[Jython-dev] Deploying app in jar file

[Dave K. <dku...@re...>]

I have some questions about the use of jar files with jython.

I'm using jython 2.2.1rc1.

Suppose I copy jython.jar:

    $ cp ../jython2.2.1rc1/jython.jar application.jar

Suppose testfuture.py contains:

    # testfuture.py

    #from __future__ import generators

    import sys
    print 'sys.version:', sys.version
    print 'sys.path:', sys.path

Then I run:

    $ java -jar application.jar testfuture.py
    *sys-package-mgr*: can't create package cache dir, '/home/dkuhlman/a1/
    Python/Jython/Test/application.jar/cachedir/packages'
    sys.version: 2.2.1rc1
    sys.path: ['', '/home/dkuhlman/a1/Python/Jython/Test/application.jar/Lib',
    '__classpath__']

Good.

Now I uncomment the import from __future__, then run it again and I see:

    $ java -jar application.jar testfuture.py
    *sys-package-mgr*: can't create package cache dir, '/home/dkuhlman/a1/
    Python/Jython/Test/application.jar/cachedir/packages'
    Traceback (innermost last):
      File "testfuture.py", line 2, in ?
    ImportError: no module named __future__

And, if I rename testfuture.py to __run__.py and add it at the root of 
application.jar, then run jython instead of java, I see the following:

    ~/a1/Python/Jython/Test [145] jython -jar application.jar
    sys.version: 2.2.1rc1
    sys.path: ['', '/home/dkuhlman/a1/Python/Jython/jython2.2.1rc1/Lib',
    '__classpath__']

The __future__ error has gone away.  But, sys.path is now wrong.  It should 
contain '/home/dkuhlman/a1/Python/Jython/Test/application.jar/Lib' as before, 
shouldn't it?

It seems to me that there is a bug there.  But, I'm unsure, because I do not 
know what java/jython is supposed to do or is trying to do.

I've come across the above in trying to use Greg Moore's article on 
distributing Jython applications at: 

  http://wiki.python.org/jython/JythonFaq/DistributingJythonScripts

Am I trying to do something that I should not be doing?  If so, how do I deploy 
an application in a jar file?

Dave