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

[Mike J. <mrj...@gm...>]

Hi,

I'm going to be out until Tuesday, but it looks like you do need to set the
LD_PRELOAD variable to make sure the native libraries are loaded correctly
from Python. LD_LIBRARY_PATH is only really needed if you install outside of
a normal lib folder indexed by ld.

With hadoop, you probably just need to add export to the start script.

Thanks,
Mike

Sent from my mobile
On Jul 15, 2011 8:51 AM, "John P" <joh...@gm...> wrote:
> 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!