "os" module. 

  import sys
  sys.prefix = "."
  import os

The bug in "os" is solved in Jython-2.1a1.

regards,
finn

[Jython-users] exceptions and inheritance

[Richard G. <rg...@in...>]

Hi,

If I define a Java 2 exceptions classes with one being a subclass of the
other:

public class BaseException extends Exception
{ ... }

public class DerivedException extends BaseException
{ ... }

And if the DerivedException is raised in a Java program, I can catch it
in Jython as a DerivedException but *not* as a BaseException, i.e the
following code:

try:
    # call the java prog that raises a DerivedException
except DerivedException, e:
    print "Got a DerivedException :", e

... will display "Got a DerivedException : ...." (which is OK)

whereas the code:

try:
    # call the java prog that raises a DerivedException
except BaseException, e:
    print "Got a BaseException :", e
else:
    import sys
     exc_type, exc_value, exc_traceback = sys.exc_info()
     print 'uncaught exception', exc_type, exc_value, exc_traceback

...will display "uncaught exception ..." instead of "Got a
BaseException..."

This looks abnormal to me!
Am I missing something or is it a bug ? Thanks for any clue.

Richard

[Jython-users] jythonc, --all option, no jython.jar?

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

I tried jythonc as follows with the --all option so that I can run w/o
the jython jar file present.  I was able to get this to work for one
application but not this one.  That's strange because the two apps are
somewhat similiar.  In both cases I did not have jython.jar in the
CLASSPATH when I started jythonc.

jythonc --all --package com.repository.disk --jar $(JAR) $(JPYTHONSRCS)



Here are the error msgs that I get if I try to run and I purposely
leave jython.jar out of the CLASSPATH.  It runs fine if I put
jython.jar in the path.  Any suggestions?


Java Traceback:

        at org.python.core.Py.JavaError(Py.java:238)
        at org.python.core.PyTableCode.call(PyTableCode.java:159)
        at org.python.core.imp.createFromCode(imp.java:157)
        at org.python.core.imp.createFromClass(imp.java:178)
        at org.python.core.imp.loadPrecompiled(imp.java:246)
        at org.python.core.imp.loadFromPath(imp.java:257)
        at org.python.core.imp.loadFromPath(imp.java:252)
        at org.python.core.imp.load(imp.java:357)
        at org.python.core.imp.load(imp.java:376)
        at org.python.core.imp.importName(imp.java:447)
        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.importFromAs(imp.java:566)
        at
com.repository.disk.objDiskSet$_PyInner.main$14(objDiskSet.java:941)
        at
com.repository.disk.objDiskSet$_PyInner.call_function(objDiskSet.java:306)
        at org.python.core.PyTableCode.call(PyTableCode.java:155)
        at org.python.core.imp.createFromCode(imp.java:157)
        at org.python.core.imp.createFromClass(imp.java:178)
        at org.python.core.imp.loadPrecompiled(imp.java:246)
        at org.python.core.imp.loadFromPath(imp.java:257)
        at org.python.core.imp.loadFromPath(imp.java:252)
        at org.python.core.imp.load(imp.java:357)
        at org.python.core.imp.load(imp.java:376)
        at org.python.core.imp.importName(imp.java:447)
        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.importFromAs(imp.java:566)
        at
com.repository.disk.diskServer$_PyInner.main$51(diskServer.java:1461)  
     at
com.repository.disk.diskServer$_PyInner.call_function(diskServer.java:418)
        at org.python.core.PyTableCode.call(PyTableCode.java:155)
        at org.python.core.imp.createFromCode(imp.java:157)
        at org.python.core.Py.runMain(Py.java:798)
        at com.repository.disk.diskServer.main(diskServer.java:2140)
Traceback (innermost last):
  File "/new1/mudd/cvs/dINT40.3/src/com/repository/disk/diskServer.py",
line 0, in main
  File "/new1/mudd/cvs/dINT40.3/src/com/repository/disk/objDiskSet.py",
line 0, in main
  File
"/new1/mudd/cvs/dINT40.3/src/com/repository/disk/diskUsageThread.py",
line 0, in main
java.lang.ExceptionInInitializerError: java.lang.NullPointerException
        at org.python.modules.os.<clinit>(os.java:11)
        at java.lang.reflect.Method.invoke(Native Method)
        at org.python.core.PyJavaClass.initialize(PyJavaClass.java:108)
        at
org.python.core.PyJavaClass.lookupGivingClass(PyJavaClass.java:666)
        at org.python.core.PyClass.lookup(PyClass.java:164)
        at
org.python.core.PyJavaClass.__findattr__(PyJavaClass.java:712)
        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.importFromAs(imp.java:566)
        at
com.repository.disk.diskUsageThread$_PyInner.main$8(diskUsageThread.java:334)
        at
com.repository.disk.diskUsageThread$_PyInner.call_function(diskUsageThread.java:96)
        at org.python.core.PyTableCode.call(PyTableCode.java:155)
        at org.python.core.imp.createFromCode(imp.java:157)
        at org.python.core.imp.createFromClass(imp.java:178)
        at org.python.core.imp.loadPrecompiled(imp.java:246)
        at org.python.core.imp.loadFromPath(imp.java:257)
        at org.python.core.imp.loadFromPath(imp.java:252)
        at org.python.core.imp.load(imp.java:357)
        at org.python.core.imp.load(imp.java:376)
        at org.python.core.imp.importName(imp.java:447)
        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.importFromAs(imp.java:566)
        at
com.repository.disk.objDiskSet$_PyInner.main$14(objDiskSet.java:941)
        at
com.repository.disk.objDiskSet$_PyInner.call_function(objDiskSet.java:306)
        at org.python.core.PyTableCode.call(PyTableCode.java:155)
        at org.python.core.imp.createFromCode(imp.java:157)
        at org.python.core.imp.createFromClass(imp.java:178)
        at org.python.core.imp.loadPrecompiled(imp.java:246)
        at org.python.core.imp.loadFromPath(imp.java:257)
        at org.python.core.imp.loadFromPath(imp.java:252)
        at org.python.core.imp.load(imp.java:357)
        at org.python.core.imp.load(imp.java:376)
        at org.python.core.imp.importName(imp.java:447)
        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.importFromAs(imp.java:566)
        at
com.repository.disk.diskServer$_PyInner.main$51(diskServer.java:1461)  
     at
com.repository.disk.diskServer$_PyInner.call_function(diskServer.java:418)
        at org.python.core.PyTableCode.call(PyTableCode.java:155)
        at org.python.core.imp.createFromCode(imp.java:157)
        at org.python.core.Py.runMain(Py.java:798)
        at com.repository.disk.diskServer.main(diskServer.java:2140)

java.lang.ExceptionInInitializerError:
java.lang.ExceptionInInitializerError



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[Jython-users] ANN: First alpha release of Jython-2.1

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

I am happy to announce the first alpha release of Jython 2.1.

Jython is a Java implementation of the Python programming
language.  It allows users to compile Python source code to
Java byte codes, and run the resulting bytecodes on any Java
Virtual Machine.  It is a very seamless and smooth
integration with Java:  from Python you have complete access
to all Java libraries, can build applets, can integrate with
Java beans, and can subclass Java classes in Python and vice
versa.  Like Python, and unlike Java, Jython can also be
used interactively:  just type some Jython code at the
prompt and see the results immediately.

A java installer is available for download at the Jython website:

    http://www.jython.org/

Installation of version 2.1a1 is similar to version 2.0. Further 
information and tips on installation is available at:

    http://www.jython.org/install.html

Jython 2.1 aims to be feature compatible with Python 2.1 and among
the new feature are:

  - Nested scopes
  - The warning framework
  - Rich comparison
  - The numeric coercion model have changed.
  - Function attributes.

The changes from Jython-2.0 include:

  New features.
   - Improve speed when indexing a string and iterating over a string
     in a for loop.
   - Reworked coercing model (pep-0208)
   - Added {}.popitem().
   - Improved speed for python files by buffering the RandomAccessFile.
   - Added function attributes (pep-0232)
   - Rich comparison (pep-0207)
   - Updated cPickle to handle CPython compatible unicode strings.
   - Updated sre to CPython-2.1a1
   - Added the "new" module
   - Added a PyServlet class to the util package.
   - Warning framework (pep-0230).
   - Added sys.add_classdir and sys.add_extdir.
   - Added nested scope to the interpreter (pep-0227).

  Bug fixes.
   - Allow self referencing adapters to be collected when using weak
     tables.
   - Added workaround for a reader bug in MRJ22Jitc.01.
   - Fixes #127340 where serializable parameter received a PyObject
     instead of the wrapped java object.
   - Include a LineNumberTable in the compiled class files.
   - Fixed a java version test bug in the installer.

A complete list of changes and differences are available here:

  http://www.jython.org/NEWS.html

Bugs can be reported to the bug manager on SourceForge:

  http://sourceforge.net/bugs/?group_id=12867

Cheers,
the jython-developers

Re: [Jython-users] compiled servlet does not run - SOLVED

[Eduardo J. F. C. <EFE...@sa...>]

Finn,=20

that was it. I just moved the Hello$_PyInner.class to the servlets dir =
where Hello.class was and it works perfectly now.

Sorry for bothering you all with such a simple thing. Is this documented =
somewhere?

Best regards and thank you very much. Now I don't have to write Java code =
:-)

--
Eduardo J. Fern=E1ndez Corrales

>>> Finn Bock <bc...@wo...> 13/03/01 21:45 >>>
>>- Compiled the servlet with jythonc. I get some deprecation warnings=20
>
>Which is ok.
>
>>but the Hello.class file gets generated.
>
>And so does the Hello$_PyInner.class file. The two classfiles belong
>together. Also, when you compile with jythonc make absolutely sure that
>the output include the text:
>
>Creating .java files:
>  Hello module
>    Hello extends javax.servlet.http.HttpServlet
>
>If you don't see that message there is a problem, usually with the
>classpath during the jythonc compilation.
>
>- Moved the .class to the servlet directory=20
>
>You have to move both the generated class files.
>
>regards,
>finn

_______________________________________________
Jython-users mailing list
Jyt...@li...=20
http://lists.sourceforge.net/lists/listinfo/jython-users

Re: [Jython-users] compiled servlet does not run

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

[Eduardo Jesus Fernandez Corrales]

>Hello everyone:
>
>I am trying to run a compiled servlet written in Jython. Here's what I =
>have done
>
>- I have installed Jython 2.0 in windows NT workstation with servicepack =
>6, using java 1.2.2
>- Wrote the servlet in file Hello.py. This is the usual simple servlet =
>that just prints hello world
>- Compiled the servlet with jythonc. I get some deprecation warnings 

Which is ok.

>but the Hello.class file gets generated.

And so does the Hello$_PyInner.class file. The two classfiles belong
together. Also, when you compile with jythonc make absolutely sure that
the output include the text:

Creating .java files:
  Hello module
    Hello extends javax.servlet.http.HttpServlet

If you don't see that message there is a problem, usually with the
classpath during the jythonc compilation.

>- Moved the .class to the servlet directory 

You have to move both the generated class files.

regards,
finn

Re: [Jython-users] Java 1.1 problems in CVS snapshop

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

[Kent Johnson]

>I found two problems building the CVS snapshot of 20010310 under Java 1.1:
>
>Module.java line 347:
>Vector.toArray() is not in Java 1.1
>
>I replaced
>     private static final String[] emptyStringAr = new String[0];
>
>     private String[] toNameAr(Vector names,boolean nullok) {
>         int sz = names.size();
>         if (sz ==0 && nullok) return null;
>         return (String[])names.toArray(emptyStringAr);
>     }
>
>with
>
>     private String[] toNameAr(Vector names,boolean nullok) {
>         int sz = names.size();
>         if (sz ==0 && nullok) return null;
>         String[] nameArray = new String[sz];
>         names.copyInto(nameArray);
>         return nameArray;
>     }
>
>
>PyServlet.java line 75 and following:
>Properties.setProperty(String, String) is not in Java 1.1, use 
>Properties.put(Object, Object) instead.
>
>I hope someone can make these changes in CVS, I don't have write access.

Thanks for the feedback. The two changes have now been committed.

regards,
finn

Re: [Jython-users] casting

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

[Benjamin Collar]

>So, say I've got a java class A, and a "subclass" B done in jython. Should
>I be able to do the following in a java program:
>
>A a = null;
>Class c (previously initialized to have an instance of B);
>
>a = (A) c.newInstance();
>
>If not, why not?

You can't create instances of jython subclasses with newInstance because
of a bug in Jython-2.0. You will eventually end up with a message like:

  module '__main__' has no attribute '__main__$B'

This bug have been fixed in the CVS and the fix will be included in the
up comming Jython-2.1.

regards,
finn

RE: [Jython-users] compiled servlet does not run

[Eduardo J. F. C. <EFE...@sa...>]

Still no success, after adding self to the doGet() method. (And now the =
deprecation warning appears again)

This is what appears in the apache error.log

Java Traceback:

	at org.python.core.Py.AttributeError(Py.java:90)
	at org.python.core.PyObject.__getattr__(PyObject.java, Compiled =
Code)
	at org.python.core.Py.initProxy(Py.java, Compiled Code)
	at Hello.<init>(Hello.java:139)
	at java.lang.Class.newInstance0(Native Method)
	at java.lang.Class.newInstance(Class.java, Compiled Code)
	at org.apache.jserv.JServServletManager.load_init(JServServletManag=
er.java)
	at org.apache.jserv.JServServletManager.loadServlet(JServServletMan=
ager.java)
	at org.apache.jserv.JServConnection.processRequest(JServConnection.=
java)
	at org.apache.jserv.JServConnection.run(JServConnection.java)
	at java.lang.Thread.run(Thread.java:479)
Traceback (innermost last):
  (no code object) at line 0
AttributeError: class 'Hello' has no attribute 'Hello'

Thanks to everyone that is taking the time to check into this.

Best regards.
--
Eduardo J. Fernandez Corrales

>>> "Robert W. Bill" <rb...@di...> 13/03/01 17:35 >>>
On Tue, 13 Mar 2001, brian zimmer wrote:
> Robert,
>=20
> This works for you?  Don't you need to add 'self' to the doGet()=20
> method?  It's an instance method, no?

YES!  Thank you.  Typing changes in reply instead of copy/paste=20
from the servlet was just error prone.  Sooo
sorry about that.  Brian is right, it must have self as first
parameter to method. =20

Robert

RE: [Jython-users] compiled servlet does not run

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

On Tue, 13 Mar 2001, brian zimmer wrote:
> Robert,
> 
> This works for you?  Don't you need to add 'self' to the doGet() 
> method?  It's an instance method, no?

YES!  Thank you.  Typing changes in reply instead of copy/paste 
from the servlet was just error prone.  Sooo
sorry about that.  Brian is right, it must have self as first
parameter to method.  

Robert

> At 09:07 AM 3/13/2001 -0600, Robert W. Bill wrote:
> 
> 
> >On Tue, 13 Mar 2001, Eduardo Jesus Fernandez Corrales wrote:
> > >
> > > Sure, there it goes.
> > >
> > > I am posting the generated file too, in case someone wants to check if 
> > it runs.
> >
> >"*" in import, Hmmmmmm.  I tried the following with success...
> >
> >
> >#spare imports removed and "*" replace with explicit package name
> >from javax.servlet import http
> >
> ># prefix superclass with explicit package name "http."
> >class Hello(http.HttpServlet):
> >     def doGet(req, res):
> >         res.setContentType("text/html")
> >         out = res.getWriter()
> >         out.println("<html><head><title>Hello World!</title></head>")
> >         out.println("<body><h1>Hello World!</h1></body></html>")
> >
> >
> >Another suspicion is the classpath when you compile.  Last I checked, you
> >can compile something like above _without_  javax.servlet in the
> >classpath and with no compile errors.  However, at runtime you get a NPE,
> >so you need to make sure javax.servlet.*... is in the classpath rather
> >than relying on compile time errors to remind you  (I don't remember the
> >original post though, so this may not apply.)
> >
> >
> > > >>> "brian zimmer" <bz...@zi...> 13/03/01 14:10 >>>
> > > >It's hard to tell without the servlet file, but make sure the file 
> > Hello.py
> > > >has a single class called 'Hello' that extends from HttpServlet:
> >
> >I think there can be more than one class.  If you have multiple classes
> >in the file, the servlet class (the subclass of HttpServlet) should be the
> >same name as the file.
> >
> >Cheers,
> >Robert
> >
> >
> >
> >
> >_______________________________________________
> >Jython-users mailing list
> >Jyt...@li...
> >http://lists.sourceforge.net/lists/listinfo/jython-users
> 

RE: [Jython-users] whichdb indeed!

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

Since you are using Jython can I suggest using Java serialization?  It is a
little more verbose that shelve but is fairly straightforward.  This is not
an answer to your original question but an alternative.

Mick 

-----Original Message-----
From: John Hethcox
To: jyt...@li...
Sent: 3/13/01 12:53 AM
Subject: [Jython-users] whichdb indeed!

All,
    The following script runs in python, but not jython:

import shelve
subd = { "hula":"hoop", "sevenof":9 }
d = shelve.open( "dictfile" )
d["hoop"] = "skirt"
d["polo"] = "pony"
d["subber"] = subd
d.close()
d = shelve.open( "dictfile" )
print d["subber"]

This is the output from the jython run:

jython.bat shelvetest.py
Traceback (innermost last):
  File "shelvetest.py", line 4, in ?
  File "e:\Jython\Lib\shelve.py", line 157, in open
  File "e:\Jython\Lib\shelve.py", line 147, in __init__
  File "e:\Jython\Lib\anydbm.py", line 71, in open
ImportError: no module named whichdb


whichdb.py is not in the the jython distribution so I borrowed the one
from python. That
eventually led to other problems (which I omit here). What is the best
strategy for getting
shelve to work?
Thanks (again)
John

 <<Card for John Hethcox>> 

RE: [Jython-users] compiled servlet does not run

[Eduardo J. F. C. <EFE...@sa...>]

Robert,

I have tried with your code and it still does not work.

The same happens with the code sent by Brian Zimmer.

That is: the servlet just hangs there doing nothing and the apache error =
log shows the same error that I sent in the first message in this thread.

However with your code I don't get the deprecation warning I got before.

Also I have checked and servlet.jar (which contains javax.servlet) is in =
the classpath and in the Jserv wrapper.classpath.

Best regards and thanks for your help.
--
Eduardo J. Fernandez Corrales

>>> "Robert W. Bill" <rb...@di...> 13/03/01 16:07 >>>


On Tue, 13 Mar 2001, Eduardo Jesus Fernandez Corrales wrote:
>
> Sure, there it goes.
>
> I am posting the generated file too, in case someone wants to check if =
it runs.

"*" in import, Hmmmmmm.  I tried the following with success...


#spare imports removed and "*" replace with explicit package name
from javax.servlet import http

# prefix superclass with explicit package name "http."
class Hello(http.HttpServlet):
    def doGet(req, res):
        res.setContentType("text/html")
        out =3D res.getWriter()
        out.println("<html><head><title>Hello World!</title></head>")
        out.println("<body><h1>Hello World!</h1></body></html>")


Another suspicion is the classpath when you compile.  Last I checked, you
can compile something like above _without_  javax.servlet in the
classpath and with no compile errors.  However, at runtime you get a NPE,
so you need to make sure javax.servlet.*... is in the classpath rather
than relying on compile time errors to remind you  (I don't remember the
original post though, so this may not apply.)


> >>> "brian zimmer" <bz...@zi...> 13/03/01 14:10 >>>
> >It's hard to tell without the servlet file, but make sure the file =
Hello.py
> >has a single class called 'Hello' that extends from HttpServlet:

I think there can be more than one class.  If you have multiple classes
in the file, the servlet class (the subclass of HttpServlet) should be the
same name as the file.

Cheers,
Robert




_______________________________________________
Jython-users mailing list
Jyt...@li...=20
http://lists.sourceforge.net/lists/listinfo/jython-users

RE: [Jython-users] compiled servlet does not run

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

Robert,

This works for you?  Don't you need to add 'self' to the doGet() 
method?  It's an instance method, no?

brian

At 09:07 AM 3/13/2001 -0600, Robert W. Bill wrote:


>On Tue, 13 Mar 2001, Eduardo Jesus Fernandez Corrales wrote:
> >
> > Sure, there it goes.
> >
> > I am posting the generated file too, in case someone wants to check if 
> it runs.
>
>"*" in import, Hmmmmmm.  I tried the following with success...
>
>
>#spare imports removed and "*" replace with explicit package name
>from javax.servlet import http
>
># prefix superclass with explicit package name "http."
>class Hello(http.HttpServlet):
>     def doGet(req, res):
>         res.setContentType("text/html")
>         out = res.getWriter()
>         out.println("<html><head><title>Hello World!</title></head>")
>         out.println("<body><h1>Hello World!</h1></body></html>")
>
>
>Another suspicion is the classpath when you compile.  Last I checked, you
>can compile something like above _without_  javax.servlet in the
>classpath and with no compile errors.  However, at runtime you get a NPE,
>so you need to make sure javax.servlet.*... is in the classpath rather
>than relying on compile time errors to remind you  (I don't remember the
>original post though, so this may not apply.)
>
>
> > >>> "brian zimmer" <bz...@zi...> 13/03/01 14:10 >>>
> > >It's hard to tell without the servlet file, but make sure the file 
> Hello.py
> > >has a single class called 'Hello' that extends from HttpServlet:
>
>I think there can be more than one class.  If you have multiple classes
>in the file, the servlet class (the subclass of HttpServlet) should be the
>same name as the file.
>
>Cheers,
>Robert
>
>
>
>
>_______________________________________________
>Jython-users mailing list
>Jyt...@li...
>http://lists.sourceforge.net/lists/listinfo/jython-users

RE: [Jython-users] compiled servlet does not run

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

On Tue, 13 Mar 2001, Eduardo Jesus Fernandez Corrales wrote:
>
> Sure, there it goes.
>
> I am posting the generated file too, in case someone wants to check if it runs.

"*" in import, Hmmmmmm.  I tried the following with success...


#spare imports removed and "*" replace with explicit package name
from javax.servlet import http

# prefix superclass with explicit package name "http."
class Hello(http.HttpServlet):
    def doGet(req, res):
        res.setContentType("text/html")
        out = res.getWriter()
        out.println("<html><head><title>Hello World!</title></head>")
        out.println("<body><h1>Hello World!</h1></body></html>")


Another suspicion is the classpath when you compile.  Last I checked, you
can compile something like above _without_  javax.servlet in the
classpath and with no compile errors.  However, at runtime you get a NPE,
so you need to make sure javax.servlet.*... is in the classpath rather
than relying on compile time errors to remind you  (I don't remember the
original post though, so this may not apply.)


> >>> "brian zimmer" <bz...@zi...> 13/03/01 14:10 >>>
> >It's hard to tell without the servlet file, but make sure the file Hello.py
> >has a single class called 'Hello' that extends from HttpServlet:

I think there can be more than one class.  If you have multiple classes
in the file, the servlet class (the subclass of HttpServlet) should be the
same name as the file.

Cheers,
Robert

RE: [Jython-users] compiled servlet does not run

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

This works for me:

#from javax.servlet import *
from javax.servlet.http import HttpServlet
#from java.io import *

class Hello(HttpServlet):
     def doGet(self, req, res):
         res.setContentType("text/html")
         out =3D res.getWriter()
         out.println("<html><head><title>Hello World!</title></head>")
         out.println("<body><h1>Hello World!</h1></body></html>")

Notice I added 'self' to doGet() as it's an instance method.  Also, be=20
careful with the
from xx import * notation as it's not really recommended.  Save all this in=
=20
a file called
Hello.py and it should work.

brian

At 03:14 PM 3/13/2001 +0100, Eduardo Jesus Fernandez Corrales wrote:

>Sure, there it goes.
>
>I am posting the generated file too, in case someone wants to check if it=
=20
>runs.
>
>Thanks.
>
> >
> >>> "brian zimmer" <bz...@zi...> 13/03/01 14:10 >>>
> >It's hard to tell without the servlet file, but make sure the file=
 Hello.py
> >has a single class called 'Hello' that extends from HttpServlet:
> >
> >class Hello(HttpServlet):
> >  ...
> >
> >Could you post the servlet code as this would help tremendously.
> >
> >hope this helps,
> >
> >brian
>
>--
>Eduardo J. Fern=E1ndez Corrales
>
>

RE: [Jython-users] compiled servlet does not run

[Eduardo J. F. C. <EFE...@sa...>]

Sure, there it goes.

I am posting the generated file too, in case someone wants to check if it =
runs.

Thanks.

>
>>> "brian zimmer" <bz...@zi...> 13/03/01 14:10 >>>
>It's hard to tell without the servlet file, but make sure the file =
Hello.py
>has a single class called 'Hello' that extends from HttpServlet:
>
>class Hello(HttpServlet):
>  ...
>
>Could you post the servlet code as this would help tremendously.
>
>hope this helps,
>
>brian

--
Eduardo J. Fern=E1ndez Corrales

RE: [Jython-users] compiled servlet does not run

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

It's hard to tell without the servlet file, but make sure the file Hello.=
py
has a single class called 'Hello' that extends from HttpServlet:

class Hello(HttpServlet):
  ...

Could you post the servlet code as this would help tremendously.

hope this helps,

brian

> -----Original Message-----
> From: jyt...@li...
> [mailto:jyt...@li...]On Behalf Of Eduardo
> Jesus Fernandez Corrales
> Sent: Tuesday, March 13, 2001 3:43 AM
> To: jyt...@li...
> Subject: [Jython-users] compiled servlet does not run
>
>
> Hello everyone:
>
> I am trying to run a compiled servlet written in Jython. Here's
> what I have done
>
> - I have installed Jython 2.0 in windows NT workstation with
> servicepack 6, using java 1.2.2
> - Wrote the servlet in file Hello.py. This is the usual simple
> servlet that just prints hello world
> - Compiled the servlet with jythonc. I get some deprecation
> warnings but the Hello.class file gets generated.
> - Moved the .class to the servlet directory (Other servlets like
> IsItWorkign run fine. This is Apache 1.3.6 with Jserv 1.0)
> - Tried to run the servlet. The browser just hangs there and I
> get a timeout
>
> Looking at the apache logs I get this in the error.log file:
>
> Java Traceback:
>
> 	at org.python.core.Py.AttributeError(Py.java:90)
> 	at org.python.core.PyObject.__getattr__(PyObject.java:672)
> 	at org.python.core.Py.initProxy(Py.java, Compiled Code)
> 	at Hello.<init>(Hello.java:141)
> 	at java.lang.Class.newInstance0(Native Method)
> 	at java.lang.Class.newInstance(Class.java, Compiled Code)
> 	at
> org.apache.jserv.JServServletManager.load_init(JServServletManager.java=
)
> 	at
> org.apache.jserv.JServServletManager.loadServlet(JServServletManager.ja=
va)
> 	at
> org.apache.jserv.JServConnection.processRequest(JServConnection.java)
> 	at org.apache.jserv.JServConnection.run(JServConnection.java)
> 	at java.lang.Thread.run(Thread.java:479)
> Traceback (innermost last):
>   (no code object) at line 0
> AttributeError: class 'Hello' has no attribute 'Hello'
>
> What could be the problem?
>
> Thanks in advance.
>
>
> --
> Eduardo J. Fern=E1ndez Corrales
>
>
> _______________________________________________
> Jython-users mailing list
> Jyt...@li...
> http://lists.sourceforge.net/lists/listinfo/jython-users

[Jython-users] compiled servlet does not run

[Eduardo J. F. C. <EFE...@sa...>]

Hello everyone:

I am trying to run a compiled servlet written in Jython. Here's what I =
have done

- I have installed Jython 2.0 in windows NT workstation with servicepack =
6, using java 1.2.2
- Wrote the servlet in file Hello.py. This is the usual simple servlet =
that just prints hello world
- Compiled the servlet with jythonc. I get some deprecation warnings but =
the Hello.class file gets generated.
- Moved the .class to the servlet directory (Other servlets like IsItWorkig=
n run fine. This is Apache 1.3.6 with Jserv 1.0)
- Tried to run the servlet. The browser just hangs there and I get a =
timeout

Looking at the apache logs I get this in the error.log file:

Java Traceback:

	at org.python.core.Py.AttributeError(Py.java:90)
	at org.python.core.PyObject.__getattr__(PyObject.java:672)
	at org.python.core.Py.initProxy(Py.java, Compiled Code)
	at Hello.<init>(Hello.java:141)
	at java.lang.Class.newInstance0(Native Method)
	at java.lang.Class.newInstance(Class.java, Compiled Code)
	at org.apache.jserv.JServServletManager.load_init(JServServletManag=
er.java)
	at org.apache.jserv.JServServletManager.loadServlet(JServServletMan=
ager.java)
	at org.apache.jserv.JServConnection.processRequest(JServConnection.=
java)
	at org.apache.jserv.JServConnection.run(JServConnection.java)
	at java.lang.Thread.run(Thread.java:479)
Traceback (innermost last):
  (no code object) at line 0
AttributeError: class 'Hello' has no attribute 'Hello'

What could be the problem?

Thanks in advance.


--
Eduardo J. Fern=E1ndez Corrales

[Jython-users] whichdb indeed!

[John H. <jo...@ne...>]

All,
    The following script runs in python, but not jython:

import shelve
subd = { "hula":"hoop", "sevenof":9 }
d = shelve.open( "dictfile" )
d["hoop"] = "skirt"
d["polo"] = "pony"
d["subber"] = subd
d.close()
d = shelve.open( "dictfile" )
print d["subber"]

This is the output from the jython run:

jython.bat shelvetest.py
Traceback (innermost last):
  File "shelvetest.py", line 4, in ?
  File "e:\Jython\Lib\shelve.py", line 157, in open
  File "e:\Jython\Lib\shelve.py", line 147, in __init__
  File "e:\Jython\Lib\anydbm.py", line 71, in open
ImportError: no module named whichdb


whichdb.py is not in the the jython distribution so I borrowed the one
from python. That
eventually led to other problems (which I omit here). What is the best
strategy for getting
shelve to work?
Thanks (again)
John

[Jython-users] casting

[Benjamin C. <bc...@cs...>]

So, say I've got a java class A, and a "subclass" B done in jython. Should
I be able to do the following in a java program:

A a = null;
Class c (previously initialized to have an instance of B);

a = (A) c.newInstance();

If not, why not?

Thanks
Ben

RE: [Jython-users] DnD in Jython (attached source code)

[syKim <re...@ne...>]

Sorry.. I forgot that attach file. :)

RE: [Jython-users] DnD in Jython

[syKim <re...@ne...>]

Thank you for your regard, Ype

I attached simple DnD source in java.

It just display .txt, .java file in EditBox

but, I guess it's nice example.

then, make reference to this site...

http://java.sun.com/products/javabeans/glasgow/dnd.pdf  : Proposal for a DnD
subsystem for JFC

http://java.sun.com/j2se/1.3/docs/api/java/awt/dnd/package-summary.html :
java.awt.dnd package description

I expect good news..

Happy Python :)