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

[Alexey N. S. <A.S...@md...>]

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/
/