The Java jar file must be in the CLASSPATH (as I described in my previous
posting) in order for Jython 2.1 (which is what STAX uses) to be able to
load classes from it through the underlying JVM. Using the
sys.path.append() is for adding Jython/Python modules that you are going
to import (it doesn't update the CLASSPATH so it cannot be used to add
Java jar file to the CLASSPATH in Jython 2.1). Note that in Jython 2.2.1
and later there are some improvements in how Java classes can be loaded.
We plan to update STAX sometime next year to use a later version of
Jython.
Here's another way you can load a Java jar file that works with STAX and
Jython 2.1 and doesn't require the classpath to be updated when
registering the STAX service. I put the code to load a jar file in a
separate STAX function in this sample job. Then you can include this
'loadJar' STAX function in your STAX job and then update your STAX job to
call the 'loadJar' function specifying the location of your jar file
before importing classes from the jar file.
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE stax SYSTEM "stax.dtd">
<stax>
<defaultcall function="main"/>
<function name="main">
<sequence>
<!-- Must load the jar file before importing classes from it -->
<call function="'loadJar'">'C:\\testing\\Desktop\\jniwrap-2.9.5.jar'
</call>
<script>
# Now import your Java classes that are in this jar file
</script>
</sequence>
</function>
<function name="loadJar" scope="local">
<function-prolog>
Dynamically loads a jar file so that claases can then be imported
from it.
</function-prolog>
<function-single-arg>
<function-required-arg name="jarfile">
A string with the fully qualified path name of the jar you want to
import
</function-required-arg>
</function-single-arg>
<sequence>
<script>
#import all the references we'll need
from org.python.core import Py,PySystemState
from java.net import URLClassLoader,URL
from java.io import File
import jarray
# Add jar file to the package manager
PySystemState.packageManager.addJar(jarfile, 0);
# Now we need to add our own class loader to the system
# Get the old class loader
systemState = Py.getSystemState()
oldClassLoader = systemState.getClassLoader()
# Use the one loading the jython classes if the system state
instance returns None
if not oldClassLoader:
oldClassLoader = Py.getClassLoader()
jarurl = File(jarfile).toURI().toURL()
urlArray = jarray.array([jarurl],URL)
newClassLoader = URLClassLoader(urlArray,oldClassLoader)
systemState.setClassLoader(newClassLoader)
</script>
</sequence>
</function>
</stax>
--------------------------------------------------------------
Sharon Lucas
IBM Austin, [EMAIL PROTECTED]
(512) 838-8347 or Tieline 678-8347
[EMAIL PROTECTED]
11/11/2008 11:11 AM
To
Sharon Lucas/Austin/[EMAIL PROTECTED]
cc
staf-users@lists.sourceforge.net
Subject
Re: [staf-users] Unable to call Java and Jython from Stax xml Job
On Tue, Nov 11, 2008 at 3:13 PM, Sharon Lucas <[EMAIL PROTECTED]> wrote:
Please provide your STAX xml file that contains exactly what you're doing,
as well as your .py file and Java class files so I can try to recreate and
resolve the problem.
--------------------------------------------------------------
Sharon Lucas
IBM Austin, [EMAIL PROTECTED]
(512) 838-8347 or Tieline 678-8347
[EMAIL PROTECTED]
11/11/2008 04:29 AM
To
Sharon Lucas/Austin/[EMAIL PROTECTED]
cc
staf-users@lists.sourceforge.net
Subject
Re: [staf-users] Unable to call Java and Jython from Stax xml Job
Dear Sharon,
Thanks for the mail.
I just resolved the problem with your help you did to me earlier and a bit
by adding to the STAF's CLASSPATH environment variable the path to one of
my .jar file which my Jython and Java classes use:
import sys
sys.path.append("C:\\testing")
Thanks for your kind help.
I also wonder the why STAF wasn't able to load the classes from the Jar
file when I actually added the path in my xml file by:
sys.path.append("C:\\testing\\Desktop\\jniwrap-2.9.5.jar")
Ultimately, I had to add this to the STAF Env variable CLASS PATH in the
STAF.cfg file.
Regards,
Rajat
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