Re: [Jython-users] Generated java classes dependency

[Ben H. <Ben...@fi...>]

The stack trace shows that the jython library was present. Consider the
evidence:

> java.lang.ExceptionInInitializerError: java.lang.NullPointerException
>         at org.python.modules.os.<clinit>(os.java:11)

ExceptionInInitializerError means that some code running when the 'os' class
loaded into the JVM, (possibly in a "static{}" code block), threw a null
pointer exception.

The code is on line 11 of os.java, which is included in your distribution,
so you can look at the file and get an exact answer to what failed and why.

Ben
----- Original Message -----
From: "Garcia, Michael" <mg...@Bu...>
To: "'DITTGEN Pierre '" <pie...@cr...>;
<jyt...@li...>
Sent: Tuesday, April 03, 2001 3:23 PM
Subject: RE: [Jython-users] Generated java classes dependency


> Hi Pierre,
> I believe you are correct.  You must have the jython.jar on your delivery
> platform.  This is not unlike trying to write servlets or some other java
> app.  You need to have the supporting libs on the system it will run on.
>
> The jython app you are delivering is dependent on the jython distribution.
> Would it be possible to distribute jython with you jar?
>
> regards,
> Mick
>
> -----Original Message-----
> From: DITTGEN Pierre
> To: jyt...@li...
> Sent: 3/30/01 7:26 AM
> Subject: [Jython-users] Generated java classes dependency
>
> 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
>
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