[Jepp-users] .JepException: <type 'exceptions.ImportError'> undefined symbol error

[John P <joh...@gm...>]

I know this sort of problem has been addressed in other threads but can't
quite figure out how to get around it for my case.

I can use jep to open a python module and run functions in that module.
However, the entire reason that I'm using jep is to have access to numpy and
scipy.  When I try to import numpy or scipy from my python module I get this
error:

java -Djava.library.path=. -jar jeptest.jar
Exception in thread "main" jep.JepException: <type
'exceptions.ImportError'>:
/usr/lib/python2.6/dist-packages/numpy/core/multiarray.so: undefined symbol:
_Py_ZeroStruct
        at jep.Jep.run(Native Method)
        at jep.Jep.runScript(Jep.java:191)
        at jep.Jep.runScript(Jep.java:167)
        at jeptest.runme$.main(jeptest.scala:17)
        at jeptest.runme.main(jeptest.scala)

Here are the steps I've taken:
fresh install of Ubuntu 11.04
installed (using apt-get install python-numpy python-scipy) both numpy and
scipy (python2.6 was already loaded on the instance)
apt-get install sun-java6-jdk
export JAVA_HOME=/usr/lib/jvm/java-6-sun
sudo apt-get install python2.6-dev
downloaded jep-2.4.tar.gz
ran autoconf/configure/make/make install
copied my libjeb.so to the folder I was running the jar from

Please note the " -Djava.library.path=." in my command-line call to java.

As explained in http://jepp.sourceforge.net/usage.html#tomcat, I think I
somehow also have to set LD_PRELOAD and LD_LIBRARY_PATH.  But I have no clue
what to set them to. In addition, I will be running this jar on a hadoop
cluster, so I will have to programmatically set both those environmental
variables.

So my questions are:
1. Will setting  LD_PRELOAD and LD_LIBRARY_PATH allow my python script to
successfully import & use numpy and scipy?
2. How do I determine the correct values for and set  LD_PRELOAD and
LD_LIBRARY_PATH programmatically from inside the jar that is going to
instantiate jep?
3. If (2) isn't possible, what is my alternative?
4. I'm using " -Djava.library.path=." in my command-line java call.  This
seems wrong to me, since I would think the current directory would be
included in the java library path to begin with.  (I realize that this is
more of java question than a jep question, but I figured that anyone
answering the previous questions could shed some light on why/why not/how I
should be using java.library.path correctly).

Thanks in advance for your help!