On Tue, Nov 11, 2008 at 5:49 PM, Sharon Lucas <[EMAIL PROTECTED]> wrote:
>
> 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>
>
> Dear Sharon,
Thanks again and again for helping me by stretching yourself to such an
extent.
I'll give this a try and get back to you in case I face any problem.
Thanks so much.
Cheers,
Rajat
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