Re: [Jython-users] Classpath/Classloader issue with Jython invoked vi a Tomcat/Velocity

[Travis B. <tb...@my...>]

Alexey,

For this webapp, jython.jar is installed in 
$CATALINA_HOME/webapps/$WEBAPP_NAME/WEB-INF/lib/

If you are correct, is there a recommended way to override the 
classloader with one of my choosing?


Thanks!


-Travis


On Jan 31, 2005, at 2:55 PM, Alexey N. Solofnenko wrote:

>  I think it indicates that your code is loaded by another (global?) 
> class loader. Where do you have Jython jar installed?
>
>  - Alexey.
>
>  Travis Bear wrote:
> I'm really puzzled by an issue I'm seeing running Jython.  I've 
> compiled
> my scripts with jythonc into java class files.  These scripts import
> some classes from external jar files.  From the command line, 
> everything
> runs just fine.  However, when I invoke the Jython scripts  from inside
> Tomcat, they break because they can't locate any of the packages I try
> to import from.  The puzzling part is that other (non-Jython) code in 
> my
> webapp imports the same pacakges just fine, and it's all running in the
> same VM.
>
> Here is the Jython script Setup.py:
>
> print "Entering Setup"
>
> from org.jtmb.sql import DataEngine
> from java.io import File
>
> propsFile = File("conf/DataEngine.properties")
> de = DataEngine.getStaticInstance(propsFile)
> print de.getString("select version as name from branch")
>
> Here is the code from the Velocity context where I statically invoke 
> the
> jython script:
>
> com.myrio.setup.Setup.main(new String[]{});
>
> Here's an alternate effort in the Velocity context where I try to
> explicitly use the same classloader:
>
>     ClassLoader loader = this.getClass().getClassLoader();
>     Object setup = Class.forName("com.myrio.setup.Setup", true,
> loader).newInstance();
>     logger.fatal ("Attempting to load setup with custom classloader");
>     ((com.myrio.setup.Setup) setup).main(new String[]{});
>
>
> In both cases, I get the same result.  Here's the output in
> catalina.out.
>
> Entering Setup
> Traceback (innermost last):
>   File "/home/travis/p4/3.5/qa/qas/code/jython/Setup.py", line 0, in
> main
> ImportError: No module named jtmb
>
>
>
> Thanks in advance -- this is my first effort at using classloaders, so 
> I
> could easily be missing something.  I'm pretty sure I could get it to
> work by manually setting the classpath via system properties.  But that
> seems like a pretty broken approach.  Any help is appreciated!
>
>
> -Travis
>
>
>
>
>  --
>
>  Alexey N. Solofnenko
>  home: http://trelony.cjb.net/
>
>  _________________________________________________ Scanned on 31 Jan 
> 2005 22:57:33