[Jython-users] Generated java classes dependency

[DITTGEN P. <pie...@cr...>]

Hello,

I'm quite new to jython, i find it very powerful as a script language.
But at this time, I have a problem to make an independant jar from a jython
script.
I use Jython 2.0, with SUN JDK1.3.0 on Win2000 Pro.

My script is called dir.py and contains:
== begin ======
import os

for file in os.listdir('.'):
	print file
== end ========

It works well as I use the command line:
jython dir.py
(it shows me the list of the files of the current directory)

I want to build a jar file from this script.
I used this command :
jythonc -a -j dir.jar dir.py
It created a jar file (called dir.jar) which contains normally all the
needed jython libraries
needed to make it run.
But as I want to run it, using the command
java -jar dir.jar
I got an exception :
== begin ==============
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.Py.runMain(Py.java:798)
        at dir.main(dir.java:61)
Traceback (innermost last):
  File "C:\Documents\src\jython\test\dir.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.__getattr__(PyObject.java:670)
        at dir$_PyInner.main$1(dir.java:43)
        at dir$_PyInner.call_function(dir.java:28)
        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 dir.main(dir.java:61)

java.lang.ExceptionInInitializerError: java.lang.ExceptionInInitializerError
== end ================

I solved the problem giving the root dir of jython installation as a system
property:
java -Dpython.home=c:\dev\jython-2.0 -jar dir.jar

But it annoys me...
Is the generated jar (dir.jar) still dependant of the jython installation ?
Does it mean that it can't run on a workstation having only JRE installed ?
If not, please help me to find out the thing or the option I missed.

Thanks
Pierre
-- 
Pierre Dittgen, software engineer
CRIL Telecom software
E-mail: pie...@cr...
Phone: (33) 1 58 17 04 64